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DD 250-CA

Original operating instructions

Information about the documentation

About this documentation

  • Read this documentation before initial operation or use. This is a prerequisite for safe, trouble-free handling and use of the product.
  • Observe the safety instructions and warnings in this documentation and on the product.
  • Always keep the operating instructions with the product and make sure that the operating instructions are with the product when it is given to other persons.

Explanation of symbols used

Warnings

Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used:
DANGER
DANGER !
  • Draws attention to imminent danger that will lead to serious personal injury or fatality.
WARNING
WARNING !
  • Draws attention to a potential threat of danger that can lead to serious injury or fatality.
CAUTION
CAUTION !
  • Draws attention to a potentially dangerous situation that could lead to personal injury or damage to the equipment or other property.

Symbols in the documentation

The following symbols are used in this document:
Image alternative Read the operating instructions before use.
Image alternative Instructions for use and other useful information
Image alternative Dealing with recyclable materials
Image alternative Do not dispose of electric equipment and batteries as household waste

Symbols in the illustrations

The following symbols are used in illustrations:
Image alternative These numbers refer to the corresponding illustrations found at the beginning of these operating instructions
Image alternative The numbering reflects the sequence of operations shown in the illustrations and may deviate from the steps described in the text
Image alternative Item reference numbers are used in the overview illustrations and refer to the numbers used in the product overview section
Image alternative This symbol is intended to draw special attention to certain points when handling the product.

Product-dependent symbols

"Must do" symbols

The following "must do" symbols are used:
Image alternative Wear eye protection
Image alternative Wear a hard hat
Image alternative Wear ear protection
Image alternative Wear protective gloves
Image alternative Wear protective footwear
Image alternative Wear light respiratory protection

Symbols on the product

The following symbols can be used on the product:
Image alternative Analysis data
Image alternative Hole-starting mode
Image alternative Rated speed under no load
Image alternative Alternating current
Image alternative Diameter
Image alternative Do not transport by crane
Image alternative Bluetooth
Image alternative Locking mechanism opened
Image alternative Locking mechanism closed
Image alternative The product supports wireless data transmission compatible with iOS and Android platforms.
Image alternative Protective ground
Image alternative If applied on the product, the product has been certified by this certification body for the US and Canadian markets according to the applicable standards.

Information notices

On the drill stand, base plate or diamond core drilling machine
Image alternative On the vacuum base plate
Upper half of the image : An additional means of securing the drill stand must be employed when the machine is used for horizontal drilling with the vacuum securing method.
Lower half of the image : Use of the vacuum securing method without an additional means of securing is prohibited for drilling in an upward direction.
Image alternative On the diamond core drilling machine
Use of the water collection system in conjunction with a wet-type industrial vacuum extractor is a mandatory requirement for working overhead.
Image alternative On the diamond core drilling machine
Operate the system only with a fully functional PRCD.

Product information

Image alternative products are designed for professional users and only trained, authorized personnel are permitted to operate, service and maintain the products. This personnel must be specifically informed about the possible hazards. The product and its ancillary equipment can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use.
The type designation and serial number are printed on the rating plate.
  • Write down the serial number in the table below. You will be required to state the product details when contacting Hilti Service or your local Hilti organization to inquire about the product.
    Product information
    Diamond core drilling machine
    DD 250-CA
    Generation
    01
    Serial no.

Safety

General power tool safety warnings

Image alternative WARNING Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Work area safety
  • Keep work area clean and well lit. Cluttered or dark areas invite accidents.
  • Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
  • Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
Electrical safety
  • Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
  • Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
  • Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
  • Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.
  • When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
  • If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.
Personal safety
  • Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.
  • Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries.
  • Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power tools that have the switch on invites accidents.
  • Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
  • Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
  • Dress properly. Do not wear loose clothing or jewellery. Keep your hair and clothing away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
  • If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
  • Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
Power tool use and care
  • Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
  • Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
  • Disconnect the plug from the power source and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
  • Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
  • Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
  • Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
  • Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
  • Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
Service
  • Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Drill safety warnings

Safety instructions for all operations
  • Hold the power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock.
Safety instructions when using long drill bits
  • Never operate at higher speed than the maximum speed rating of the drill bit. At higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the workpiece, resulting in personal injury.
  • Always start drilling at low speed and with the bit tip in contact with the workpiece. At higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the workpiece, resulting in personal injury.
  • Apply pressure only in direct line with the bit and do not apply excessive pressure. Bits can bend causing breakage or loss of control, resulting in personal injury.

Diamond drill safety warnings

  • When performing drilling that requires the use of water, route the water away from the operator’s work area or use a liquid collection device. Such precautionary measures keep the operator’s work area dry and reduce the risk of electrical shock.
  • Operate power tool by insulated grasping surfaces, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.
  • Wear hearing protection when diamond drilling. Exposure to noise can cause hearing loss.
  • When the bit is jammed, stop applying downward pressure and turn off the tool. Investigate and take corrective actions to eliminate the cause of the bit jamming.
  • When restarting a diamond drill in the workpiece check that the bit rotates freely before starting. If the bit is jammed, it may not start, may overload the tool, or may cause the diamond drill to release from the workpiece.
  • When securing the drill stand with anchors and fasteners to the workpiece, ensure that the anchoring used is capable of holding and restraining the machine during use. If the workpiece is weak or porous, the anchor may pull out causing the drill stand to release from the workpiece.
  • When securing the drill stand with a vacuum pad to the workpiece, install the pad on a smooth, clean, non-porous surface. Do not secure to laminated surfaces such as tiles and composite coating. If the workpiece is not smooth, flat or well affixed, the pad may pull away from the workpiece.
  • Ensure there is sufficient vacuum before and during drilling. If the vacuum is insufficient, the pad may release from the workpiece.
  • Never perform drilling with the machine secured by the vacuum pad only, except when drilling downwards. If the vacuum is lost, the pad will release from the workpiece.
  • When drilling through walls or ceilings, ensure to protect persons and the work area on the other side. The bit may extend through the hole or the core may fall out on the other side.
  • When drilling overhead, always use the liquid collection device specified in the instructions. Do not allow water to flow into the tool. Water entering the power tool will increase the risk of electric shock.

Additional safety instructions

Personal safety
  • Do not tamper with or attempt to make alterations to the machine.
  • The machine is not intended for use by debilitated persons who have received no special training.
  • Keep the machine out of reach of children.
  • Do not touch rotating parts. Switch the machine on only after it is in position at the workpiece. Touching rotating parts, especially rotating accessory tools, can result in injury.
  • Avoid skin contact with drilling slurry.
  • Dust from materials such as lead-based paint, certain types of wood and concrete/masonry/stone containing quartz, and minerals or metal can be harmful to health. Contact with or inhalation of the dust can cause allergic reactions and/or respiratory or other diseases among operators or bystanders. Certain kinds of dust such as oakwood and beechwood dust are classified as carcinogenic, especially in conjunction with additives for wood conditioning (chromate, wood preservative). Only specialists are permitted to handle material containing asbestos. Use as effective a dust removal system as possible. To achieve a high level of dust collection, use a suitable vacuum extractor of the type recommended by Hilti for wood dust and/or mineral dust and which is designed for use with this power tool. Make sure that the workplace is well ventilated. It is advisable to wear a dust mask appropriate for the type of dust generated. Comply with national regulations applicable to the materials you will be working with.
  • The diamond core drilling machine and the diamond core bit are heavy. There is a risk of crushing parts of the body. The user and persons in the vicinity must wear suitable protective goggles, a hard hat, ear defenders, protective gloves and protective footwear while the machine is in use.
Power tool use and care
  • Make sure that the machine is correctly secured to the drill stand.
  • Always make sure that an end stop is installed on the drill stand as otherwise the safety-relevant end-stop function is not implemented.
  • Check that accessory tools are compatible with the machine’s chuck/drive system and that they are installed and secured correctly.
Electrical safety
  • Do not use extension cords with multiple power outlets powering two or more devices in operation at the same time.
  • Operate the machine only when it is connected to an adequately rated power supply with a ground conductor.
  • Before beginning work, check the working area (e.g. using a metal detector) to ensure that no concealed electric cables or gas and water pipes are present. External metal parts of the machine can become live, for example if you inadvertently damage electric wiring. This constitutes a serious risk of electric shock.
  • Make sure that the supply cord cannot be damaged as the carriage advances.
  • Never operate the machine without the accompanying PRCD (machines without PRCD: Never operate the machine without an isolating transformer). Test the PRCD each time before use.
  • Check the machine’s supply cord at regular intervals and have it replaced by a qualified specialist if found to be damaged. If the machine’s supply cord is damaged it must be replaced with a specially prepared and approved supply cord available from Hilti Customer Service. Check extension cords at regular intervals and replace them if found to be damaged. Do not touch the supply cord or extension cord if it is damaged while working. Disconnect the supply cord plug from the power outlet. Damaged supply cords or extension cords present a risk of electric shock.
  • Never operate the machine when it is dirty or wet. Dust, especially dust from conductive materials, or dampness on the surface of the power tool can, under unfavorable conditions, lead to electric shock. Have dirtied or dusty power tools checked at regular intervals by Hilti Service, especially if they are used frequently for working on conductive materials.
  • Whenever you operate the diamond core drilling machine without DD AF-CA H, always install the cover over the AC supply for the DD AF-CA H. Water entering the power tool will increase the risk of electric shock.
Workplace
  • Approval must be obtained from the site engineer or architect prior to beginning drilling work. Drilling work on buildings and other structures may influence the static equilibrium of the structure, especially when steel reinforcing bars or load-bearing components are cut through.
  • If the drill stand has not been fastened correctly, always move the machine mounted on the drill stand all the way down in order to prevent the stand from falling over.
  • Keep the supply cord, extension cord, water hose and vacuum hose away from rotating parts of the machine.
  • Use of the water collection system in conjunction with a wet-type industrial vacuum extractor is a mandatory requirement for wet drilling overhead.
  • Use of the vacuum securing method without an additional means of fastening is prohibited for drilling in an upward direction.
  • An additional means of securing the drill stand must be employed when the machine is secured with the vacuum securing method (accessory) for horizontal drilling.

Description

Product overviews

Diamond core drilling machine DD 250-CA

Image alternative
  1. Multifunction display
  2. Hole-starting mode operating button
  3. Analysis data operating button
  4. Rating plate
  5. On/off switch
  6. Supply cord cover
  7. AC supply for DD AF-CA H (accessory)
  8. Supply cord with PRCD
  9. Water connection
  10. Carrying handle (2x)
  11. Carbon brush cover (2x)
  12. Water flow regulator
  13. Chuck
  14. Gear selector

Drill stand DD-HD 30

Image alternative
  1. Jack screw (accessory)
  2. Cover
  3. Rail
  4. Leveling screw (3x)
  5. Hole center indicator
  6. Anchor
  7. Base plate
  8. Rating plate
  9. Clamping spindle
  10. Clamping nut
  11. Brace
  12. Carrying handle
  13. End stop screw
  14. Depth gauge (accessory)
  15. Wheel assembly mount
  16. Water collector holder (accessory)
  17. Seal (accessory)
  18. Water collector (accessory)
  19. Sealing washer for water collector (accessory)

Carriage DD-HD 30

Image alternative
  1. Hand wheel sleeve 1:1
  2. Hand wheel sleeve 1:3
  3. Eccentric pin (for locking the diamond core drilling machine)
  4. Shear pin
  5. Hand wheel
  6. Leveling indicator (2x)
  7. Carriage lock
  8. Supply cord guide
  9. Adapter interface for DD AF-CA H
  10. Carriage play adjusting screw (4x)

Vacuum base plate (accessory)

Image alternative
  1. Vacuum release valve
  2. Vacuum hose connector
  3. Wheel assembly mount
  4. Pressure gauge
  5. Vacuum seal
  6. Leveling screw (4x)

Intended use

The product described is an electrically powered diamond core drilling machine. It is designed for the rig-based wet drilling of through-holes and blind holes in (reinforced) mineral materials. Hand-held use of the diamond core drilling machine is not permitted.

  • Always use a drill stand when using the diamond core drilling machine. The drill stand must be sufficiently anchored in the base material by an anchor base plate or vacuum base plate.

  • Do not use a hammer or other heavy object to adjustment the base plate.

  • Operate the tool only when it is connected to a power source providing a voltage and frequency in compliance with the information stated on the rating plate.

  • Comply with the safety rules and operating instructions for the accessories used.

Bluetooth®

This product has Bluetooth.
Bluetooth is a wireless data transfer system by which the two Bluetooth-enabled products can communicate with each other over a short distance.
To ensure a stable Bluetooth connection there must be a clear line of sight between the connected devices.
Bluetooth functions of this productConsult the operating instructions of the paired device for detailed descriptions of the Bluetooth functions.
  • Service and status messages of the paired Hilti devices are shown on the display of the diamond core drilling machine.
  • Connection with a mobile terminal device via the Hilti ON!Track 3 app for service functions and for transmission of product-related analysis data.
Switching Bluetooth on or off
Hilti products ship ex-works with Bluetooth deactivated. Bluetooth switches itself on automatically during initial operation.
  • To switch off, press and hold down the buttons Image alternative and Image alternative simultaneously for at least 10 seconds.
  • To switch on, press the buttons Image alternative and Image alternative simultaneously.
Connecting productsThe pairing with a Bluetooth-compatible Hilti device is sustained until the diamond core drilling machine is paired to another Hilti device of the same type or Bluetooth is switched off. Pairing is also sustained even when the products are switched off and then on again; paired products always automatically re-establish their paired connection.
  • To pair with a Bluetooth-compatible Hilti device or mobile device, with Bluetooth switched on simultaneously press the Image alternative and Image alternative buttons.
The time window for pairing with a Bluetooth-compatible Hilti device is 2 minutes. When the 2 minutes have expired, the connection process will be canceled.
License
The Bluetooth® word mark and the logo are registered trademarks and the property of Bluetooth SIG, Inc. and Hilti has been granted a license to use these trademarks.

Display symbols and explanation of the multifunction display on the diamond core drilling machine

For the following information to be displayed, the diamond core drilling machine must be ready for operation (plugged in and PRCD switched on).
The displays may vary depending on the gear selection and the type of application.
Image alternative
Start screen
The start screen is displayed when the diamond core drilling machine is supplied with power. The Bluetooth status, the personalized name and the serial number of the diamond core drilling machine are shown on the start screen.
  • You can change the product name that appears on the screen in the Hilti ON!Track 3 app (default: 'Your name here ').
Image alternative
Spirit level
The diamond core drilling machine is not switched on. The display helps you to level the system and to align the drill stand when drilling at an angle. The display shows the alignment of the diamond core drilling machine symbolically and in degrees.
  • Angular accuracy at room temperature: ±2°
Image alternative
Gear indicator
The diamond core drilling machine is running under no load. The display helps ensure that the gear engaged is suitable for the diamond core bit used. At top left, the display shows the gear engaged and in the center, the recommended core bit diameter range in millimeters and inches for this gear.
Image alternative
Hole-starting mode is active
The diamond core drilling machine is switched off or running under no load. This function makes it possible to start holes with low vibration when using large-diameter core bits. This function can be deactivated at any time by pressing the button Image alternative again.
  • This information is shown in the display only for a few seconds.
Image alternative
Remaining running time in hole-starting mode
The diamond core drilling machine is drilling and the hole-starting mode is active. The display shows the time remaining until the diamond core drilling machine automatically switches off.
  • To protect the diamond core drilling machine, hole-starting mode is switched off automatically after a maximum of 2 minutes.
    The reading subsequently disappears from the display.
Image alternative
Hole-starting mode deactivated
Hole-starting mode has been deactivated. Speed and power of the diamond core drilling machine increase and drilling can proceed
  • This information is shown in the display only for a few seconds.
Image alternative
Hole-starting mode cannot be activated
The diamond core drilling machine is drilling. The button for activating hole-starting mode was pressed while the diamond core drilling machine was under load or was in cool-down mode.
  • This information is shown in the display only for a few seconds.
Image alternative
Drilling performance indicator: Contact pressure is too low
The diamond core drilling machine is drilling and the hole-starting mode is not activated. The information displayed helps ensure that the diamond core drilling machine is being operated in the optimal range.
  • Background color: Yellow.
    Contact pressure is too low. Increase the contact pressure.
Image alternative
Drilling performance indicator: Optimum contact pressure
The diamond core drilling machine is drilling and the hole-starting mode is not active. The information displayed helps ensure that the diamond core drilling machine is being operated in the optimal range.
  • Background color: Green.
    Contact pressure is at the optimum level.
Image alternative
For 120 V
Rated current limit has been exceeded
The diamond core drilling machine is drilling and the hole-starting mode is not activated. Rated current has exceeded the limit of 20 A.
  • Contact pressure is too high. Reduce the contact pressure.
Image alternative
Drilling performance indicator: Contact pressure is too high
The diamond core drilling machine is drilling and the hole-starting mode is not activated. The information displayed helps ensure that the diamond core drilling machine is being operated in the optimal range.
  • Background color: Red.
    Contact pressure is too high. Reduce the contact pressure.
Image alternative
Status bar for information
The status bar displays various information regarding the machine’s current status, such as the gear engaged or the activated hole-starting mode.
Image alternative
Status bar for warning messages
The status bar displays various warnings regarding the tool's current status which do not result in the diamond core drilling machine stopping immediately.
Image alternative
Bluetooth ON
Bluetooth is activated in the basic setting.
To switch off the Bluetooth function, press and hold down the buttons Image alternative and Image alternative simultaneously for 10 seconds with the motor switched off.
  • This information is shown in the display only for a few seconds.
Image alternative
Bluetooth OFF
Bluetooth is deactivated. The diamond core drilling machine cannot be connected to additional device or accessories.
To switch on the Bluetooth function, press the buttons Image alternative and Image alternative simultaneously with the motor switched off.
  • This information is shown in the display only for a few seconds.
Image alternative
Connection has been established
The diamond core drilling machine is ready to connect to another device or accessory.
To start the process of establishing the connection, simultaneously press the Image alternative and Image alternative buttons and hold them down for at least 1 second.
  • The time frame for the connection to another device is 2 minutes. When the 2 minutes have expired, the connection process will be canceled.
The paired connection between another device or accessory and the diamond core drilling machine is sustained until:
  • The diamond core drilling machine is paired to a device or accessory of the same type.
  • Bluetooth is switched off.
Image alternative
Connection interrupted
An existing Bluetooth connected to a device or accessory has been interrupted.
Image alternative
Analysis of running time
The display shows drilling time (diamond core drilling machine actually drilling) at the top and operating hours (diamond core drilling machine switched on) at the bottom. Both figures are shown in hours, minutes and seconds.
To reset drilling time and all other analysis data, press the Image alternative button and hold it down for a few seconds.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Analysis of operating behavior
This display shows contact pressure during drilling time as a percentage (%). This enables user behavior to be optimized.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Analysis of drilling direction
This display shows an evaluation of the drilling directions in %.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Analysis of gear selection
This display shows an evaluation of the duration of use of the respective gear in %. The arrow always points to the gear with the highest rate of use.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Analysis of use
This reading shows use of the diamond core drilling machine in manual mode and with use of an AF-CA in %.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Connected devices
This display provides an overview of all devices and accessories connected to the diamond core drilling machine.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Start connection setup
Start connection setup process at the diamond core drilling machine first and then at the device or accessory you want to connect.
To start the process of establishing the connection, simultaneously press the Image alternative and Image alternative buttons and hold them down for at least 1 second.
  • The information shown on the display disappears automatically after a few seconds or when you press the Image alternative button.
  • Pressing the Image alternative again takes you to the next analysis data.
Image alternative
Gear selector not latched
The gear selector is in an intermediate position or is not correctly latched.
Operate the gear selector until it latches completely.
Image alternative
Restart interlock
Maximum running time with hole-starting mode active has been exceeded; Fault in the power supply; The diamond core drilling machine has been overloaded; Overheated, water has entered the motor or the cooling running time has ended.
Switch of the power tool is in I position while connection to the power supply being established.
Image alternative
Fault in the power supply (voltage too low)
Undervoltage occurred in the supply network. In the event of undervoltage, the diamond core drilling machine cannot be operated at full power.
  • This information is shown in the display for a few seconds.
Image alternative
Overheating
The diamond core drilling machine has overheated and has switched off or is in the cooling mode. The indicator displays the time remaining until cooling down. If the diamond core drilling machine is still too hot after this time has elapsed, the remaining running time starts from the beginning again.
Image alternative
Time remaining until the carbon brushes must be replaced
The motor of the diamond core drilling machine is running and the carbon brush wear limit has almost been reached. The indicator displays the time remaining until the carbon brushes need to be replaced. The time remaining until the diamond core drilling machine automatically switches off is displayed in hours and minutes.
  • This information is shown in the display for a few seconds.
Image alternative
Service display
The carbon brushes are worn and have to be replaced.
Image alternative
Running in after the carbon brushes have been replaced
The motor of the diamond core drilling machine is running. The carbon brushes have been changed and must be run in by letting the machine run under no load for at least 1 minute without interruption, in order to achieve the optimum service life.
  • The indicator shows the time remaining until the run-in process has been completed.

Items supplied

Diamond core drilling machine, operating instructions.
Other system products approved for use with this product can be found at your local Hilti Store or at: www.hilti.group

Accessories and spare parts

Spare parts
Item number
Designation
51279
Hose connector
2006843
Carbon brushes 220-240 V
2104230
Carbon brushes 100-127 V
To help ensure safe and reliable operation, use only genuine Hilti accessories, spare parts and consumables.

Technical data

For rated voltage, rated current, frequency and/or input power, refer to the country-specific rating plate.
If the product is powered by a generator or transformer, the generator or transformer’s power output must be at least twice the rated input power shown on the rating plate of the product. The operating voltage of the transformer or generator must always be within +5 % and -15 % of the rated voltage of the tool.

DD 250-CA
Weight
15.4 kg
(34.0 lb)
Drilling depth without extension
500 mm
(19.7 in)
Permissible water supply pressure
≤ 7 bar
Rated speed under no load
1st gear
240 /min
2nd gear
580 /min
3rd gear
1,160 /min
4th gear
2,220 /min
Optimum core bit diameter
1st gear
152 mm … 500 mm
(6.0 in … 19.7 in)
2nd gear
82 mm … 152 mm
(3.2 in … 6.0 in)
3rd gear
35 mm … 82 mm
(1.4 in … 3.2 in)
4th gear
12 mm … 35 mm
(0.5 in … 1.4 in)
Ideal distance of the mark on the anchor base plate from the hole center
267 mm
(10.5 in)
Ideal distance of the mark on the vacuum base plate from the hole center
292 mm
(11.5 in)

Permissible core bit diameters for various items of equipment

It is essential to comply with the drilling directions approved for the various items of equipment.
For drilling upward, the use of a wet vacuum cleaner in combination with a water collection system is a mandatory requirement.

DD 250-CA
Ø without accessories
1/2 in … 12 in
Ø with spacer
1/2 in … 18 in
Ø with water collection system and wet-type industrial vacuum cleaner
1/2 in … 10 in

Drill stand


DD-HD 30
Weight
21.4 kg
(47.2 lb)

Bluetooth


DD 250-CA
Frequency band
2,400 MHz … 2,483 MHz
Maximum emitted transmission power
10 dBm

Preparations at the workplace

WARNING
Risk of injury! The drill stand can rotate or topple if not securely fastened.
  • Before using the diamond core drilling machine, secure the drill stand to the work surface with anchors or with a vacuum base plate.
  • Use only anchors suitable for the base material and comply with the anchor manufacturer's instructions.
  • Use a vacuum base plate only when the work surface is suitable for securing the drill stand by the vacuum method.
CAUTION
Risk of injury! Inadvertent starting of the product.
  • Unplug the supply cord before making adjustments to the power tool or before changing accessories.
Observe the safety instructions and warnings in this documentation and on the product.

DD-HD 30: Setting up the drill stand and setting the drilling angle

CAUTION
Crush hazard! Releasing the swivel mechanism on the drill stand can lead to sudden tilting of the rail.
  • To avoid crush hazards, exercise care when releasing the swivel mechanism.
CAUTION
Risk of injury! The diamond core drilling machine can fall.
  • Always fit the cover at the end of the rail. It is as both protector and end stop.
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  1. Loosen the screw at the pivoting joint at the bottom end of the rail and the screw at the top end of the brace.
  2. Adjust the rail to the desired angle.
    • The angle scale at the rear serves as an adjustment aid.
  3. Retighten the two screws securely.

DD-HD 30: Locking the carriage on the drill stand

  1. Pivot the carriage lock in the locked position.
    • The locking pin must engage in this position.
  2. Slightly turn the hand wheel to ensure that the carriage is securely locked.

Fitting the hand wheel on the drill stand

The hand wheel may be fitted on the left-hand or on the right-hand side of the carriage.
In the case of the DD‑HD 30 drill stand, the hand wheel may be fitted on the carriage on two different axes. The upper axis directly affects the carriage drive and the lower axis affects the carriage drive with a gear reduction of 1:3.
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  1. Pull the black ring back to fit the hand wheel.
  2. Fit the hand wheel onto the axle.

Securing the drill stand with an anchor

Hilti metal expansion anchors M16 (5/8") are usually suitable for fastening diamond core drilling equipment to uncracked concrete. Under certain conditions, however, it may be necessary to use an alternative fastening method.
Contact Hilti Technical Service if you have questions about secure fastening.
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WARNING
Risk of injury due to use of wrong anchors! The machine can break loose and cause damage.
  • Use anchors suitable for the material on which you are working and observe the anchor manufacturer’s instructions.
  1. Fit the anchor that is suitable for the corresponding base material. Select the distance according to the base plate used.
    • Ideal distance from the hole center for DD-HD 30: 330 mm (13 in)
  2. Screw the clamping spindle (accessory) into the anchor.
  3. Place the drill stand over the spindle and align it. When using the DD-HD 30 drill stand, use the hole center indicator to help you align the drill stand. When a spacer is used, the drill stand cannot be aligned using the hole center indicator.
  4. Screw the clamping nut on to the spindle but do not tighten it.
  5. Level the base plate by turning the leveling screws. Use the leveling indicators for this purpose. Take care to ensure that the leveling screws make firm contact with the underlying surface.
  6. Tighten the leveling screws evenly until the drill stand is securely fastened.
  7. Check that the drill stand is secure.

Securing the drill stand by vacuum

DANGER
Risk of injury if the diamond core drilling machine falls !
  • Fastening the drill stand to the ceiling only by means of the vacuum securing method is not permissible. A heavy structural support or a threaded spindle, for example, can serve as an additional means of fastening.
WARNING
Risk of injury if pressure is not checked !
  • Before and during drilling, check that the pressure gage pointer remains in the green zone.
In order to use the drill stand with anchor base plate, establish a secure, flat-on-flat connection between vacuum base plate and anchor base plate. Screw the anchor base plate securely to the vacuum base plate. Make sure that the core bit selected for use will not damage the vacuum base plate.
If you are going to drill horizontally, use additional means of securing the diamond core drilling machine (e. g. chain secured to anchor).
Before positioning the drill stand, check that you have sufficient space for assembly and operation.
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  1. Turn all the leveling screws until they project approx. 5 mm underneath the vacuum base plate.
  2. Connect the vacuum connector on the vacuum base plate to the vacuum pump.
  3. Locate the center point of the hole to be drilled. Draw a line from the center of the hole to be drilled in the direction in which the machine is to be positioned.
  4. Make a mark on the line at the specified distance from the center of the hole to be drilled.
    Distance of marking
  5. Switch on the vacuum pump and press and hold the vacuum release valve.
  6. Line up the mark on the base plate with the line.
  7. When the drill stand has been positioned correctly, release the vacuum release valve and press the base plate against the base material.
  8. Use the leveling screws to level the base plate.
  9. Check that the drill stand is secure.
Distance of markingSelect the distance to suit the base plate used.
Ideal distance of the mark on the vacuum base plate from the hole center
292 mm
(11.5 in)
Ideal distance of the mark on the combination base plate from the hole center
292 mm
(11.5 in)

DD-HD 30: Fastening the drill stand with the threaded spindle (accessory)

  1. Remove the cover (with built-in end stop) from the top end of the rail.
  2. Fit the cylindrical connector on the threaded spindle into the end of the rail on the drill stand.
  3. Secure the threaded spindle by turning the eccentric pin.
  4. Position the drill stand on the work surface.
  5. Level the base plate by turning the leveling screws.
  6. Secure the drill stand with the threaded spindle and tighten the threaded spindle.
  7. Make sure that the drill stand is fastened securely.

DD-HD 30: Extending the rail (accessory) on the drill stand

When starting holes, use only core bits or extended core bits with a maximum total length of 650 mm (25 1/2 in).
A depth gage on the rail can be used as an additional end stop.
After removing the extension rail, the cover (with integrated end stop) must be refitted to the drill stand in order to ensure that the safety-relevant end-stop function is restored. The safety-relevant end-stop function becomes inoperative if this component is not fitted.
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  1. Remove the cover (with built-in end stop) from the top end of the rail. Fit the cover on the extension rail.
  2. Fit the cylindrical connector on the extension rail into the end of the rail on the drill stand.
  3. Secure the extension rail by turning the eccentric pin.

DD-HD 30: Fitting the spacer (accessory)

WARNING
Risk of injury. The fastening may become overloaded.
  • When one or more spacers are used, the contact pressure must be reduced in order to avoid overloading the fastening.
The diamond core drilling machine should not already be mounted on the drill stand when the spacer is being fitted.
When core bits with a diameter of 300 mm (11 1/2 in) or greater are used, the distance between the drill stand and the drilling axis must be increased by fitting one or two spacers. The hole center indicator is no longer functional when spacers are used.
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  1. Lock the carriage on the rail with the carriage lock.
  2. Pull out the eccentric pin for locking the diamond core drilling machine on the carriage.
  3. Place the spacer into the carriage.
  4. Push the eccentric pin into the carriage as far as it will go.
  5. Tighten the eccentric pin.
  6. Check to ensure that the spacer is securely fastened.

DD-HD 30: Attaching the diamond core drilling machine to the drill stand

CAUTION
Risk of injury Hazard presented by inadvertent starting of the diamond core drilling machine.
  • The diamond core drilling machine should not be connected to the power supply during set-up.
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  1. Lock the carriage on the rail with the carriage lock.
  2. Pull out the eccentric pin for locking the diamond core drilling machine on the carriage.
  3. Fit the diamond core drilling machine onto the carriage or the spacer.
  4. Push the eccentric pin into the carriage or the spacer as far as it will go.
  5. Tighten the eccentric pin.
  6. Fasten the supply cord in the cord guide to the carriage cover.
  7. Check to ensure that the diamond core drilling machine is securely fastened to the drill stand.

Fitting the water connection (accessory)

ATTENTION
Hazard due to incorrect use! Incorrect use can result in irreparable damage to the hose.
  • Regularly check the hoses for damage and make sure that the maximum permissible water supply pressure (see "Technical data") is not exceeded.
  • Make sure that the hose does not come into contact with rotating parts.
  • Make sure that the hose is not damaged as the carriage advances.
  • Maximum water temperature: 40 °C.
  • Check the water supply system to ensure there are no leaks.
To avoid damage to the components, use only fresh water containing no dirt particles.
A flow meter can be inserted as an accessory between the machine and the water supply.
  1. Connect the water flow regulator to the diamond core drilling machine.
  2. Connect the water supply (hose connection).

installing the water collection system (accessory)

WARNING
Danger of electric shock! There is a possibility of water flowing over the motor and cover if the vacuum removal system is faulty.
  • Cease operations immediately if the vacuum removal system is not working.
The diamond core drilling machine must be at a 90° angle to the slab. The water collection system sealing disc must match the diamond core bit diameter.
Use of the water collection system allows water to be led away under control, thus preventing the surrounding area from being heavily soiled. The best results are achieved with a wet-type industrial vacuum extractor.
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  1. At the front of the drill stand, slacken the bottom screw at the rail.
  2. Slip the water collector holder behind the screw from below.
  3. Securely tighten the screw.
  4. Position the water collector, with seal and water collector sealing disc installed, between the two movable arms of the holder.
  5. Secure the water collector to the holder with the two screws.
  6. Connect a wet-type industrial vacuum extractor to the water collector or establish a hose connection through which the water can drain away.

Types of work

Setting the depth gage (accessory)

  1. Turn the hand wheel until the core bit is in contact with the base material.
  2. Set the desired drilling depth by adjusting the distance between the depth gage and the carriage.
  3. Lock the depth gage in position.

Fitting the diamond core bit (BL chuck)

DANGER
Risk of injury Fragments of the workpiece or of broken insert tools may be ejected and cause injury beyond the immediate area of operation.
  • Do not use damaged insert tools. Check the insert tools for chipping, cracks, or heavy wear each time before use.
CAUTION
Risk of injury when changing the tool! The tool becomes hot as a result of use. It may have sharp edges.
  • Always wear protective gloves when changing the tool.
Diamond core bits must be replaced when the cutting performance and/or rate of drilling progress drops significantly. This generally is the case when the diamond segments reach a height of less than 2 mm (1/16 in).
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  1. Lock the carriage on the rail with the carriage lock. Check to ensure that it is securely fastened.
  2. Open the chuck by turning it in the direction of the "Open brackets" symbol.
  3. From below, push the connection end of the diamond core bit into the chuck on the diamond core drilling machine, making sure that the teeth engage.
  4. Close the chuck by turning it in the direction of the "Closed brackets" symbol.
  5. Check that the diamond core bit is seated securely in the chuck.

Fitting the diamond core bit with an alternative type of chuck

  1. Lock the drive spindle with a suitable open-end wrench.
  2. Tighten the core bit with a suitable open-end wrench.

Selecting the speed

Press the switch only when the tool is stationary.
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  1. Set the selector switch to suit the diameter of the core bit used.
  2. Turn the switch to the recommended setting while turning the core bit by hand at the same time.

Portable residual current device (PRCD)

  1. Plug the diamond core drilling machine’s mains plug into an earthed/grounded power outlet.
  2. Press the "I" or "RESET" button on the PRCD.
    • The indicator lights up.
  3. Press the "0" or "TEST" button on the PRCD.
    • The indicator goes out.
WARNING
Risk of injury due to electric shock! Do not continue operating the diamond core drilling machine if the indicator on the ground fault circuit interrupter does not go out when the 0 or the TEST button is pressed.
  • Have your diamond core drilling machine repaired by Hilti Service.
  1. Press the "I" or "RESET" button on the PRCD.
    • The indicator lights up.

Operating the diamond core drilling machine

WARNING
Risk of personal injury and material damage The diamond core drilling machine may become damaged and the risk of electric shock is increased.
  • Use of the water collection system in conjunction with a wet-type industrial vacuum cleaner is a mandatory requirement for wet drilling overhead.
DANGER
Risk of personal injury and material damage The wet-type industrial vacuum cleaner switches on and off with a delay. This allows water to run over the diamond core drilling machine. The diamond core drilling machine may become damaged and the risk of electric shock is increased.
  • When drilling in an upward direction, the wet-type industrial vacuum cleaner must be switched on manually before opening the water supply valve and switched off again manually after closing the water supply valve.
DANGER
Risk of personal injury and material damage The diamond core drilling machine may become damaged and the risk of electric shock is increased.
  • When drilling in an upward direction, stop working if the suction removal system stops working (e.g. the wet-type industrial vacuum cleaner is full).
WARNING
Risk of personal injury and material damage The water collector cannot function correctly during drilling in an upward direction at an angle. The diamond core drilling machine may become damaged and the risk of electric shock is increased.
  • Do not drill in an upward direction at an angle.
Pressing the button for the hole-starting mode (when the machine is idling or operating under no load) reduces the speed for starting holes. This makes it possible for diamond core bits of large diameters to start holes with greater ease and less vibration. Pressing the button for the hole-starting mode again deactivates this function and the diamond core drilling machine adjusts up to the preset speed. If the function for starting holes is not deactivated before a maximum of two minutes has expired, the diamond core drilling machine automatically switches off.
  1. Slowly open the water flow regulator until the desired volume of water is flowing.
  2. Press the On/Off switch on the diamond core drilling machine to "I".
  3. Release the carriage locking mechanism.
  4. Turn the hand wheel until the core bit is in contact with the base material.
  5. When beginning drilling, apply only light pressure, until the core bit has centered itself. Only increase the pressure afterwards.
  6. Regulate the contact pressure while observing the drilling performance indicator.

Switching off the diamond core drilling machine

WARNING
Risk of personal injury and material damage The diamond core bit fills with water during overhead drilling. The diamond core drilling machine may become damaged and the risk of electric shock is increased.
  • As a first step, carefully allow the water to drain away after completing overhead drilling. This is done by disconnecting the water supply from the water flow regulator and draining the water by opening the water flow regulator. Do not allow the water to run over the motor and cover.
  1. Connect the water flow regulator to the diamond core drilling machine.
  2. Remove the diamond core bit from the hole.
  3. Switch off the diamond core drilling machine.
  4. Lock the carriage on the rail with the carriage lock.
  5. Switch off the wet-type industrial vacuum cleaner (if used).

DD-HD 30: Detaching the diamond core drilling machine from the drill stand

  1. Lock the carriage on the rail with the carriage lock.
  2. Remove the supply cord from the cord guide on the carriage cover.
CAUTION
Risk of personal injury and material damage Hazard presented by a falling diamond core drilling machine.
  • Hold the core drilling machine tightly with one hand by the carrying handle.
  1. Loosen the eccentric pin for locking the tool on the carriage.
  2. Pull out the eccentric pin.
  3. Remove the diamond core drilling machine from carriage.
  4. Push the eccentric pin into the carriage as far as it will go.

Care and maintenance

WARNING
Electric shock hazard! Attempting care and maintenance with the supply cord connected to a power outlet can lead to severe injury and burns.
  • Always unplug the supply cord before carrying out care and maintenance tasks.
Care
  • Carefully remove any dirt that may be adhering to surfaces.
  • Clean the cooling air slots carefully with a dry brush.
  • Use only a slightly damp cloth to clean the casing. Do not use cleaning agents containing silicone as these can attack the plastic parts.
  • Always keep the connection end and the chuck of the core drilling machine clean and lightly greased.
  • Clean the outside of the appliance at regular intervals with a slightly damp cloth. Do not use a spray, pressure jet washer or running water for cleaning.
Maintenance
WARNING
Danger of electric shock! Improper repairs to electrical components may lead to serious injuries including burns.
  • Repairs to the electrical section of the tool or appliance may be carried out only by trained electrical specialists.
  • Check all visible parts and controls for signs of damage at regular intervals and make sure that they all function correctly.
  • Do not operate the product if signs of damage are found or if parts malfunction. Have it repaired immediately by Hilti Service.
  • After cleaning and maintenance, fit all guards or protective devices and check that they function correctly.
To help ensure safe and reliable operation, use only genuine Hilti spare parts and consumables. Spare parts, consumables and accessories approved by Hilti for use with the product can be found at your local Hilti Store or online at: www.hilti.group .

DD-HD 30: Adjusting the play between rail and carriage

You can adjust the play between rail and carriage using the four adjusting screws on the carriage.
  1. Loosen the adjusting screws using a 5 mm hex key (do not remove the screws).
  2. Using a 19 mm open-end wrench, turn the adjusting screws so that the rollers are pressed slightly against the rail.
  3. Tighten the adjusting screws firmly. The carriage is correctly adjusted when it remains in position without a diamond core drilling machine fitted and moves down when a drilling machine is mounted.

Replacing the carbon brushes

WARNING
Risk of injury due to electric shock !
  • The machine may be operated, serviced and repaired only by trained, authorized personnel. This personnel must be specially informed of any possible hazards.
The service display appears in the display when the carbon brushes need to be replaced. Always change all the carbon brushes at the same time.
  1. Disconnect the diamond core drilling machine from the power supply.
  2. Open the carbon brush covers on the left-hand and right-hand sides of the motor.
    • Take note of how the carbon brushes are installed and how the conductors are positioned.
  3. Remove the worn carbon brushes from the diamond core drilling machine.
  4. Fit the new carbon brushes, positioning them exactly the same as the old ones fitted previously.
    • Take care to avoid damaging the insulation on the indicator lead as you insert the brushes.
  5. Screw on the carbon brush covers on the left- and right-hand side of the motor.
  6. Run in the carbon brushes by letting the machine run under no load for at least one minute without interruption.
    After replacing the carbon brushes, the display Run-in after the carbon brushes have been replaced appears. The time bar shows the time remaining until the run-in process has been completed.
    If the minimum running-in time of one minute is not observed, the life of the carbon brushes will be greatly reduced.

Transport and storage

ATTENTION
Hazard due to low temperatures! Water finding its way into this product can result in damage and increases the risk of electric shock.
  • When temperatures drop below zero, check that no water remains in the machine.
Transport
  • Do not transport this product with an accessory tool installed.
  • Make sure that the equipment is held securely throughout all transport operations.
  • After transporting, always check all visible parts and controls for signs of damage and make sure that they all function correctly.
Storage
  • Open the water flow regulator before stowing away the product.
  • Always store this product with the electric supply cable unplugged from the electricity supply.
  • Store this product in a dry place, where it cannot be accessed by children or unauthorized persons.
  • After a long period of storage, always check all visible parts and controls for signs of damage and make sure that they all function correctly.

Troubleshooting

If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by yourself, please contact Hilti Service.

The diamond core drilling machine is in working order

Malfunction
Possible cause
Action to be taken
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Restart interlock
Switch of the power tool is in I position while connection to the power supply being established.
  • Switch the diamond core drilling machine off and then on again.
The diamond core drilling machine has been overloaded
  • Switch the diamond core drilling machine off and then on again.
  • Do not overload the diamond core drilling machine (e.g. by repeated disengagement of the slip clutch).
Maximum running time with hole-starting mode activated exceeded.
  • Switch the diamond core drilling machine off and then on again.
Water in the motor.
  • Allow the diamond core drilling machine to dry out completely in a warm, dry place.
  • Switch the diamond core drilling machine off and then on again.
Supply network fault – the power supply has been interrupted.
  • Check whether other power consumers are disrupting the power supply from the network or generator.
  • Check the length of the extension cord used.
  • Switch the diamond core drilling machine off and then on again.
The motor has overheated. The cooling down process is complete.
  • Switch the diamond core drilling machine off and then on again.
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Overheating
The motor has overheated. The diamond core drilling machine is running in cooling mode.
  • Wait a few minutes until the motor has cooled down or allow the diamond core drilling machine to run under no load in order to speed up the cooling process. When normal temperature is reached, the indicator goes out and the diamond core drilling machine switches to restart interlock. Switch the diamond core drilling machine off and then on again.
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Remaining running time until the carbon brushes are changed.
The carbon brush wear limit has almost been reached. The diamond core drilling machine will continue to run for a few hours until it shuts down automatically.
  • Have the carbon brushes replaced at the next opportunity.
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Running in after carbon brushes are changed.
The carbon brushes have been changed and must be run in.
  • Run in the carbon brushes by letting the machine run under no load for at least 1 minute without interruption.
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Unable to activate hole-starting mode
Diamond core drilling machine is drilling.
  • Turn the hand wheel until the core bit is no longer in contact with the base material.
The motor has overheated. The diamond core drilling machine is running in cooling mode.
  • Complete the cooling process.
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Undervoltage - diamond core drilling machine does not develop full power.
Supply network fault – undervoltage occurred.
  • Check whether other power consumers are disrupting the power supply from the network or generator.
  • Check the length of the extension cord used .
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Multifunction display indicates "0" at the gear display and the diamond core bit doesn’t rotate.
The gear selector isn’t engaged.
  • Operate the gear selector until it engages.
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Connection has been interrupted
Existing Bluetooth connection has been separated.
  • Make sure there is a clear line of sight between the product and the accessory. Local conditions such as reinforced concrete walls, for example, can affect the quality of the connection.
  • Connect the accessories to the diamond core drilling machine again.
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Bluetooth off
Bluetooth is deactivated.
  • Activate the Bluetooth function. Simultaneously press the buttons Image alternative and Image alternative.
Another diamond core drilling machine has automatically connected to the accessory used (e.g. water treatment system) via Bluetooth.
Several diamond core drilling machines are connected to the same accessory. The accessory always connects automatically to the diamond core drilling machine that enables the connection to be established fastest.
  • Switch Bluetooth on the accessory off and then on again and connect the diamond core drilling machine to the accessory again.
The diamond core bit doesn’t rotate.
The diamond core bit has become jammed in the base material.
  • Use an open-end wrench to release the diamond core bit: Disconnect the mains plug from the power outlet. Grip the diamond core bit with a suitable open-end wrench close to the connection end and release the diamond core bit by rotating it.
  • If using a drill stand: Turn the hand wheel and try to release the diamond core bit by moving the carriage up and down.
The drilling speed is decreasing.
Maximum drilling depth has been reached.
  • Remove the core and use a core bit extension.
The core is stuck in the diamond core bit.
  • Remove the core.
Wrong core bit specification for the base material.
  • Select a more suitable diamond core bit specification.
High steel content (indicated by clear water containing metal cuttings).
  • Select a more suitable diamond core bit specification.
The diamond core bit is defective.
  • Check the diamond core bit for damage and replace it if necessary.
Wrong gear selected.
  • Select the right gear.
Contact pressure is too low.
  • Increase the contact pressure.
The machine has too little power.
  • Select the next lower gear.
The diamond core bit is polished.
  • Sharpen the diamond core bit by drilling into a sharpening plate.
The water flow rate is too high.
  • Reduce the water flow rate by adjusting the water flow regulator.
The water flow rate is too low.
  • Check the water supply to the diamond core bit or, respectively, increase the water flow by adjusting the water flow regulator.
The carriage lock is engaged.
  • Release the carriage locking mechanism.
Dust is hindering drilling progress.
  • Use a suitable dust removal system.
The hand wheel can be turned without resistance.
The shear pin is broken.
  • Replace the shear pin.
The diamond core bit can’t be fitted into the chuck.
The core bit connection end or chuck is dirty or damaged.
  • Clean and grease the connection end and/or the chuck or replace these parts.
Water escapes at the water swivel or gear housing.
The water pressure is too high.
  • Reduce the water pressure.
Water escapes from the chuck during operation.
The diamond core bit isn’t securely tightened in the chuck.
  • Tighten the diamond core bit securely.
  • Remove the core bit. Rotate the diamond core bit approx. 90° about its own axis. Refit the diamond core bit.
The core bit connection end / chuck is dirty.
  • Clean and grease the connection end and/or the chuck.
The seal at the chuck or at the connection end is defective.
  • Check the seal and replace it if necessary.
No water is flowing.
The water channel is blocked.
  • Increase the water pressure or flush the water channel clear from the opposite direction.
  • Clean the water inlet and outlet apertures.
The drilling system has too much play.
The diamond core bit isn’t securely tightened in the chuck.
  • Tighten the diamond core bit securely.
  • Remove the core bit. Rotate the diamond core bit approx. 90° about its own axis. Refit the diamond core bit.
The core bit connection end / chuck is defective.
  • Check the connection end and chuck and replace them if necessary.
The carriage has too much play.
Screws / bolts on the drill stand are loose.
  • Check the security of screws / bolts on the drill stand and tighten them if necessary.
The drill stand is inadequately fastened.
  • Fasten the drill stand more securely.
The connection between the diamond core drilling machine and the carriage or spacers is loose.
  • Check the connection and, if necessary, refasten the diamond core drilling machine.

The diamond core drilling machine is not in working order

Malfunction
Possible cause
Action to be taken
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The multifunction display is not showing anything.
The PRCD isn’t switched on.
  • Check that the PRCD is functioning and switch it on.
Interruption in the electric supply.
  • Plug in another electric tool or appliance and check whether it works.
  • Check the plug connections, supply cord, power supply line and main supply fuse.
Water in the motor.
  • Allow the diamond core drilling machine to dry out completely in a warm, dry place.
  • Switch the diamond core drilling machine off and then on again.
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Service required.
The carbon brushes are worn out.
Water in the motor.
  • Allow the diamond core drilling machine to dry out completely in a warm, dry place.
  • Switch the diamond core drilling machine off and then on again.

Disposal

Image alternative Most of the materials from which Hilti tools and appliances are manufactured can be recycled. The materials must be correctly separated before they can be recycled. In many countries, your old tools, machines or appliances can be returned to Hilti for recycling. Ask Hilti Service or your Hilti representative for further information.
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  • Do not dispose of power tools, electronic equipment or batteries as household waste!

FCC statement (applicable in US) / IC statement (applicable in Canada)

This device complies with Part 15 of the FCC Rules and RSS-210 of lC. Operation is subject to the following two conditions:
  1. this device may not cause harmful interference, and
  2. this device must accept any interference received, including interference that may cause undesired operation.

Manufacturer’s warranty

  • Please contact your local Hilti representative if you have questions about the warranty conditions.

Further information

China RoHS (Restriction of Hazardous Substances)
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This table is valid for the China market.
Taiwan RoHS (Restriction of Hazardous Substances)
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This table is valid for the Taiwan market.