Categories: HILTI

HILTI DD AF-CA H Auto Feed Unit Instruction Manual

HILTI DD AF-CA H Auto Feed Unit Instruction Manual

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 !

  • Draws attention to imminent danger that will lead to serious personal injury or fatality.

WARNING !

  • Draws attention to a potential threat of danger that can lead to serious injury or fatality.

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:

Read the operating instructions before use.
Instructions for use and other useful information
Dealing with recyclable materials
Do not dispose of electric equipment and batteries as household waste

Symbols in the illustrations
The following symbols are used in illustrations:

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

Product-dependent symbols

Symbols on the product

The following symbols can be used on the product:

Alternating current
Protection class II (double insulated)
The product supports wireless data transfer.
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.
Product information

HILTI 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

Auto-feed unit DD AF-CA H
Generation: 01
Serial no.:
Declaration of conformity

We declare, on our sole responsibility, that the product described here complies with the applicable directives and standards. A copy of the declaration of conformity can be found at the end of this documentation.
The technical documentation is filed here:
Hilti Entwicklungsgesellschaft mbH | Tool Certification | Hiltistrasse 6 | D-86916 Kaufering, Germany

Safety

Safe operation of the auto-feed unit

WARNING

Non-compliance with safety instructions of the system products! The auto-feed unit is a system product that is used only in combination with a diamond core drilling machine and a drill stand.

  • Use the auto-feed unit only with compatible system products listed  in the section headed “Intended use”.
  • Also study and follow all instructions relating to safety and operation in the corresponding operating instructions of the system products (diamond core drilling machine, drill stand).

Study all safety instructions and other instructions, images and technical data with which this power tool is provided. Failure to observe the instructions below or the instructions of the system products can result in electric shock, fire and/or serious injury

Keep all safety precautions and instructions for future reference.
The term “power tool” used in the safety precautions refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

General safety instructions

  • When you operate the drilling system with auto-feed unit, always secure the drill stand by means of anchors. The use of a vacuum pump is not permissible. When the auto-feed unit is operating in automatic mode, the vacuum base plate can become detached if the vacuum unexpectedly drops below the specified range.
  • Keep the power tool out of reach of children.
  • Remove the hand wheel when you are going to operate the drilling system with the auto-feed unit.
    When the auto-feed unit is operating in automatic mode, the hand wheel tends to turn and can lead to injuries or cause cables or hoses to become wrapped around it.
  • Make sure that the power tool is correctly and securely mounted on the drill stand. The auto-feed unit has to be engaged at one of the keyed positions and it must be secured with the securing screw.

Additional safety instructions

  • Make sure that the supply cord cannot be damaged as the carriage advances.
  • On account of the drilling system’s dead weight, as soon as the carriage lock is disengaged the drilling system can glide down the drill stand without any braking effect by the installed auto-feed unit. Be prepared for this and hold the drilling system in place with one hand.
  • If the drill stand has not been fastened correctly, always move the drilling system with installed core bit all the way down in order to prevent the stand from falling over.
  • Keep the supply cord, extension cord and water hoses away from rotating parts.

Description

Components and controls

  1. Emergency stop
  2. Carrying handle
  3. Holder for supply cord
  4. Supply cord
  5. Mounting interface with square shaft
  6. Rating plate
  7. Cooling water connection (to the diamond core drilling machine)
  8. Cooling water connection to water supply
  9. Securing screw
Intended use

The DD AF-CA H auto-feed unit, a type DD 250-CA diamond core drilling machine and a type DD-HD 30 drill stand together form a diamond core drilling system suitable for wet core drilling in mineral materials.
The auto-feed unit is operated via the display of the diamond core drilling machine.

  • In operation, the auto-feed unit must be mounted on the drill stand.
  • For operation with the auto-feed unit, the drilling system must be secured exclusively by the anchor base plate, not by the vacuum base plate.
  • The auto-feed unit has to be removed to permit manual drilling with control by the hand wheel.

The product, accessories and tools can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use.

For safe operation of the auto-feed unit, also study and follow all instructions relating to safety and operation in the operating instructions of the system products (diamond core drilling machine, drill stand)!

Warning stickers on the product

The following warning stickers are affixed to the product.

  • It is not permissible to use a vacuum pump as means of securing a drilling system with auto-feed unit.
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 product

  • Service and status messages of the paired Hilti devices are shown on the display.
  • Communication with the paired diamond core drilling machine in automatic drilling operation.

Switching Bluetooth on or off

Hilti products ship ex-works with Bluetooth deactivated. Bluetooth switches itself on automatically during initial operation.

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 in the multifunction display (when starting)

The following symbols appear on the display of the diamond core drilling machine as soon as the auto-feed unit is started.

For more information on the pairing procedure see the section headed “Pairing auto-feed unit and diamond core drilling machine”.

Display Explanation
Devices are paired

Appears only when a new pairing connection is established between auto-feed unit and a diamond core drilling machine.

Press the EMERGENCY STOP switch.
Reset the EMERGENCY STOP switch.

Display symbols in the multifunction display (normal operating status)

The following symbols can be displayed when the auto-feed unit is paired with the diamond core drilling machine and the auto-feed unit is in normal operating status.

Other, context-sensitive messages can also be shown on the display. If a message not listed here appears on the display, consult the “Troubleshooting” section.

Display Explanation
“Position CUT-ASSIST” mode
“Set up and activate CUT-ASSIST” mode
Set power reduction
  • for jobsites with unstable AC supply
Set water valve
  • for overhead drilling jobs
Set hole-starting modes
  • for drilling at an angle and drilling with core bits of small diameter up to max. 25 mm
Set break-through detection
  • for drilling into materials with voids
Drilling process in CUT-ASSIST mode: Search for material surface in progress
Drilling process in CUT-ASSIST mode: Current drilling depth (unit of measure corresponds to the market)
Items supplied

Auto-feed unit, operating instructions Other system products approved for use with this product can be found at your local Hilti Store or at: www.hilti.group

EMERGENCY STOP switch

The EMERGENCY STOP switch enables you to stop the drilling operation immediately in emergency situations. The drilling system remains under electric power after an emergency stop has been triggered.
Operation of the system cannot be resumed until the emergency stop has been canceled.

Before putting the drilling system into operation, always check that the EMERGENCY STOP switch is in full working order:

Press the EMERGENCY STOP switch.

  • Emergency stop is triggered.

If the drilling system is not connected or not paired, the auto-feed unit automatically initiates an attempt to connect or pair.

  • Wait until this process has completed.

Reset the EMERGENCY STOP switch by pulling it up.

  • The drilling system changes to the Position CUT ASSIST mode.
  • The test is successfully completed and the drilling system is ready for use.

Technical data

Product properties
Weight, ready for use 4.2 kg
Dimensions (L × W × H) 176 mm x 137 mm x 325 mm
Max. permissible water supply pressure ≤ 6 bar
Protection class Protection class II
Protection class IP 55
Bluetooth
Frequency band 2,400 MHz … 2,483 MHz
Maximum emitted transmission power 10 dBm
Rated voltage
Rated voltage 110 V … 120 V 220 V … 240 V
Rated frequency 50 Hz … 60 Hz 50 Hz … 60 Hz
Rated current input 0.6 A 0.4 A
Noise and vibration values

The auto-feed unit is a system product and is operated exclusively in combination with a diamond core drilling machine. The operating noises of the auto-feed unit are minor and do not contribute to a relevant increase in the acoustic emissions of the overall drilling system.

The acoustic emissions and vibration emissions of the diamond core drilling machine used apply.
Also study and follow all instructions relating to safety and operation in the corresponding operating instructions of the system products (diamond core drilling machine, drill stand).

Preparations at the workplace

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.

Installing the auto-feed unit

WARNING

Risk of injury! The drill stand can rotate or topple if not securely fastened.

  • Before using the drilling system, always secure the drill stand to the surface of the material to be drilled with an anchor.
  • Use only anchors suitable for the base material and comply with the anchor manufacturer’s instructions.

Before installing the auto-feed unit, check the following points:

  • The carriage of the drill stand has a mounting interface for a Hilti auto-feed unit.
  • The hand wheel has been removed from the carriage of the drill stand.

The adapter for the auto-feed unit is on the side of the carriage. The auto-feed unit can be installed in any of 5 mounting positions. The 5 mounting positions of the auto-feed unit are keyed in 30° steps between 0° and 120°. The auto-feed unit can be secured with the securing screw only at these positions.

  1. Lock the carriage with the carriage lock.
  2. Set the auto-feed unit on the mounting adapter of the drill stand.
  3. Turn the auto-feed unit until the square shaft engages in the square-shaft adapter on the carriage.
  4. Hold the auto-feed unit and disengage the carriage lock.
  5. Position the auto-feed unit at one of the 5 keyed mounting positions.
    • The auto-feed unit engages correctly at the keyed position.
    • The EMERGENCY STOP switch is freely accessible.
    • The auto-feed unit does not obstruct the planned drilling operation.
  6. Tighten the securing screw by hand.
  7. Connect the cooling water connector of the auto-feed unit to the water connection of the diamond core drilling machine.
  8. Connect the electric supply cord and the water supply hose.
    • The water valve switches with an audible click.
  9. Check that the auto-feed unit and the cooling water supply are correctly installed and connected.
Pairing auto-feed unit and diamond core drilling machine

Establishing a new Bluetooth connection (pairing)

Before you can use the auto-feed unit with a diamond core drilling machine as a drilling system, you have to pair the two system products via Bluetooth. This pairing remains saved as a successful pairing operation until you pair another auto-feed unit to the diamond core drilling machine, overwriting the existing pairing.

Pair the auto-feed unit only to a diamond core drilling machine recommended by Hilti. The supply voltage must match the ratings stated on the rating plate of the diamond core drilling machine.

  1. Install the auto-feed unit on the carriage of the drill stand. → page 20
  2. Establish the electricity supply to the drilling system.
  3. Simultaneously press the and buttons on the diamond core drilling machine.
  4. Check that the EMERGENCY STOP switch is in full working order.
    • The auto-feed unit pairs with the diamond core drilling machine.
    • A symbol appears in the status bar of the display.
      Other paired system products (e.g. DD WMS 100) can also be shown in the status bar.
  5. The drilling system changes to the “Position CUT-ASSIST” mode.
    • The corresponding status indicator appears on the display.

Re-establishing an existing Bluetooth connection

When power is switched on, the auto-feed unit automatically attempts to re-establish the Bluetooth to the diamond core drilling machine to which it is currently paired.

  1. Establish the electricity supply to the drilling system.
  2. Check that the EMERGENCY STOP switch is in full working order.
    • The auto-feed unit establishes a connection to the diamond core drilling machine.
    • A symbol appears in the status bar of the display.
      Other paired system products (e.g. DD WMS 100) can also be shown in the status bar.
  3. The drilling system changes to the “Position CUT-ASSIST” mode.
    • The corresponding status indicator appears on the display

Types of work

WARNING

Damaged power cords are a safety hazard! If the supply cord or extension cord is damaged while work is in progress, immediately disconnect the device and the cord from the electricity supply. Do not touch the damaged part of the cord.

Regularly check all supply cords. Replace defective extension cords. Have damaged power cords replaced by a qualified specialist.

  • For safe operation of the auto-feed unit, also study and follow all instructions relating to safety and operation in the operating instructions of the diamond core drilling machine!
  • In operation with the auto-feed unit, the and buttons on the diamond core drilling machine can be assigned context-specific functions. In this case, an appropriate symbol appears on the display above the corresponding button.
Performing the core drilling operation

DANGER

Risk of injury due to failure to observe the danger zone! The auto-feed unit is always in Cut Assist mode after the diamond core drilling machine is switched on and it starts the automatic drilling process as soon as the confirmation button on the diamond core drilling machine is pressed. The core bit is automatically advanced until it contacts the surface of the object to be drilled.

  • Make sure there is no-one in the danger zone!
  • Keep the zone between the core bit and the surface of the object to be drilled clear!

Before you start drilling, check that the auto-feed unit is paired to the diamond core drilling machine. If the systems are not paired the EMERGENCY STOP switch has no effect!

Do not run more than one power tool at a time off a generator or transformer. Switching another power tool connected to the same generator/transformer on and off can cause undervoltage dips and overvoltage spikes that can damage the product.

Positioning CUT-ASSIST

The following preconditions must be fulfilled:

  • The auto-feed unit is mounted correctly on the drill stand.
  • The auto-feed unit and the diamond core drilling machine are paired and the Bluetooth connection is established.
  • The display shows “Position CUT-ASSIST”.
  1. Set the drill stand to the correct drilling angle.
  2. Use the and buttons to position the diamond core drilling machine.
    • The carriage moves faster when you hold the button down.
  3. Install the core bit and other accessories.
  4. Activate the continuous-running lock on the diamond core drilling machine.
    • The system changes to the “Set up CUT-ASSIST” mode. The corresponding status indicator appears on the display.

Setting up and activating CUT-ASSIST

The following preconditions must be fulfilled:

  • The auto-feed unit is mounted correctly on the drill stand.
  • The auto-feed unit and the diamond core drilling machine are paired and the Bluetooth connection is established.
  • The continuous-running lock on the diamond core drilling machine is activated and the display shows “Set up CUT-ASSIST”.
  1. Set other parameters of the drilling system as necessary.
    • Step through the sequence of functions by pressing the button.
    • Step through the sequence of settings for the individual functions by pressing the button.
    • See Section 6.1.3 for more information about the possible settings.
  2. Navigate to the “Set up CUT-ASSIST” mode.
  3. Start the drilling operation by pressing the button.

Parameters to be set on the auto-feed unit

Before you start the drilling operation, you can set certain parameters for the current drilling operation. The settings are saved for as long as the system remains connected to the electricity supply. When the power supply is disconnected, the parameters are reset to the factory default settings.
You can set the following parameters:

Power reduction

In overload situations on the jobsite, the system’s power draw can be reduced. This means that drilling can continue without interruption. Reducing current consumption is comparable with reducing contact pressure when using the diamond core drilling machine in manual mode.

There is a choice of 3 settings:

  1. Minimum power
  2. Medium power
  3. Maximum power

The factory default setting for power reduction is maximum power.

Overhead drilling

The system does not open the water valve until you switch the diamond core drilling machine on. When you have to carry out overhead work you can change this setting, for example to fill the core bit with water while the motor is stopped, or to drain the core bit and then set it in motion.

There is a choice of 2 settings:

  1. Manual actuation
  2. Automatic actuation

The factory default setting for power reduction is automatic actuation.

Hole-starting mode for drilling at an angle and for small diameters (less than 25 mm) Hole starting in general is done with sharply reduced contact pressure and low speed. When holes have to be drilled at an angle or the diameter of the core bit is less than 25 mm, it is advisable to start the hole at high speed.

There is a choice of 2 settings:

  1. Standard control: Low speed in 1st gear and 2nd gear, high speed in 3rd gear
  2. Alternative control: High speed in all gears.

The factory default setting for hole-starting mode is low speed in 1st gear and 2nd gear, high speed in 3rd gear.

Break-through detection

WARNING

Risk of injury! Injury can result if someone is in the danger zone when the core bit breaks through. With automatic break-through detection deactivated, after the hole has been drilled right through the material the core bit continues to rotate and does not stop automatically.

  • Make sure there is no-one in the danger zone.
  • Fit the depth gauge.

You can deactivate automatic break-through detection, for example when you are going to drill very deep holes or drill into heterogeneous materials with possible voids.

There is a choice of 2 settings:

  1. Break-through detection activated
  2. Break-through detection deactivated

The factory default setting for break-through detection is break-through detection activated.

Drilling in CUT-ASSIST mode

This section describes the procedure for a typical drilling operation in CUT ASSIST mode.

The following preconditions must be fulfilled:

  • The auto-feed unit is mounted correctly on the drill stand.
  • The auto-feed unit and the diamond core drilling machine are paired and the Bluetooth connection is established.
  • The continuous-running lock on the diamond core drilling machine is activated.
  • The drilling operation has been started by pressing the button.
  1. A “Surface search in progress” message appears on the display.
    • The drilling system searches for the surface of the material to be drilled.
    • The drilling system detects the surface.
  2. The drilling system switches the cooling water supply on.
  3. The drilling system starts drilling in hole-starting mode.
  4. The drilling system switches to normal mode and carries out the drilling operation.
    • The current drilling depth is shown on the display.
  5. On detecting a break-through or a depth-gauge stop, the drilling system returns to its initial position.
    • The diamond core drilling machine switches off.
    • The cooling water supply is shut off.

The drilling depth displayed is the totaled drilling depth since the last break-through detection without depth-gauge stop detection. Drilling progress between two consecutive detections equals the total depth of a drill hole.
The information is displayed until a new drilling operation after a break-through detection or a depth-gauge stop detection is started.

Viewing drilling statistics (during and after the drilling operation)

In CUT-ASSIST mode, the analysis data of the diamond core drilling machine are supplemented by analysis data of the auto-feed unit. You can call up the analysis data in the following situations:

  • During the drilling operation.
  • After the drilling operation (EMERGENCY STOP switch pressed)

Call up the analysis data by pressing the button. To browse through the analysis data, repeatedly press the button.

The read-out disappears automatically after 30 seconds.

Analysis data of the auto-feed unit

Reset the ‘Last Job’ counter: You can manually reset all day counters (identifiable by the symbol) of the available analysis data to 0:

  • Press the button and hold it down for at least 5 seconds

You can call up the following analysis data on the auto-feed unit:

Display Explanation
This shows you the operating modes (hand-held, rig-based, with auto- feed unit) in which the diamond core drilling machine was operated (figures are percentages since the last reset of the counter).
This shows you how deep the drilling system has drilled.
  • shows depth drilled in AF-CA mode since the last reset.
  • shows the total depth the diamond core drilling machine has drilled in AF-CA mode.

You can toggle the unit of measure (metric or imperial) used for the readings. Press the button and hold it down for 3 seconds.

This shows you how many holes the drilling system has drilled. The number is the total of break-through detections and depth-gauge stop detections.
  • shows the number of holes drilled in AF-CA mode since the last reset.
  • shows the total number of holes the diamond core drilling machine has drilled in AF-CA mode.

Breaks between work and storage at low temperatures

At temperatures below 4 °C (39 °F), the water in the cooling circuit has to be blown out with compressed air when drilling is interrupted for more than one hour and before the equipment is stowed away.

Removing the auto-feed unit
  1. Lock the carriage with the carriage lock.
  2. Disconnect the drilling system from the electricity supply.
  3. Close the water flow regulator valve and turn off the water supply.
  4. Disconnect the water hose running to the diamond core drilling machine.
  5. Take a firm grip on the auto-feed unit and unscrew the securing screw.
  6. Remove the auto-feed unit.

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 stubborn dirt from the tool.
  • Clean the air vents carefully with a dry brush.
  • Use only a slightly damp cloth to clean the casing. Do not use cleaning agents containing silicone as they can attack the plastic parts.

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.

Transport and storage

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

  • 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.

Product is not in working order
Malfunction Possible cause Action to be taken
Service required
Maintenance work or servicing required. Contact Hilti Service.
Emergency stop
An emergency stop was triggered.
  • Cancel the emergency stop by pulling up the EMERGENCY STOP switch.
  • If the problem persists, consult Hilti Service.
Fault in AC supply
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 exten- sion cord used.
  • Switch the diamond core drilling machine and the auto-feed unit off and then on again.
Product is in working order
Malfunction Possible cause Action to be taken
Overheating
Overheating. Allow the machine to cool down.
The Unknown error service indicator lights up.
Attempt to pair incompatible sys- tem products.
  • Check whether the auto-feed unit is compatible with the diamond core drilling machine (model, voltage ratings).
  • Repeat the pairing attempt with compatible system products.
Diamond core bit jams
The diamond core bit has become jammed in the base material. Turn the hand wheel and try to release the diamond core bit by moving the carriage up and down.
The auto-feed unit cannot be installed. Square drive does not fit, or is not turned to a position at which it can slot into the adapter. Turn the auto-feed unit until the square shaft and the square- shaft socket are in alignment.
The flange on the carriage of the drill stand or on the auto-feed unit is dirty or worn.
  • Clean the flange and check the flange for excessive wear.
  • Replace excessively worn components.
The threaded bushing for the se- curing screw is blocked. Clean the threaded bushing.
The hand wheel cannot be rotated. The carriage lock is engaged.
  • Try to turn the auto-feed unit to match up the flanges.
  • Check the threaded bushings and the threaded studs.
The carriage is obstructed. Make sure that the carriage is free to move.
The water flow rate is too low. Strainer of the auto-feed unit is clogged. Clean the strainer in the water inlet.
Water valve of the auto-feed unit is faulty or blocked.
  • Connect the water supply directly to the diamond core drilling machine and check whether the water valve on the diamond core drilling machine is working.
  • Check whether the valve on the auto-feed unit is blocked or faulty.
  • Check that the water supply is installed correctly.
The auto-feed unit motor runs but the carriage does not move. The auto-feed unit is installed in- correctly. Check the mechanical connec- tion between the auto-feed unit and the carriage.
Cut Assist mode cannot be activated. Auto-feed unit has no AC supply. Check the electricity supply.
An emergency stop was triggered.
  • Cancel the emergency stop by pulling up the EMERGENCY STOP switch.
  • If the problem persists, consult Hilti Service.
The drilling operation slows or stops. The diamond core bit is defective (segments polished or destroyed). Sharpen the diamond core bit or replace it.
The plug connector is faulty or the cable is defective. ▶   Check the connection between the auto-feed unit and the diamond core drilling machine.
The diamond core bit is stuck.
  • Disconnect the diamond core drilling machine from the electric supply.
  • Release the diamond core bit.
Faulty or inadequate cooling. Check the water supply and cooling circuit.
The drilling operation slows or stops. Stopped before reaching the target depth due to transition into softer material such as hollow brick, soil or natural stone.
  • Restart the drilling operation.
  • Switch break-through detection off.
The drilling system vibrates severely during drilling. The drill stand is inadequately fastened Check that the clamping spindle nut is tightened securely.
The carriage has too much play. Check that the clamping spindle nut is tightened securely.
Adjust the play between rail and carriage (comply with the operating instructions of the system components).
Securing screw not correctly tightened (e.g. after a change of angle). Tighten the securing screw
Core bit is faulty or worn. Check the condition of the core bit; replace the core bit if it shows visible signs of damage or wear.
Chuck has worked loose. Check that core bit and chuck are correctly installed.
Contact pressure is too high.
  • Continue drilling in CUT ASSIST mode.
  • Reduce power. Gradually increase power as soon as the drilling system is able to drill without vibrating.

Disposal

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.

Do not dispose of power tools, electronic equipment or batteries as household waste!

Manufacturer’s warranty

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

Further information

For more information on operation, technology, environment and recycling, follow this link: qr.hilti.com/manual?id=0000000&id=0000000

This link is also to be found at the end of the documentation, in the form of a QR code.

 

Documents / Resources

HILTI DD AF-CA H Auto Feed Unit [pdf] Instruction Manual
DD AF-CA H Auto Feed Unit, DD AF-CA H, Auto Feed Unit, Feed Unit, Unit
HILTI DD AF-CA H Auto Feed Unit [pdf] Installation Guide
DD AF-CA H Auto Feed Unit, DD AF-CA H, Auto Feed Unit, Feed Unit

References

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