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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.
7.1
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.
7.2
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.
8
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.
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