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2. Take note of how the carbon brushes are fitted and how the conductors are positioned. Remove
the worn carbon brushes from the diamond core drilling machine.
3. Fit the new carbon brushes so that they are positioned 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.
4. Close the carbon brush covers on the left-hand and right-hand side of the motor and tighten the retaining
screws.
5. Run in the carbon brushes by letting the machine run under no load for at least 1 minute without
interruption.
After replacing the carbon brushes the indicator lamp will go out after the machine has run for
approx. 1 minute.
9
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.
▶ Open the water flow regulator before stowing away the product.
▶ At temperatures below the freezing point, make sure that no water remains in the product.
▶ 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.
10
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.
10.1
The diamond core drilling machine is in working order
Malfunction
The service indicator lights.
The diamond core drilling
machine doesn't achieve full
performance.
The diamond core bit doesn't
rotate.
*351007*
Possible cause
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.
Supply network fault – undervolt-
age occurred.
The gear selector isn't engaged.
351007
Action to be taken
▶ Have the carbon brushes
replaced at the next opportunity.
▶ Check whether other power
consumers are disrupting the
power supply from the network
or generator.
▶ Check the length of the exten-
sion cord used.
▶ Operate the gear selector
until it engages.
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