Transport And Storage - Hilti DD 150-U Mode D'emploi

1. Open the carbon brush covers on the left-hand and right-hand sides of the motor.
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, 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.
4. Screw on the carbon brush covers on the left- and right-hand side of the motor.
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. one minute.
7.3

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.
▶ Open the water flow regulator before stowing away the diamond core drilling machine.
8 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.
8.1 The diamond core drilling machine is not in working order.
Malfunction
The service indicator shows
nothing.
The service indicator lights.
The service indicator blinks.
*434950*
Printed: 09.08.2019 | Doc-Nr: PUB / 5069547 / 000 / 06
Possible cause
The PRCD isn't switched on.
Interruption in the electric supply.
Water in the motor.
The carbon brushes are worn out.
The motor has overheated.
Overload error.
434950
Action to be taken
▶ Check that the PRCD is
functioning and switch it on.
▶ 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.
▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
▶ Replace the carbon brushes.
→ page 18
▶ 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. Switch the diamond
core drilling machine off and
then on again.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Guide the diamond core drilling
machine straight and/or apply
less drilling pressure.
English 19