Troubleshooting - Hilti DD 150-U Mode D'emploi

3. Take note of how the carbon brushes are fitted and
how the conductors are positioned. Remove the
worn carbon brushes from the machine.
4. Fit the new carbon brushes just as the old ones
were fitted (spare part numbers: 100‑127 V carbon
brush set: 2006844, 220‑240 V carbon brush set:
en
2006843).
NOTE Take care to avoid damaging the insulation
on the indicator lead as you insert the brushes.
5. Close the carbon brush covers on the left-hand and
right-hand side of the motor and tighten the retaining
screws.
6. Allow the tool to run in for approx. 1 min. under no
load.
NOTE After replacing the carbon brushes the indi-
cator lamp will go out after the machine has run for
approx. 1 minute.

9 Troubleshooting

Fault
The machine doesn't start.
The service indicator lights.
The machine doesn't start and
the service indicator lights.
The machine doesn't start,
carbon brushes have been
changed, service indicator
lights.
The machine doesn't run and
the service indicator blinks.
The machine doesn't start, theft
protection indicator blinks yel-
low.
18
8.5 Checking the power tool after care and
After carrying out care and maintenance, check that all
protective and safety devices are fitted and that they
function faultlessly.
8.6 Adjusting the play between rail and carriage
NOTE
Play between the rail and the carriage can be adjusted
by turning the carriage play adjustment screws.
Use an Allen key to tighten the carriage adjustment
screws to a torque of 5 Nm (finger-tight) and then turn
the screws back ¹/₄ of a turn.
The carriage is correctly adjusted if it remains in position
when no core bit is fitted but moves down under its own
weight when a core bit is fitted.
Possible cause
Interruption in the electric supply.
On/off switch defective.
Interruption in the electric supply.
The electronics are defective.
Water in the machine.
The carbon brushes are worn; the
machine will continue to run for a few
hours.
The carbon brushes are worn.
A fault has occurred in the power tool.
The machine has overheated.
Overload error.
The power tool has not been un-
locked (tools with optional theft pro-
tection system).
maintenance
Remedy
Plug in another electric appliance and
check whether it works. Check the
plug connections, supply cords and
extension cords, GFCI and electric
supply.
If necessary, the power tool should be
repaired by Hilti Service.
Check the supply cord, extension
cord, supply cord plug, GFCI and
have them replaced by a qualified
electrician if necessary.
The machine should be repaired by
Hilti Service.
Dry the machine.
The machine should be repaired by
Hilti Service.
The carbon brushes should be
changed.
See section: 8.4 Replacing the carbon
brushes 26
Replace the carbon brushes.
See section: 8.4 Replacing the carbon
brushes 26
If necessary, the power tool should be
repaired by Hilti Service.
Wait a few moments until the motor
has cooled down or allow it to run
under no load in order to speed up
the cooling-down process.
Switch the machine off and on again.
Use the TPS key to unlock the power
tool.