8.3 Maintenance
WARNING
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
Check all external parts o f the power tool for damage
at regular intervals and check that all controls operate
faultlessly. Do not operate the power tool if parts
are damaged or when the controls do not function
faultlessly. If necessary, the power tool should be
repaired by Hilti Service.
8.4 Checking the power tool after care and
maintenance
After carrying out care and maintenance work on
the power tool, check that all protective and safety
devices are fitted and that they function faultlessly.
9. Troubleshooting
Fault Possible cause Remedy
The power tool
doesn’t start.
Interruption in the electric supply. Plug in another electric appliance and
check whether it works.
Supply cord or plug defective.
Have the supply cord and plug checked by
a trained electrical specialist and replaced
if necessary.
Other electrical fault.
Have it checked by a trained electrical
specialist.
The carbon brushes are worn. Have the supply cord and plug checked by
a trained electrical specialist and replaced
if necessary.
No hammering
action.
The power tool is too cold. Allow the power tool to warm up to the
minimum operating temperature.
See section: Working at low temperatures
Page 23
The function selector switch is set to
“Drilling without hammering”.
Set the function selector switch to
“Hammer drilling”.
The forward/reverse switch is set to
reverse rotation.
Set the forward/reverse switch to forward
rotation.
The power tool
doesn’t achieve full
power.
The extension cord’s conductor cross
section is inadequate.
Use an extension cord with an adequate
conductor cross section. (Please refer to
the “Description” section.)
The control switch is not pressed fully. Press the control switch as far as it will
go.
The drill bit doesn’t
rotate.
The function selector switch is not
engaged or is in the “Chiseling” or “Chisel
adjustment” position.
When the motor has stopped, turn the
function control switch to the “Drilling
without hammering” or “Hammer drilling”
position.
The drill bit can’t
be released.
The chuck is not pulled back fully. Pull the chuck back as far as it will go and
remove the insert tool.
The drill bit makes
no progress.
The forward/reverse switch is set to
reverse rotation.
Set the forward/reverse switch to forward
rotation.
en
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