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7.3
Replacing the on/off switch
1. Disconnect the supply cord plug from the power outlet.
2. Unscrew the screw in the rear part of the housing and remove the rear part of the housing.
3. Slacken the two screws and disconnect the two supply cord conductors.
4. Mark the positions of the flat plugs on the on/off switch.
5. Disconnect the four conductors from the on/off switch.
6. Remove the on/off switch by lifting the other tab.
7. Insert the new on/off switch.
8. Connect the four conductors to the on/off switch in accordance with the markings.
9. Slip the supply cord conductors underneath the two screws and tighten the screws (tightening torque:
0.5-0.8 Nm).
10. Close the housing and tighten the screw in the rear part of the housing (tightening torque: 1.35-1.75 Nm).
7.4
Replacing the carbon brushes
1. Disconnect the supply cord plug from the power outlet.
2. Unscrew the screw in the rear part of the housing and remove the rear part of the housing.
3. Use pliers to slide the spring plate to the side.
4. Remove the carbon brush with your fingers or with the aid of a suitable tool.
5. Unplug the carbon brush.
6. Plug in the new carbon brush.
7. Insert the new carbon brush into the cage.
8. Position the spring plate on the carbon brush and press the parts in firmly.
9. Replace the other carbon brush in the same way.
10. Close the housing and tighten the screw in the rear part of the housing (tightening torque: 1.35-1.75 Nm).
7.5
Checks after care and maintenance work
▶ After carrying out care and maintenance, check that all protective and safety devices are fitted and that
they function faultlessly.
8
Transport and storage
•
Do not transport electric tools with accessory tools fitted.
•
Always unplug the supply cord before storing an electric tool or appliance.
•
Store tools and appliances in a dry place where they cannot be accessed by children or unauthorized
persons.
•
Check electric tools or appliances for damage after long periods of transport or storage.
9
Troubleshooting
If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, contact Hilti Service.
Trouble or fault
The tool doesn't start.
The tool doesn't work.
*2177169*
13
14
Possible cause
Interruption in the electric supply.
The supply cord or plug is defec-
tive.
The carbon brushes are worn.
The tool has been overloaded.
2177169
Action to be taken
▶ Plug in another power tool or
appliance and check whether it
works.
▶ Remove the supply cord.
28
▶ Fit the supply cord.
▶ Replace the carbon brushes.
29
▶ Release the on/off switch and
then press it again. Then allow
the power tool to run under no
load for approx. 30 seconds.
English
28
29
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