Troubleshooting, Fault Possible cause Remedy

The outer casing of the power tool is made from impact-resistant plastic. Sections of the grip are made from a synthetic rubber material.

Never operate the power tool when the ventilation slots are blocked. Clean the ventilation slots carefully using a dry brush. Do not permit foreign objects to enter the interior of the power tool. Clean the outside of the power tool at regular intervals with a slightly damp cloth. Do not use a spray, steam pressure cleaning equipment or running water for cleaning. This may negatively affect the electrical safety of the power tool.

8.3 Cleaning or replacing the dust shield

Clean the dust shield on the chuck with a dry, clean cloth at regular intervals. Clean the sealing lip by wiping it carefully and then grease it again lightly with Hilti grease. It is essential that the dust shield is replaced if the sealing lip is found to be damaged. Push the tip of a screwdriver under the edge of the dust shield and prise it out toward the front. Clean

the area of the chuck in contact with dust shield and then fit a new dust shield. Press it in firmly until it engages.

8.4 Maintenance

WARNING

Repairs to the electrical section of the power tool may be carried out only by trained electrical spe- cialists.

Check all external parts of 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.

8.5Checking 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 spe-
		cialist and replaced if necessary.
	Other electrical fault.	Have it checked by a trained elec-
		trical specialist.
	The carbon brushes are worn.	Have the supply cord and plug
		checked by a trained electrical spe-
		cialist and replaced if necessary.
No hammering action.	The power tool is too cold.	Allow the power tool to warm up to
		the minimum operating temperat-
		ure.
		See section: 7.2.1 Working at low
		temperatures
	The function selector switch is set	Set the function selector switch to
	to “Drilling without hammering”.	“Hammer drilling”.
	The forward/reverse switch is set	Set the forward/reverse switch to
	to reverse rotation.	forward rotation.