Hilti DX 6 Manual page 40

▶ The piston rings are cracked or missing.
▶ The piston is bent (check by rolling the piston on a smooth, flat surface).
2. The buffer must be replaced in the following cases:
▶ The metal ring of the buffer is loose or broken.
▶ The buffer no longer holds on the fastener guide.
▶ The rubber is badly worn at certain points under the metal ring.
8.3.3 Cleaning and oiling fastening tool
Use only Hilti spray. The use of other lubricants can cause malfunctions or damage the fastening tool.
1. Unload the fastening tool (cartridges and fasteners) and dismantle the fastening tool. → page 31
2. Use the flat brush supplied for the purpose to clean the piston rings until the piston rings move freely.
3. Use the flat brush to clean the lock of the fastener guide.
4. Oil the lock of the fastener guide and then wipe the lock lightly with a cloth.
5. Use the large round brush supplied for the purpose to clean the inside of the exhaust gas piston return
unit.
6. Oil the lock of the exhaust gas piston return unit on the inside.
7. Use the flat brush to clean the back end of the exhaust gas piston return unit and the pins.
8. Oil the pins and then wipe the pins lightly with a cloth.
9. Use the tapered brush supplied for the purpose to clean the tapered cartridge chamber.
10. Clean the cartridge barrel with the cleaning rod supplied for the purpose.
8.3.4 Final check of the fastening tool
1. After carrying out care and maintenance, check that all protective and safety devices are fitted and that
they function faultlessly.
2. Reset the cleaning indicator. → page 29
9 Problems with the fastening tool
Before you start troubleshooting, make sure there are no cartridges in the fastening tool. If the cartridges
cannot be removed, contact Hilti Service.
If the trouble you are experiencing is not listed in this table or you are unable to rectify the problem by
yourself, please contact Hilti Service.
Malfunction
The piston gets stuck in the
base material
Higher force required to press
the tool against the surface
Trigger resistance increases
Selector ring for driving en-
ergy is difficult to turn
32 English
11
Possible cause
The fastener is too short.
The fastener has no washer.
Too much driving energy.
Build-up of combustion residues.
Build-up of combustion residues.
Build-up of combustion residues.
Action to be taken
▶ Use a longer fastener.
▶ Use a fastener with washer for
applications on wood.
▶ Turn the selector ring for driving
energy to reduce driving energy.
▶ Service the tool.
▶ Clean the cartridge chamber.
▶ Insert new cartridge strip.
▶ Contact Hilti Service.
▶ Service the tool.
▶ Clean the cartridge chamber.
▶ Insert new cartridge strip.
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