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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. Disassemble the fastening tool. → page 11
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 9
9
Problems with the fastening tool
WARNING! Risk of injury! 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 remedy the problem by
yourself, please contact Hilti Service.
Trouble or fault
Higher force required to press
the tool against the surface
Trigger resistance increases
Selector ring for driving en-
ergy is difficult to turn
The fastener is not driven
deep enough
Piston jamming in exhaust
gas piston return unit
12
English
9
Possible cause
Build-up of combustion residues.
Build-up of combustion residues.
Build-up of combustion residues.
The fastener is too long.
Bad cartridge.
Driving energy too low
The piston is damaged.
Abraded material from buffer inside
the exhaust gas piston return unit.
Build-up of combustion residues.
Action to be taken
▶ 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.
▶ Use a shorter fastener.
▶ Pull the cartridge strip through
to the next cartridge.
▶ Turn the selector ring for driving
energy to increase driving
energy.
▶ Use an extra-strong cartridge.
▶ Change the piston.
▶ Check the piston and buffer and
replace if necessary.
▶ Contact Hilti Service if the
problem persists.
▶ Service the tool.
▶ Clean the cartridge chamber.
▶ Insert new cartridge strip.
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