Troubleshooting - Hilti DX 5 GR Original Operating Instructions

6. Spray the cleaned parts with the supplied Hilti lubricant spray.
Use only Hilti lubricant spray or a product of comparable quality. Use of other lubricants may
damage the tool.
7. Spray the power regulation wheel with the Hilti spray supplied with the tool.
6.8 Assembling the single-fastener tool
1. Check whether there is a cartridge in the tool, and remove it if there is.
2. Fit the exhaust gas piston return unit.
3. Fit the piston.
4. Fit the buffer onto the fastener guide.
5. Screw on the fastener guide.
6.9 Final check of the tool
1. After carrying out care and maintenance work, check that all safety devices are fitted and that they are
functioning correctly.
2. After checking the tool, press and hold the pushbutton for 10 - 12 seconds to reset the maintenance
counter.
7

Troubleshooting

7.1 Problems with the tool
Trouble or fault
Higher force required to press
the tool against the surface.
Trigger resistance increases.
Stiff movement of power reg-
ulation wheel
The piston jams in the ex-
haust gas piston return unit.
The exhaust gas piston return
unit jams.
The tool cannot be fired
7.2 Problems with fasteners to be driven into steel
Malfunction
The fastener doesn't pene-
trate deep enough
2211872
*2211872*
Printed: 02.08.2018 | Doc-Nr: PUB / 5433085 / 000 / 01
13
Possible cause
Build-up of combustion residues.
Build-up of combustion residues.
Build-up of combustion residues.
The piston is damaged.
Rubber dust or debris in the piston
return unit.
Build-up of combustion residues.
Build-up of combustion residues.
The tool was not pressed fully
against the working surface.
The piston is incorrectly
positioned.
Possible cause
Driving power is too low.
Action to be taken
▶ Service the tool.
▶ Service the tool.
▶ Service the tool.
▶ Change the piston.
▶ Check the piston and buffer and
replace if necessary.
▶ Contact Hilti Service if the
problem persists.
▶ Service the tool.
▶ Service the tool.
▶ Press the tool fully against the
working surface.
▶ Remove the cartridge strip and
clean the tool.
▶ Check the piston and buffer and
replace if necessary.
Action to be taken
▶ Increase driving power (adjust
power regulating wheel).
▶ Use a more powerful cartridge.
English 23