Hilti DX 460 GR Original Operating Instructions page 16

Fault
The operator notices:
– increased contact pressure
– increased trigger force
– power regulation stiff to adjust
– cartridge strip is difficult to
remove
Piston is stuck in the piston return
unit and cannot be removed
Piston return unit is stuck
Stud does not
penetrate
surface
Studs does not hold in base
material
Printed: 12.08.2013 | Doc-Nr: PUB / 5129640 / 000 / 01
Cause
■ Carbon build-up
■ Damaged piston
■ Buffer debris inside the piston
return unit
■ Damaged buffer
■ Carbon build-up
■ Carbon build-up
■ Driving power too low
■ Application limit exceeded
(very hard surface)
■ Unsuitable system
■ Thin steel base material
(4 to 5 mm steel)
Possible remedies
■ Clean the tool
(see 8.3–8.14)
■ Check that the correct cartridges
are used (see 1.2) and that they
are in faultless condition.
■ Remove the cartridge strip and
clean the tool (see 8.3-8.14).
Check the piston and buffer and
replace these parts if necessary
(see 8.4).
If the problem persists:
■ Contact Hilti Repair Centre
■ Manually pull the front part of
the piston return unit out of the
tool
■ Check that the correct cartridges
are used (see 1.2) and that they
are in faultless condition.
■ Clean the tool (see 8.3–8.14)
If the problem persists:
■ Contact Hilti Repair Centre
■ Try higher power setting or heav-
ier cartridge
■ Switch to more powerful system
like DX 76 PTR
■ Try different power setting or
different cartridge
en
25