Hilti DX 351 Original Operating Instructions page 31

Fault
Piston stuck in magazine fastener
guide
Fastener penetrates too deeply
Fastener does not penetrate
deeply enough
Nail bends
Printed: 12.08.2013 | Doc-Nr: PUB / 5069821 / 000 / 02
Cause
■ Piston damaged
■ Plastic debris inside the
magazine
■ Excess power when fastening on
steel
■ Tool fired with high power
without fastener in place
■ Fastener too short
■ Driving power too high
■ Fastener too long
■ Driving power too low
■ Hard and/or large aggregate in
concrete
■ Rebar close to surface of
concrete
■ Hard surface (steel)
Possible remedies
■ Unscrew the magazine
■ Unscrew the black part of the
housing
■ Check piston and replace if
necessary (see 7.1–7.5)
■ Open magazine, remove fastener
strip and plastic debris
■ Reduce the power setting
■ Avoid firing the tool without a
fastener in place
■ Use longer fastener
■ Reduce power setting
■ Use lighter cartridge
■ Use shorter fastener
if permissible
■ Increase power setting
■ Use heavier cartridge
■ Use a more powerful system
such as the DX 460
■ Use shorter fastener if permiss-
able
■ Use a nail with a higher applicati-
on limit
■ Change to single fasteners
■ Use an alternative system (spall
stop or DX-Kwik)
en
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