Hilti DX 351-BT Manual page 34

Trouble or fault
The piston jams in the fas-
tener guide
9.2 Problems with fasteners
Malfunction
Damaged fastener head
Fastener breakage
(with deformation)
9.3 Problems with threaded studs
Malfunction
Different stud driving depth or
different contact force of the
sealing washer
Damaged paint coating on
the back of the base material
Fastener cannot be tight-
ened with the correct torque,
threaded stud does not hold
in the base material.
28 English
Possible cause
Too much driving energy
Piston bent because tool fired
without fastener
Possible cause
Too much driving energy.
The wrong piston has been fitted.
The piston is damaged.
▶ Increase driving energy.
▶ Use a more powerful cartridge.
Driving energy too low
Too much driving energy.
Possible cause
Insufficient drilling depth
Broken or damaged piston
Damaged fastener guide
Damaged protective cap
Misfire
Wrong power setting
Fastening tool dirty.
Fastener is driven too deep.
Foreign matter in drillhole
Supporting steel too thin (<8 mm)
Insufficient drilling depth
Foreign matter in drillhole
Insufficient drilling depth
Action to be taken
▶ Turn the adjusting knob for
driving energy to reduce driving
energy.
▶ Avoid firing the tool without a
fastener loaded.
▶ Check the straightness of the
piston; replace if necessary.
Action to be taken
▶ Turn the adjusting knob for
driving energy to reduce driving
energy.
▶ Make sure that the correct
piston / fastener combination is
used.
▶ Change the piston.
▶ Increase driving energy.
▶ Turn the adjusting knob for
driving energy to reduce driving
energy.
Action to be taken
▶ Make sure drilling depth is
correct (visible ring)
▶ Replace the piston.
▶ Replace the fastener guide
▶ Replace the protective cap
▶ Change the cartridge strip (if
necessary use a new, dry pack),
clean the cartridge strip guide
channel or cartridge chamber,
as applicable
▶ Check the power setting with
the power regulation gauge.
▶ Service the tool.
▶ Reduce driving power (adjust
the power regulation wheel).
▶ Remove liquids, swarf or other
foreign matter from the drillhole.
▶ Drive fasteners only into sup-
porting steel of thickness >8
mm.
▶ Make sure drilling depth is
correct (visible ring)
▶ Remove liquids, swarf or other
foreign matter from the drillhole.
▶ Make sure drilling depth is
correct (visible ring)
377627
*377627*