Hilti DX 351 BT, Operating Instructions Manual, Page: 30 / 126

25
en
The operator notices:
■
increased contact pressure
■
increased trigger force
■
power regulation stiff to adjust
■
cartridge strip is difficult to
remove
Fault Possible cause
■
Carbon build-up
Remedy
■
Clean the tool
■
Check that the correct cartridges
are used (see 1.2) and that they
are in faultless condition.
Threaded studs driven to different
depths or sealing washer pres-
sure/contact not constant
■
Hole not deep enough
■
Piston broken or damaged
■
Fastener guide damaged
■
Damaged protective cover
■
Tool misfires
■
Wrong driving power setting
■
Carbon build-up
■
Drill to correct depth
=> visible ring

.
■
Replace the piston.
■
Replace the fastener guide.
■
Replace the protective cover.
■
Change the cartridge strip (take a
strip from a new, dry package if
necessary). Clean the cartridge
strip guideway and cartridge
chamber.
■
Check driving power using the
power regulation guide.
■
Clean the tool.
Damage to the
painted surface on
the underside of the
base material
■
Stud driven too deeply
■
Dirt or foreign matter in the hole
■
Steel base material too thin
(< 8 mm)
■
Hole not deep enough
■
Reduce driving power (power
regulation).
■
Remove liquids, debris, or other
foreign matter from the hole
before installing the stud.
■
Drive studs only on steel base
material
≥
8 mm.
■
Drill to correct depth
=> visible ring

.
Threaded stud doesn’t hold in the
base material when torque is
applied
■
Dirt or foreign matter in the hole
■
Hole not deep enough
■
Hole damaged or previously used
■
Wrong drill bit used
■
Too much torque applied
■
Remove liquids, debris, or other
foreign matter from the hole
before installing the stud.
■
Drill to correct depth => visible
ring

.
■
Drill new hole.
■
Use appropriate drill bit
■
Use appropriate amount of
torque (see 7.2.1 Recommended
torque)
Printed: 20.08.2013 | Doc-Nr: PUB / 5069824 / 000 / 02