Hilti DX 351 M&E Manual page 34

Trouble or fault
Higher force required to press
the tool against the surface
Triggering resistance
increases
Adjusting knob for driving
energy is difficult to turn
Fastening tool cannot be fired Fastening tool was not pressed
The piston jams in the fas-
tener guide
DX 351 MX
The fastener guide in the
magazine jams
28 English
Possible cause
Build-up of combustion residues.
Build-up of combustion residues.
Build-up of combustion residues.
fully against the working surface.
Piston incorrectly installed.
Fastening tool is faulty.
DX 351 MX
The magazine is not loaded.
DX 351 MX
Plastic fragments in the magazine.
DX 351 MX
Incorrect piston position in the
magazine-type fastening tool (pis-
ton not in initial position when firing
triggered)
DX 351 MX
Nails in the magazine are not cor-
rectly positioned.
Fastener guide not correctly
screwed on.
Piston bounce because driving
energy is too high.
Piston and/or piston brake dam-
aged.
DX 351 MX
Plastic fragments in the magazine.
Too much driving energy
Piston bent because tool fired
without fastener
2 fasteners jammed together in the
magazine.
Action to be taken
▶ Service the tool.
▶ Insert new cartridge strip.
▶ Service the tool. → page 27
▶ Contact Hilti Service.
▶ Service the tool. → page 27
▶ Press the fastening tool fully
against the working surface.
▶ Check installation and, if nec-
essary, repeat the installation
procedure. → page 22
▶ Contact Hilti Service.
▶ Load the magazine.
▶ Open the magazine, remove the
nail strip and plastic fragments.
▶ Remove the cartridge strip and
service the tool.
▶ Check piston and piston brake.
→ page 27.
▶ Reload the fastening tool.
▶ Turn the fastener guide until it
engages with an audible click.
→ page 22.
▶ Reduce driving energy.
▶ Check piston brake and piston
for wear; replace the compo-
nents as necessary. → page 27
▶ Open the magazine, remove the
nail strip and plastic fragments.
▶ 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.
▶ Insert the blade of a screwdriver
through the front slot in the
magazine to pry out the
fasteners.
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