Operating Instruction DX 76 (01)

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Fault Possible cause Remedy
Fastener penetrates too deeply
(inadequate fastener stand-off).
The fastener missed the steel beam. Mark the position of the beam. Drive
another fastener into the beam.
Check to ensure that the sheet rests
tightly against the supporting mate-
rial.
The wrong piston has been fitted. Check that the right piston / fastener
combination is used.
The piston is worn. Change the piston and piston stop-
per.
Fastener doesn’t penetrate
deeply enough (excessive fas-
tener stand-off).
Fastener driven into the rib of the
beam.
Drive a second fastener.
Different thickness and/or strength of
supporting material.
Increase fastener driving power in
accordance with recommendations
or, respectively, use a more powerful
cartridge.
Fastener driving power is too low. Increase fastener driving power in
accordance with recommendations
or, respectively, use a more powerful
cartridge.
The tool needs to be cleaned. Clean the tool.
The piston is worn. Change the piston and piston stop-
per.
The tool is damaged. Contact Hilti.
The wrong piston has been fitted. Check that the right piston / fastener
combination is used.
Fastener stand-off (head projec-
tion) varies considerably.
The tool was pressed against the
working surface with a jolt.
Press the tool against the working
surface smoothly and avoid jolting.
The tool is cycled unevenly, some-
times not fully.
Cycle the tool fully.
Irregular driving power. Clean the tool. Replace wearing parts
with new parts. Contact Hilti if irregu-
lar driving power is still experienced.
Shear breakage. The face of the piston is worn or
chipped.
Change the piston and piston stop-
per.
Fastener driven into the rib of the
beam.
Drive a second fastener beside the
first one.
The supporting material is thicker
and/or of higher strength.
Check that the recommended type
of fastener is used. If the right type
of fastener is used, increase driv-
ing power in accordance with car-
tridge recommendations or use a
more powerful cartridge.
The tool remains compressed
(doesn’t extend when pressure
is released).
The piston sticks in the piston stop-
per.
Change the piston and piston stop-
per.
The tool is badly fouled with dirt and
residues.
Clean the piston guide. Check the
straightness of the piston.
Clean the tool.
See section: 8.2.2 Cleaning the piston
guide    
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Printed: 17.04.2014 | Doc-Nr: PUB / 5126040 / 000 / 02