Hilti DX 76 PTR Original Operating Instructions page 30

Fault
Fastener penetrates too deeply
(inadequate fastener stand-off).
en
Fastener doesn't penetrate
deeply enough (excessive
fastener stand-off).
Fastener stand-off (head projec-
tion) varies considerably.
h
Shear breakage.
30
Possible cause
The fastener missed the steel beam.
There is space between the sheet and
the supporting material.
h
The wrong piston has been fitted.
Fastener driven into the rib of the
beam.
Supporting material is too thick, or
the thickness has changed.
h
Fastener driving power is too low.
The tool needs to be cleaned.
The piston is broken.
The tool is damaged.
The wrong piston has been fitted.
The tool was pressed against the
working surface with a jolt.
The tool is cycled unevenly, some-
times not fully.
h
Irregular driving power.
The face of the piston is worn or
chipped.
Fastener driven into the rib of the
beam.
The tool is pressed against the work-
ing surface at an angle.
Supporting material is too thick, or
the thickness has changed.
Remedy
Mark the position of the beam. Drive
another fastener into the beam.
Check to ensure that the sheet rests
tightly against the supporting mater-
ial.
Check that the right combination
of piston and fastener is used.
Use the X‑76‑P‑ENP‑PTR piston
for X‑ENP fasteners. Use the
X‑76‑P‑ENP2K‑PTR piston for ENP2K
fasteners.
Drive a second fastener.
Increase fastener driving power in
accordance with recommendations
or, respectively, use a more powerful
cartridge.
See section: 7.2.2
Increase fastener driving power in
accordance with recommendations
or, respectively, use a more powerful
cartridge.
See section: 7.2.2
Clean the tool.
Change the piston and piston brake.
Contact Hilti.
Check that the right combination
of piston and fastener is used.
Use the X‑76‑P‑ENP‑PTR piston
for X‑ENP fasteners. Use the
X‑76‑P‑ENP2K‑PTR piston with green
mark for ENP2K fasteners.
Press the tool against the working
surface smoothly and avoid jolting.
Cycle the tool fully.
Clean the tool. Replace wearing parts
with new parts. Contact Hilti if irregu-
lar driving power is still experienced.
Change the piston and piston brake.
Drive a second fastener beside the
first one.
Press the tool against the working
surface at right angles.
Check that the recommended type
of fastener is used. If the right type
of fastener is used, increase driv-
ing power in accordance with cart-
ridge recommendations or use a more
powerful cartridge.