Troubleshooting - Hilti GX120 Operating Instructions Manual

8.1 Care of the tool 17
CAUTION
Take care not to damage the piston detector, nail
detector and magazine detector.
1. Remove plastic debris from the nosepiece at regular
intervals.
2. Never operate the tool when the ventilation slots are
en
blocked. Clean the ventilation slots carefully using a
dry brush.
3. Do not permit foreign objects to enter the interior of
the tool.
4. Clean the outside of the tool at regular intervals with
a slightly damp cloth.
5. Do not use a spray, steam pressure cleaning equip-
ment or running water for cleaning.

9 Troubleshooting

WARNING
The tool must be unloaded (gas can and fasteners removed from the tool) before carrying out cleaning or maintenance.
Fault
Fastener head stand-off is fre-
quently too high.
The fastener is frequently driven
too deeply (punches through)
and/or the ring or clip breaks.
Fastener breakage.
22
6.
7.
8.
8.2 Maintenance
Check all external parts of the tool for damage at regular
intervals and check that all controls operate faultlessly.
Do not operate the tool if parts are damaged or when
the controls do not function faultlessly. Have the tool
repaired by Hilti Service.
8.3 Checking the tool after care and maintenance
After cleaning or servicing, check that the power regulator
is correctly set (standard setting "+") before inserting the
gas can.
Possible cause
The power regulator is set to "-".
The fastener used is too long.
The base material is too hard.
The intake/exhaust valve is dirty or
covered over.
Driving power is too high.
The fastener is too short.
The power regulator is set to "-".
The fastener used is too long.
The base material is too hard.
The tool is pressed against the sur-
face at an angle.
Always keep the grip surfaces of the tool free from
oil and grease.
Do not use cleaning agents which contain silicone.
Do not use Hilti spray or similar lubricants or cleaning
agents.
Remedy
Set the power regulator to "+".
Use a shorter fastener.
Use a DX fastening tool.
Clean the tool and pay attention to
the hand position.
Contact Hilti if the problem persists.
Set the power regulator to "-".
Use a longer fastener.
Set the power regulator to "+".
Use a shorter fastener.
Use a DX fastening tool.
Hold the tool at right angles to the
working surface. Use the support leg.
See section: 7.5 Support leg