Troubleshooting - Hilti GX 90-WF Operating Instructions Manual

8. Make sure that there is no oil or grease on the
battery contacts.
9.2 Tool repair
WARNING
If your tool is damaged, only have it repaired by the
Hilti Service Team.
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.
9.3 Cleaning the tool 11
NOTE
The tool must be cleaned and serviced regularly. We re-
commend that the tool is cleaned, at the latest, after mak-
ing 40,000 fastenings. The tool should also be cleaned
if malfunctions occur frequently, e.g. misfiring or firing
without a nail being driven.
You can arrange for Hilti to carry out the required servicing
work for you. To do so, contact your local Hilti Center or
sales and service office.

10 Troubleshooting

Fault
The tool is fired frequently
without a fastener loaded.
Irregular nail stand-off.
Alternatively, you can do the cleaning service yourself.
The required materials, tools, and documentation are
available from Hilti as accessories. Use only Hilti products
or products of equivalent quality to clean the tool.
9.3.1 Cleaning the piston 12
Dirt and remains of the nail collation strip may hinder
piston movement. Malfunctions occur increasingly, i.e.
the tool is triggered but no fastener is driven. In this case,
the piston should be cleaned as follows:
1.
2.
3.
4.
5.
6.
Possible cause
Working speed is too high.
The tool is not pressed fully against
the working surface and/or the trigger
is not pulled fully.
The tool requires a cleaning service.
Jammed piston (paper, nail or wood
debris in the tool)
The tool requires a cleaning service.
Hard and/or knotty wood.
Empty gas can
Inadequate support / material is resili-
ent.
Working speed is too high.
Remove the battery, gas can and fasteners from the
tool (see section "Unloading the tool").
Use a screwdriver to push the piston back as far as
it will go.
Spray cleaning fluid generously into the tool
nosepiece.
First replace the battery and then the gas can.
Pull the nail pusher back by hand and then trigger
the tool five times, without driving fasteners, with the
tool nosepiece pressed against a suitable surface
(see "Use of the product as directed").
Reload the fasteners and continue working with the
tool in the usual way.
NOTE If necessary, repeat steps 1-6.
Remedy
Observe the maximum nail-driving
frequency (see Technical Data sec-
tion).
Press the tool fully against the work-
ing surface and don't release it until
the nail has been fully driven.
See section: 7.4 Driving nails
Carry out a cleaning service.
See section: 9.3 Cleaning the tool 11
Carry out a piston cleaning service.
See section: 9.3.1 Cleaning the pis-
ton 12
Carry out a cleaning service.
See section: 9.3 Cleaning the tool 11
Change the nails or, if possible, use a
different supporting material.
Insert a new gas can.
See section: 5.2 Preparing the gas
can
See section: 5.2.2 Inserting the gas
can 5
Increase the pressure applied to the
tool and/or the working surface: ad-
opt the optimum working position;
avoid resilient materials.
See section: 7.4 Driving nails
Observe the maximum nail-driving
frequency (see Technical Data sec-
tion).
en
19