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E-2
PROBLEMS
(SYMPTOMS)
The wire feeder does not feed wire
and the drive rolls do not spin.
The wire feeds erratically.
No shielding gas
Variable or "hunting" arc.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
1. Verify the power source is turned
on.
2. Verify the circuit breaker for the
wire feeder on the power source
has not tripped.
3. Verify power is being supplied to
the wire feeder.
1. Verify the correct drive rolls and
inner wire guide are installed in
the wire drive.
2. Check for sharp bends in the gun
liner or conduit.
3. Examine the contact tip for wear
and proper size. Replace as nec-
essary.
4. Check the gun liner and conduit.
The welding electrode should
slide easily through both.
5. Verify the proper gun liner is
installed.
6. Verify the pressure arms are set
properly. Too much pressure may
crush the wire.
7. Inspect the motor for worn brush-
es.
1. Verify the gas supply is turned on
and not empty.
2. Check the gas hose for cuts.
Make sure it is not crushed.
3. Verify the shielding gas hose is
connected to the gun bushing or
welding gun.
AutoDrive 4R90
CAUSE
CAUTION
RECOMMENDED
COURSE OF ACTION
E-2
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