Lincoln Electric IM872 LF-74 WIRE FEEDER - Manual (Page 42)

E-2 TROUBLESHOOTING E-2
LF-74
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
The wire feeder does not feed wire
and the drive rolls do not spin.
The wire feeds erratically, or the
Motor Thermal LED lights.
The wire continues to feed when the
trigger is released.
No shielding gas
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. Check that the gun trigger is
operating properly.
4. If the motor thermal LED is illumi-
nated, wait approximately 1
minute before welding again.
Inspect the gun for feeding prob-
lems.
5. 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.
3. Examine the contact tip for wear
and proper size. Replace as nec-
essary.
4. Check the gun liner. The welding
electrode should slide easily
through the gun.
5. Verify the proper gun liner is
installed.
6. Adjust the pressure arm.
7. On bench models, make sure the
brake tension is not too tight.
8. If using a wire conduit, verify the
wire slides easily through the
conduit.
1. Check if the 2 step/Trigger
Interlock switch is in the TRIG-
GER INTERLOCK position.
2. Verify operation of the gun trig-
ger.
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.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
OUTPUT PROBLEMS