E-3
TROUBLESHOOTING
E-3
LN-25™ PRO DUAL POWER
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 feeder does power up - no display, no
cold feed.
The wire feeder power up but there is no out-
put when the trigger is pulled. The shielding
gas is flowing and the drive rolls turn.
No shielding gas.
Inconsistent wire feeding or wire not feeding
but drive rolls turning.
1. The work sense lead is disconnected or is
a poor electrical connection. (Across the
arc models)
2. The power source is OFF.
3. The circuit breaker for the wire feeder on
power source have tripped. (control cable
models)
4. The control cable may be loose or dam-
aged. (control cable models)
1. The contactor coil connections are loose.
2. The contactor has failed.
1. The gas supply is OFF or empty.
2. The gas hose is cut or crushed
3. The flow meter valve is closed.
4. Dirt or debris is in the solenoid.
5. There is a loose solenoid connection.
6. The solenoid has failed.
1. The gun cable is kinked and/or twisted
2. The wire is jammed in the gun and cable.
3. The gun liner is dirty or worn.
4. The electrode is rusty or dirty.
5. The contact tip is partially melted or has
spatter.
6. Improper gun liner, tip, drive rolls and/or
inner wire guide.
7. Incorrect tension arm pressure on the drive
rolls.
8. The spindle brake is too tight.
9. Worn drive roll
1. Connect the work sense lead to the work in
a location free of dirt, rust and paint.
2. Turn ON the power source.
3. Reset the circuit breakers.
4. Tighten, repair or replace the control cable.
1. Verify the contactor coil connections.
2. Replace the contactor.
1. Verify the gas supply is ON and flowing.
2. Route the gas hose so it avoids sharp cor-
ners and make sure nothing is on top of it.
Repair or replace damaged hoses.
3. Open the flow meter valve.
4. Apply filtered shop at 80psi to the solenoid
to remove dirt.
5. Remove the cover and check that all con-
nections are in good condition.
1. Keep the gun cable as straight as possible.
Avoid sharp corners or bends in the cable.
2. Remove the gun from the wire feeder and
pull the jammed wire out of the gun and
cable.
3. Blow dirt out of the liner with low pressure
(40psi or less). Replace the liner if worn.
4. Use only clean electrode. Use quality elec-
trode, like L-50 or L-56 from Lincoln
Electric.
5. Replace the contact tip.
6. Verify the proper parts are installed.
7. Adjust the tension arm per the Instruction
Manual. Most electrodes feed well at a ten-
sion arm setting of "3".
8. Verify the spool of wire moves with minimal
effort.
9. Replace the drive rolls if worn or filled with
dirt.
Output Problems
