Lincoln Electric IM10076 LN-25 PRO - Manual (Page 36)

E-3 TROubLEShOOTING E-3
LN-25™ PRO
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
Inconsistent wire feeding or wire not
feeding but drive rolls turning.
Wire feed speed consistently oper-
ates at the wrong value. The speed
changes when the wire feed speed
knob is adjusted.
The wire feed speed stuck at 200-
300 in/min and there is no change
when the wire feed speed knob is
adjusted.
1. The gun cable is kinked and/or
twisted.
2. The wire is jammed in the gun and
cable.
1. The jumper lead for normal
speed/extra torque is connected
improperly.
2. The wrong gear is installed in the
wire drive.
3. The brushes on the motor are
worn.
1. The tachometer is connected
improperly.
2. The tachometer has failed.
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 electrode, 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 elec-
trodes feed well at a tension 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.
1. Properly connect the normal
speed/extra torque jumper.
2. Install the proper pinion gear in
the wire drive.
3. Inspect and replace the motor
brushes.
1. Verify all of the tachometer leads
are properly connected.
2. Replace the motor and tachome-
ter assembly.