Lincoln Electric FLEX FEED 74 HT Operator's Manual page 52

FLEX FEED™ 74 HT
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The feeder does not power up - no
voltage, no cold feed.
No shielding gas.
Inconsistent wire feeding or wire not
feeding but drive rolls turning.
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.
POSSIBLE
CAUSE
1. The power source is OFF.
2. The circuit breaker for the wire
feeder on power source have
tripped. (control cable models)
3. The control cable may be loose or
damaged. (control cable models)
1. The gas supply is OFF or empty.
2. The gas hose is cut or crushed.
3. Verify gas is not leaking out
through the gun at the wire drive.
Inspect o-rings.
4. Dirt or debris is in the solenoid.
5. There is a loose solenoid connec-
tion.
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 pressure on the drive
rolls.
8. The spindle brake is too tight.
9. Worn drive roll.
CAUTION
E-2
TROUBLE SHOOTING
RECOMMENDED
COURSE OF ACTION
1. Turn ON the power source.
2. Reset the circuit breakers.
3. Tighten, repair or replace the con-
trol cable.
1. Verify the gas supply is ON and
flowing.
2. Route the gas hose so it avoids
sharp corners and make sure
nothing is on top of it. Repair or
replace damaged hoses.
3. Secure the gun into the wire drive.
Replace o-rings on the gun if nec-
essary.
4. Apply filtered shop at 80psi to the
solenoid to remove dirt.
5. Remove the cover and check that
all connections are in good condi-
tion.
6. Replace the solenoid.
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 pressure knob. Most
electrodes 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.