TM 9-4940-568-20
2-110
Table 2-19. Wire Feeder Welder Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. WIRE WRAPS AROUND THE FEED ROLLS.
Check for too much pressure on the feed rolls.
Adjust sping control knob on wire feeder.
Check alignment of input and output guides.
Adjust alignment of input and output guides.
Check for correct gun liner and contact tip sizes for welding wire being used.
Replace with correct tip size.
4. WIRE DOES NOT FEED WITH GUN SWITCH DEPRESSED.
Check for continuity of the welding gun trigger leads with the trigger depressed.
If no continuity, repair or replace the welding gun.
Check the gun switch receptacle (J4), terminal strip (TB1), motor fuse (F2), wire feed motor (B1), and plug J1 on
the motor control p.c. board for loose or faulty connections.
If no loose connection(s) are found, replace wire feeder gun.
Check for damaged or blown motor fuse (F2).
Replace fuse.
Make sure the power source output voltage is less than 140 VDC.
Adjust voltage.
5. WIRE FEED MOTOR CONTINUES TO RUN AFTER GUN SWITCH HAS BEEN
RELEASED.
Check for shorted welding gun trigger leads while the gun switch on the welding gun is released.
If shorted, repair or replace the welding gun.
Check for a shorted gun switch receptacle (J4), terminal strip (TB1), or plug J1 on the motor control p.c. board.
If shorted, repair or replace the welding gun.
