Tweco Hefty II CC CV Voltage Sensing Wire feeder - Manual (Page 34)

Check for too little or too much pressure on the feed rolls.
See spring tension knob in the Description Of Feedhead Assembly section of this
manual.
Check for correct feed roll size for welding wire being used.
Check to see if wire spool tension is too great.
See hub tension bolt in the Internal Controls And Connections section of this manual.
Check for restriction in welding gun and/or contact tip.
Check for correct gun liner and contact tip sizes for welding wire being used.
C. Wire wraps around the feed rolls
Check for too much pressure on the feed rolls.
See spring tension knob in the Description Of Feedhead Assembly section of this
manual.
Check alignment of input and output guides.
Check for correct gun liner and contact tip sizes for welding wire being used.
D. 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), wire feed motor (B1), and plug J1
on the motor control p.c. board for loose or faulty connections.
Check for a locked or shorted motor.
An electronic protection circuit may have activated.
Reset by placing power switch in the off position for at least 60 seconds.
Check wear on motor brushes.
See Feedhead Maintenance in the Maintenance chapter of this manual.
Replace motor control p.c. board if necessary.
E. 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 re-
leased.
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.
Replace motor control p.c. board if necessary.
F. No wire feed speed (WFS) control
Check for a loose WFS control knob.
Check potentiometer (R1) and plug J1 on the motor control p.c. board for loose or faulty con-
nections.
430429-456
TROUBLESHOOTING
June 5, 2000 Revised 7-3