Lincoln Electric 11937 Service Manual page 21

F-7
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The arc is unstable - poor
starting.
Low or no gas flow when gun
trigger is pulled. Wire feed, weld
output and fan operate normally.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELDING PROBLEMS
1. Check for correct input voltage
to the machine.
2. Check for proper electrode
polarity for process.
3. Check gun tip for wear or
damage-Replace.
4. Check for proper gas and flow
rate for process.
5. Check work cable for loose or
faulty connections.
6. Check gun for damage or breaks
GAS FLOW PROBLEMS
1. Check gas supply, flow
regulator and gas hoses.
2. Check gun connection to
machine for obstruction or
leaky seals.
CAUTION
WIRE FEEDER WELDER (180 MODEL)
RECOMMENDED
COURSE OF ACTION
1. Check for 21 to 33 VDC
(dependent on Arc Voltage
Control Setting) at the
machine's output terminals. If
present check gun and work
cable.
2. If OCV is low, check output
capacitor and output diodes.
3. Check for loose connections
at the output terminals, the
choke and all heavy current
carrying leads. See Wiring
Diagram.
4. The Control P.C. Board may
be faulty. Replace.
1. Perform the Gas Solenoid
Test.
F-7