TM
5-3431-200-15
Possible remedy
Probable cause
38. Argon Gas Will Not Flow
Idler roll tension too
Adjust the tension of the
Possible remedy
Probable cause
weak.
idler roll (par. 33).
Argon gas cylinder valve
Open the argon gas
cylinder valve.
not open.
42. Argon Gas Leaks
Adjust the argon gas
Argon gas regulator not
regulator (par. 34) or
adjusted or defective.
Possible remedy
Probable cause
replace a defective gas
Tighten the gas connec-
Gas connections loose or
regulator (par. 34).
defective or hose
tions (par. 10) or replace
Gas pipe or solenoid valve Replace defective pipe
hose (par. 49).
defective.
(par. 49) or solenoid
defective.
Solenoid valve defective--------- Replace the solenoid
valve (par. 49).
valve (par. 49).
Gas hose or fittings
Replace defective hose
defective.
Front guide bushing
Replace the front guide
(par. 49), or fittings
worn or defective.
bushing.
Gun barrel ports
Clean the gun barrel ports
Argon gas regulator
Replace the argon gas
clogged.
defective.
regulator (par. 34).
Fitting assembly
Replace the fitting
defective.
assembly (par. 61).
43. Argon Gas Flow Obstructed
39. Welding Gun Shorts Between Nozzle
Possible remedy
Probable cause
and Guide Tube
Solenoid valve defective --- Replace the valve
Possible remedy
Probable cause
Spatter between nozzle
Remove spatter with a file
Gas hose pinched or
Correct condition and
and guide tube.
or scraper.
bent.
straighten hose
Wire feed too slow -------
Adjust the wire feed speed
Gun barrel ports clogged
Clean the ports or replace
Motor fuse blown --------- Replace the motor fuse
or defective.
the barrel (par. 62).
Control assembly ground
Connect the control
44. Welding Set Starts but Fails to
cable not connected to
assembly ground cable to
negative terminal of the
Keep Welding
the negative terminal of
welder.
the welder (par. 10).
Probable cause
Possible remedy
Wire stops feeding - - - - - - - Adjust tension of idler
roller (par. 33) or clean
Wire spool empty ---------bad gun with a full
drive roll (par. 33).
spool (par. 10).
Contactor failure --------- Replace the contactor
40. Wire Feed Speed Too Slow
Probable cause
Possible remedy
Fuses defective ___-____ ---Replace fuses (par. 32).
Rheostat not properly
Adjust rheostat until wire
Rheostat defective -------- Replace the rheostat
adjusted.
feed speed is correct
Resistor defective ---------Replace the resistor
Idler roll tension to great _. Adjust the tension of the
idler roll (par. 33).
Electrical connections
Tighten loose or replace
Wire drive roll dirty or
Service the drive roll
loose or defective.
faulty connections.
damaged.
Welding current relay
Replace the capacitor
41. Wire Feed Speed Too Fast
capacitor defective.
Trigger switch relay
Replace the relay
Probable cause
Possible remedy
defective.
Rheostat not properly
Adjust the rheostat until
adjusted.
wire speed is correct
Power switch defective ---- Replace the switch
Section V. FIELD EXPEDIENT REPAIRS
45. General
operating in the field where supplies and re-
p a i r parts are not available and normal correc-
Operator and organizational maintenance
troubles may occur while the welding set is
tive
action
cannot
be
performed.
When
this
22
