Lincoln Electric MAGNUM 350 User Manual page 26

E-5
PROBLEMS
(SYMPTOMS)
Low or no shielding gas flow.
Wire feeder runs or begins feeding
wire without pulling the gun trigger.
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.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
PROBLEMS
1. Out of gas.
2. Gas supply is turned off or discon-
nected.
3. Gas supply flow regulator is
improperly set.
4. Machineʼs gas solenoid valve has
malfunctioned.
5. Blockage in gun along gas path.
6. Gun cable kinked or flattened.
7. Blockage due to excessive spatter
accumulation on gas cone or gas
diffuser.
8. Excessive gas leakage from sup-
ply.
10. Gas leakage at gun-to-feeder
connection.
1. Defective trigger, (contacts closed
or dirty).
2. Defective (closed) trigger circuit in
the welding machine.
3. Trigger lead(s) inside gun cable
are shorted together or commonly
shorted to either welding or acces-
sory switch circuits
MAGNUM™ PRO 350 and 550 FUME GUNS
CAUSE
1. Check that an adequate gas sup-
2. Check that all gas supply valves
3. Check that gas flow is set between
4. See machineʼs instruction manual.
5. Gently blow out debris from core
6. Attempt to straighten out cable, or
7. Clean or replace gas cone or gas
8. Find and repair all leaks.
10. Damaged o-rings: replace both
1. Replace
2. See machineʼs instruction manual
3. Damaged control leads along
CAUTION
RECOMMENDED
COURSE OF ACTION
ply is available.
are open.
50 to 70 SCFH.
tube.
replace cable.
diffuser.
seals. Gun connector not fully
inserted into machine. (See
Maintenance Section).
trigger.
Maintenance Section).
cable; repair if
Otherwise, replace gun cable.
E-5
(See
possible.