Lincoln Electric MAGNUM 300FM - Manual (Page 20)

TROUBLESHOOTING
MAGNUM® FAST-MATE™
Observe all Safety Guidelines detailed througout this manual
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.
CAUTION
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE CAUSE
RECOMMENDED
COURSE OF ACTION
3. Poor arc striking with sticking or
“blast-offs”, weld porosity, narrow
and ropy looking bead, or elec-
trode stubbing into plate while
welding.
4. Tip seizes in diffuser.
A. Improper procedures or tech-
niques.
B. Improper gas shielding.
A. Tip overheating due to prolonged
or excessive high current and/or
duty cycle welding.
A. See “Gas Metal Arc Welding
Guide” (GS-100).
B. Clean gas nozzle. Make certain
that gas diffuser is not restricted.
Make certain that gas cylinder is
not empty or turned off. Make
certain gas solenoid valve is
operating and gas flow rate is
proper.
Remove gun liner and check
rubber seal for any sign of de-
terioration or damage. Be sure
set screw in brass connector is
in place and tightened against
the liner bushing.
A. Do not exceed current and duty
cycle rating of gun.
A light application of high tem-
perature antiseize lubricant (such
as Lincoln E2067 Graphite
Grease) may be applied to tip
threads.
E-3 E-3