Miller MigMatic 300, Owner'S Manual

Page: 44 / 72

OM-251958 Page 38
SECTION 6 − MAINTENANCE &TROUBLESHOOTING
6-1. Routine Maintenance
.
Maintain more often
during severe conditions.
!
Disconnect power
before maintaining.
n = Check Z = Change ~ = Clean Δ = Repair l = Replace
* To be done by Factory Authorized Service Agent
Every
3
Months
nl Labels
~ Weld Terminals
Every
3
Months
n Δ l Cables And Cords
Every
6
Months
~ :Durning heavy service, clean monthly.
Remove drive roll and
carrier. Apply light coat
of oil or grease to drive
motor shaft.
OR
6-2. Welding Gun And Wire Drive Assembly
1 Welding Gun
Check gun liner for blockage or
kinks.
2
Wire Drive Assembly
Check for jammed wire, binding
drive gear or misaligned drive rolls.
Allow cooling period and reset
breaker. Close door.
956142845_8_14_A
2
1
6-3. Unit Overload
Thermal switches TP4 in SR1 and TP5 in XFMR protect the unit from damage due to overheating. If the thermal indica-
tor illuminates, wait for unit to cool allowing fan motor to run before trying to weld. If unit is cool and no weld output
continues, contact Factory Authorized Service Agent.