Section 4 - Maintenance &Troubleshooting; Routine Maintenance; Circuit Breakers Cb1 And Cb2; Unit Overload - Miller Millermatic 300 Owner's Manual

SECTION 4 – MAINTENANCE &TROUBLESHOOTING

4-1. Routine Maintenance

3 Months
Replace unreadable labels
Clean and tighten weld terminals
6 Months
Blow out or vacuum inside.

4-2. Circuit Breakers CB1 And CB2

1
2

4-3. Unit Overload

If unit is used beyond capacity (excessive wire feed, shorted output, etc.), wire feeds but is not energized. Release gun
trigger to reset this condition.
OM-1317 Page 18
OR
4
Y Disconnect power
before maintaining.
Repair or replace
cracked weld cable
Remove drive roll and
carrier. Apply light coat
of oil or grease to drive
motor shaft.
3
.
Maintain more often
during severe conditions.
1 Circuit Breaker CB2
CB2 protects Remote 14 recep-
tacle RC1 from overload.
2 Circuit Breaker CB1
If CB1 opens, wire feeding stops.
3 Welding Gun (Not Included)
Check gun liner for blockage or
kinks.
4 Wire Drive Assembly
Check for jammed wire, binding
drive gear or misaligned drive rolls.
Allow cooling period and reset
breaker. Close door.
Ref. ST-801 770