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SECTION 6 − MAINTENANCE &TROUBLESHOOTING
6-1. Routine Maintenance
n = Check
* To be done by Factory Authorized Service Agent
Every
3
Months
l Unreadable Labels
Every
6
OR
Months
~ Inside Unit
6-2. Unit Overload Protection And Tip Saver/Short Circuit Protection
A. Unit Overload Protection
Thermistor RT1 in rectifier SR1 protects the unit from damage due to overheating. If Over Temp light illuminates,
output and wire feed will shut down. Wait until Over Temp light turns off before resuming welding.
B. Tip Saver/Short Circuit Protection
The tip saver/short circuit protection extends contact tip life and protects internal components from damage. If contact
tip is shorted to workpiece, the unit shuts down the welding output, but the fan continues to run. To resume operation,
release gun trigger to reset unit. If the contact tip has stuck to the workpiece, release gun trigger, turn off unit, and
remove contact tip from workpiece. Check contact tip and replace if damaged. Turn on unit to continue operation.
6-3. Changing Drive Roll and Wire Inlet Guide
Tools Needed:
7/16 in.
OM-238 118 Page 28
.
A complete Parts List is available at www.MillerWelds.com
Z = Change
~ = Clean
~ Weld Terminals
n Apply Light Coat Of Oil
Or Grease To Drive Motor
Shaft
2
1
3
!
Disconnect power
before maintaining.
l = Replace
nl Weld Cables
4
.
Maintain more often
during severe conditions.
Reference
1
Securing Screw
2
Inlet Wire Guide
Loosen screw. Slide tip as close to
drive rolls as possible without
touching. Tighten screw.
3
Drive Roll
The drive roll consists of two
different
sized
grooves.
The
stamped markings on the end
surface of the drive roll refers to the
groove on the opposite side of the
drive roll. The groove closest to the
motor shaft is the proper groove to
thread (see Section 4-15).
4
Drive Roll Securing Nut
Turn nut one click to secure drive
roll.
Ref. 804 914-A
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Table of Contents
Troubleshooting
