Section 7 - Maintenance And Troubleshooting; Routine Maintenance; Unit Overload; Changing Drive Roll And Wire Inlet Guide - Miller Millermatic 252 Owner's Manual

SECTION 7 – MAINTENANCE AND TROUBLESHOOTING
7-1.

Routine Maintenance

Disconnect power before maintaining.
�
Maintain more often during severe conditions.
� = Check
1/2 in.
(13 mm)
Every
3
Month-
s
� Unreadable Labels
Every
6
Month-
s
� Inside Unit
*To be done by factory authorized service agent.
7-2.

Unit Overload

Thermistor RT1 in SCR1 protects the unit from damage due to overheating. If HL.P 002 is displayed on the meters, 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.
7-3.

Changing Drive Roll and Wire Inlet Guide

2
1
allen_wrench allen_set
3
pliers needlenose
OM-230693 Page 32
�
Complete Parts List is available at www.MillerWelds.com
◇ = Change
� Weld Terminals �� Weld Cables
� Apply Light Coat Of Oil � Clean Drive Rolls
Or Grease To Drive Motor
Shaft
4
tools/
flathead
907728
knife steelbrush
OM-278215 Page 33
� = Clean � = Replace
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 prop-
er groove to thread (see Section 5-15).
4 Drive Roll Securing Nut
Turn nut one click to secure drive roll.
philips head wrench
nutdriver
Reference
7/16 in.
crescent wrench
OM-249336 Page 1
chippinghammer