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

SECTION 7 − MAINTENANCE &TROUBLESHOOTING

7-1. Routine Maintenance

n = Check
* To be done by Factory Authorized Service Agent
Every
3
Months
l Unreadable Labels
Every
6
OR
Months
~ Inside Unit

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

Tools Needed:
7/16 in.
.
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
~ Clean Drive Rolls
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 5-14).
4 Drive Roll Securing Nut
Turn nut one click to secure drive
roll.
Ref. 804 914-A
OM-230 693 Page 31