Miller 300740 Owner's Manual - Page 20

Browse online or download pdf Owner's Manual for Welding System Miller 300740. Miller 300740 32 pages. Mpa drive assembly

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SECTION 6 − MAINTENANCE AND TROUBLESHOOTING

6-1. Routine Maintenance

n = Check

* To be done by Factory Authorized Service Agent

3 Months

l Unreadable Labels

nl Cords

6 Months

~ Drive Rolls

6-2. Brush Inspection And Replacement

Tools Needed:

OM-247517 Page 16

Z = Change

~ = Clean

~ Weld Terminals

nl Gun Cables

~ Inside Unit

Disconnect power

before maintaining.

l = Replace

l Damaged Gas Hose

nl Cracked Parts

1/4 in. (6 mm)

Minimum Length

5/8 in. (16 mm)

New Length

Replace

Damaged

Brushes

Maintain more often

during severe conditions.

nl Weld Cables

Motor

Brush Cap

Remove brush cap.

Brush

Replace brush if it becomes

chipped or broken, or if less than

1/4 in. (6.4 mm) of brush material is

left. Do not include spring boss as

part of the 1/4 in measurement.

Install brush so that curved surface

on end of brush matches curve of

motor, and secure with cap.

Repeat procedure for other brush.

Ref. 137 390-C / S-0816

Reference