Miller Electric S-21E, Technical Manual

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2. Remove brushes.
3. Examine brushes. Replace brushes if they are
chipped or broken or if less than 1/4 in. (6.4 mm)
of brush material remains.
4. Install brushes, and secure with caps.
10-5. OVERLOAD PROTECTION
Circuit breaker CBl provides protection to the feeder
circuits. CBl is located towards the front of the unit, be-
hind the left case access door. Ifthe motor should over-
load or the circuit fail, the breaker would trip and shut
down the wirefeeder. If CB1 opens, correct the problem
and manually reset the breaker.
To reset CBl, proceed as follows:
1. Unlatch and open left case access door.
2. Locate CBl, and reset (see Figure 4-1).
3. Close and secure left case access door.
S-21E
TM-1571 Page 27