3-36. MAIN GENERATOR (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
If varnished surfaces of coil insulation are damaged, repair at depot level maintenance facility.
Inspect varnished surfaces of coil insulation.
If bands are loose, repair at depot level maintenance facility.
Check that bands are tight and secure and soldering is intact.
Use a dial indicator and check commutator for roughness or out-of-roundness. Commutator is out-of-round if
there is a 0.002-inch (0.05 mm) variance within a six bar span. Inspect surface for wear, burns, or pitting. If
these conditions exist, resurface commutator by the following:
Grind commutator by the following method:
Remove brush holder and install grinding equipment.
Start diesel engine and run at idle speed. (TM 55-2210-223-12)
Slowly feed grinding stones into commutator until light contact is made.
Run stones across commutator enough to give a uniform surface.
Stop diesel engine. (TM 55-2210-223-12)