(2) Remove the two end cover screws and pull end cover off generator.
(3) Clean armature commutator with No. 00 sandpaper until bright and clean. Blow out with air. CAUTION: Do not remove or disturb brushes in their holders. Never use emery cloth to clean the commutator.
RA PD 310260
Figure 57—Generator End Cover and Grease Retainer Removed
(4) Temporarily install footboard assembly and operate engine, to observe whether or not generator is charging (green signal light goes off at above 20 mph). If cleaning commutator does not remedy generator charge, and/or commutator is badly worn, then generator must be replaced (par. [93]). If cleaning of commutator remedied generator charge, reinstall generator end cover, and the footboard and clutch pedal assembly (par. [102 b]).
92. ARMATURE BEARING SPECIAL LUBRICATION ([fig. 57]).
a. At the 6,000–mile second echelon preventive maintenance service period, the commutator end bearing must be hand‐packed. In performing this operation, care must be taken not to shift or move the generator third (regulating) brush, thus disturbing generator current regulation. Generator drive end bearing is adequately lubricated by oil circulating through engine.