ARMY TM 9-2815-260-24
AIR FORCE TO 38G1-126-2
MARINE CORPS TM 09244A/09245A-24
Check and replace starter components.
Check armature commutator run-out as follows (Refer to Figure 4-21):
FIGURE 4-21. CHECKING COMMUTATOR RUN-OUT
Place armature bearings on V-blocks.
Zero dial indicator on commutator.
Rotate armature and record run-out. Standard is 0.0008 inch (0.02 mm), with a
limit of 0.00197 inch (0.5 mm).
Using a micrometer, measure OD of commutator. If measurement is less than 1.38 inches
(35 mm), replace armature. Refer to Figure 4-22.
FIGURE 4-22. MEASURING COMMUTATOR OD