ARMY TM 9-2815-260-24
AIR FORCE TO 38G1-126-2
MARINE CORPS TM 09244A/09245A-24
Measure commutator segment mica depth as shown in Figure 4-23. If depth is less than
0.0079 inch (0.2 mm), undercut the mica.
FIGURE 4-23. MEASURING SEGMENT MICA DEPTH
Check commutator surface for burn spots. This usually indicates an open circuit. Remove
these spots using #400 abrasive paper (Refer to Appendix E).
Inspect bearings (34 and 35, Figure 4-10) for wear and damage. If damaged or worn,
replace bearings using a press. Refer to Figure 4-24 for detailed view.
FIGURE 4-24. INSPECTING AND REPLACING BEARINGS