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ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 4-30 (c) 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 (d) Check commutator surface for burn spots.  This usually indicates an open circuit. Remove these spots using #400 abrasive paper (Refer to Appendix E). (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


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