Quantcast FIGURE 4-21.  CHECKING COMMUTATOR RUN-OUT - TM-9-2815-259-24_109

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ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 4-29 (13)   Check and replace starter components. (a) Check armature commutator run-out as follows (Refer to Figure 4-21): FIGURE 4-21.  CHECKING COMMUTATOR RUN-OUT (1)     Place armature bearings on V-blocks. (2)     Zero dial indicator on commutator. (3)     Rotate armature and record run-out.  Standard is 0.0008 inch (0.02 mm), with a limit of 0.00197 inch (0.5 mm). (b)     Using a micrometer, measure outer diameter 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


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