TM 5-4320-302-145-19.ALTERNATOR (CONT)Location/ItemActionRemarks21. Columix andInspect for gouged or discolored windings.rotorDiscoloration of winding insulation indicates anoverheated columix or rotor that may result in shorted orgrounded windings.22. Rotor slipInspect for cracks, wear grooves, or other damage.ringsRestore a smooth surface to the slip rings with P-C-458crocus cloth. Reclean with P-D- 680 solvent and wipeall residue from slip rings.23. Rotor shaftInspect shaft for stripped threads, cracks, wear,and bodyor other damage. Inspect body for cracked or marredpole fingers. Replace rotor if damaged.24. All other partsInspect for cracks, distortion, or damaged threads.Replace damaged parts.TEST25. RotorSet multimeter to resistance scale, touch probestogether, and adjust OHMS ADJUST for zero resistance.Place a probe on each slip ring. A reading of zeroresistance indicates a short circuit in rotor winding;replace rotor. A reading of infinite resistance indicatesan open circuit in rotor winding; replace rotor. Place onetest probe on one of the slip rings and the other probeon a rotor pole finger. The multimeter should indicateinfinite resistance. If anything less than infiniteresistance is indicated, replace rotor.5-69
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