TM 9-2920-243-34

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TM 9-2920-243-34c. Shift Housing Assembly.(1) Inspect shift housing for cracks ordistortion and burs on mating flange and packingsurfaces. Replace if damaged.(2) Inspect bushing-type bearing for scoremarks and wear patterns. Check bearing againstlimits specified in repair rebuild standards (para3-31e) and replace (para 3-15c) if worn beyondlimits.(3) If the bushing.type bearing is removedfrom the shift housing, check diameter of bearingbore against limits specified in repair and rebuildstandards (para 3-31e). Replace shift housing ifworn beyond limits.d. Drive Assembly.(1) Inspect bearing surface and driveassembly internal splines for score marks andwear patterns. Replace drive if worn or damaged.(2) Check drive spring against limitsspecified in repair and rebuild standards (para 3-31a) and replace spring if it is not within theselimits.(3) Inspect drive collar for signs of wear anddistortion and replace drive assembly if eithercondition exists.(4) Inspect gear teeth for wear pattern andreplace drive assembly if wear is excessive.e. Brush Holder Assemblies and Brushes.(1) Inspect brush holder and springassemblies for any visible damage. Replace ifdamaged. Check brush spring tension with a 0 to40 ounce spring scale. It should require approximately36 ounces to lift end of spring out ofbrush holder. If tension is less than 30 ounces,replace holder and spring assembly.(2) Inspect brushes for chips, cracks, looseterminal leads, and grease spots. Check length ofbrushes against limits specified in repair andrebuild standards (para 3-31a.). Replace brushesif worn beyond these limits.f. Field Ring Assembly.(1) Check field coils for insulation breakdownwith an ohmmeter. Attach one probe of ohmmeterto field coil terminal and the other probe to fieldring (fig. 3-25). The minimum reading should notbe less than one megohm. If field coils aredamaged, replace starter.(2) Inspect field frame for cracks and burs.Replace starter if cracked.Figure 3-25. Testing field coils for grounds.g. Armature Assembly.(1) Inspect commutator contact surface ofarmature. A satisfactory condition is indicated byan even, highly burnished, dark-copper color. Ifcontact surface is rough, pitted, scored, burned,or coated with hard carbon or oil, commutatormust be cleaned or resurfaced as necessary,provided it is in good electrical and mechanicalcondition as a result of following inspection.Check armature against limits specified in repairand rebuild standards (para 3-31 a) and replacestarter if it is not within these limits. Inspectsplines of armature shaft for wear or damage andreplace starter if either condition exists.(2) Inspect armature for grounds with a testlight by touching one probe to commutator barriser and other to armature core (fig. 3-26). Testall commutator bars in this manner. If test lightglows, armature is grounded and starter must bereplaced.(3) Inspect armature for short circuits with agrowler. Place armature in growler and hold athin strip of steel, such as a hacksaw blade, about1/32 to 1/16-inch away from armature core asshown in figure 3-27. While holding steel strip inposition, rotate armature slowly in growler. Ashort circuit will pull the steep strip tightlyagainst armature core and cause strip to vibrate.If a short circuit is found, starter must bereplaced.3-10
TM 9-2920-243-34(4) Inspect armature shaft alinement andcommutator for eccentricity to shaft with a latheor V-blocks and a dial indicator (fig. 3-28). Checkarmature shaft for true alinement. If shaft runoutexceeds 0.005-inch, commutator of armatureshaft must be resurfaced provided it will not becut below limits specified in repair and rebuildstandards (para 3-31 a). If commutator requirescutting below limits specified, replace starter.Figure 3-27. Testing armature for short circuits.Figure 3-26. Testing armature for grounds.3-11
Page 1: TM9-2920243-34TECHNICAL MANUALDIREC
Page 5 and 6: TM 9-2920-243-34T ECHNICAL M ANUALN
Page 7 and 8: TM 9-2920-243-34CHAPTER 1INTRODUCTI
Page 9: TM 9-2920-243-34A - Fiber thrust wa
Page 12 and 13: TM 9-2920-243-34Table 2-1. Troubles
Page 15 and 16: TM 9-2920-243-34CHAPTER 3REPAIR INS
Page 17 and 18: TM 9-2920-243-34Figure 3-6. Removin
Page 19 and 20: TM 9-2920-243-34Figure 3-13. Disass
Page 21 and 22: TM 9-2920-243-34c. Using an improvi
Page 23: TM 9-2920-243-34c, Remove two guard
Page 27 and 28: TM 9-2920-243-34Figure 3-31. Removi
Page 29 and 30: TM 9-2920-243-34Figure 3-34. Polish
Page 31 and 32: TM 9-2920-243-34d. Remove brushes f
Page 33 and 34: TM 9-2920-243-34clearance. It shoul
Page 35: a. Armature Assembly, Bearings, and
Page 39 and 40: TM 9-2920-243-34APPENDIX BREPAIR PA
Page 41 and 42: TM 9-2920-243-34the quantity incorp
Page 43 and 44: TM 9-2920-243-34n2xB-5
Page 45 and 46: 4ElTM 9-2920-243-34Section III.NbG
Page 47 and 48: TM 9-2920-243-34Figure B-2.B-9
Page 49: TM 9-2920-243-34Section IV. NATIONA
Page 53: TM 9-2920-243-34By Order of the Sec

TM 9-2920-243-34

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