REPAIR - TM-9-2520-238-340070

TM 9-2520-238-34

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING

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LUBRICATION INSTRUCTIONS -- Continued

33. SPLINED PARTS. Inspect splined parts for burrs, wear, and twisted, cracked or broken splines.

34. THREADED PARTS. Inspect all threaded parts for burrs, and stripped or damaged threads.

35. RETAINING RINGS. Inspect retaining rings for nicks, burrs, defects, loss of tension, or wear.

36. SPRINGS. Inspect springs for wear, defects, breaks, and loss of tension or compression. Inspect springs using a spring

tester.

37. SHAFTS AND SPINDLES. Inspect shafts and spindles for excessive wear, binding, scores, cracks, burrs, and

obstructed oil passages.

REPAIR

38. GENERAL. General repair procedures are given in the following steps. Special repairs are covered in the task. After

repair, clean all parts well.

39. CASTINGS.

Replace all cracked or broken castings.

Repair minor damage to machined surfaces of castings with crocus cloth. Replace any part with defects that cannot

be corrected or which will impair function.

Repair minor surface bends by working bent surface of casting across sheet of crocus cloth on surface plate.

Replace bent castings which would impair assembly or function.

Repair damaged pipe or screw threads with correct tap or die.

40. BALL BEARINGS. See TM 9-214 for inspection and maintenance of ball bearings.

41. NEEDLE ROLLER BEARINGS. See TM 9-214 for inspection and maintenance of needle roller bearings.

42. STUDS.

Replace all bent or loose studs, or studs which show signs of stretching.

Repair minor thread damage with standard thread chaser.

To remove studs, back out studs slowly with stud extractor to avoid heating and possible seizure. If studs are

broken too short to use extractor, drill and extract studs with suitable remover. A short stud may be removed by

welding nut to stud and removing with wrench.

To replace studs, lightly apply antiseize compound to stud before you install it. Only standard studs are supplied

for repair parts. If threaded hole is damaged beyond repair, drill and tap damaged hole. Install threaded insert in

tapped hole.

43. GEARS.

Replace gears that have worn, pitted or gouged teeth.

Remove sharp burrs from gear teeth with crocus cloth dipped in cleaning compound WP 0035 00, Item 4.

CAUTION

Damaged housing bore can cause equipment failure. Do not damage housing bore when cutting

bushings.

NOTE

Do not remove bushings and bushing-type bearings unless replacement is necessary and

authorized. Removal usually damages these parts.

44. BUSHINGS AND BUSHING-TYPE BEARINGS.

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