CASTINGS. - TM-9-2520-270-340071

TM 9-2520-270-34

b. CASTINGS.

(1) Replace all cracked castings or any part with defects that cannot be corrected or which will

impair transmission operation.

(2) Repair minor damage to machined surfaces of castings with crocus cloth (Item 2, App B) or

soft honing stone. Pay particular attention to gasket surfaces.

(3) Repair minor surface bends by working bent surface of casting across sheet of crocus cloth

(Item 2, App B) on surface plate. Replace bent castings which may impair assembly or

operation.

(4) Repair damaged screw threads with correct tap or die.

c. BEARINGS

(1) See TM 9-214 for inspection and maintenance procedures for roller bearings, needle roller

bearings, and ball bearings.

(2) Replace any bearing if defects are found.

d. BUSHINGS AND BUSHING- TYPE BEARINGS. Replace bushings and bushing-type bearings if

they are loose, discolored due to overheating, or scored. When you replace bushings and

bushing-type bearings, check nearby parts for damage or unusual wear.

(1) Removal Press out bushing or bushing-type bearing with suitable arbor press or with special

tools provided.

(2) Installation. Clean repaired parts before assembly or installation. Aline bushing or

bushing-type bearing in casting or retaining cage. Press bushing or bushing-type bearing

into place with suitable arbor press or with special tools provided.

e. THRUST WASHERS AND SHIMS.

(1) Remove minor defects with a crocus cloth (Item 2, App B) or soft honing stone.

(2) Replace parts that are worn, scored, nicked, or deformed.

f. OIL SEALS. Oil seals must be replaced when thin feather edge is damaged or when seal

material is brittle.

(1) Removal Press damaged oil seal from casting. Be careful not to damage bore.

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