OIL/GREASE SEALS

TM 9-2520-238-34

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING

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LUBRICATION INSTRUCTIONS -- Continued

Replace bushings and bushing-type bearings if they are loose, scored, or have color change due to heat. When you

replace bushings and bushing type bearings, check nearby parts for damage or wear.

Remove bushings and bushing-type bearings by pressing them out. Use a suitable arbor press or special tools. It

may be necessary to remove bushings in blind holes with a saw, or by using a narrow cap chisel.

Install bushings or bushing type bearings by aligning them in casting or retaining cage. Press bushing or

bushing-type bearings into place with suitable arbor press or with special tools.

45. OIL/GREASE SEALS. Seals must be replaced when seal lip shows signs of wear, brittleness, cracks or damage.

Replace seal if tension spring or seal shell is damaged.

Press damaged oil seal from casting. Be careful not to damage bore.

When oil seal bore is damaged so an oil tight seal is impossible, replace casting or adapter. Remove slight nicks,

burrs, and scratches with crocus cloth dipped in cleaning compound WP 0035 00, Item 4.

Install new oil seal in casting bore or adapter using suitable oil seal replacement tool.

46. PREFORMED PACKINGS AND GASKETS. Preformed packings and gaskets should be replaced when removed

unless otherwise stated in the maintenance task. They should not be reused.

47. INSERTS. Replace insert when threads are stripped or when insert is cracked or loose.

Drill and remove damaged insert from casting.

Install new insert in casting using suitable replacement tool.

48. SPLINED PARTS.

Remove burrs from splined parts with a soft honing stone.

Replace parts that are worn or have twisted, cracked, or broken splines.

NOTE

Chase threads with a used tap or die. A new tap may cut oversize, while a new die may cut

undersize.

49. THREADED PARTS. Repair all parts that have stripped or damaged threads by chasing threads with a used tap or die.

Replace parts that cannot be repaired.

50. RETAINING RINGS.

Retaining rings should be replaced when removed unless otherwise stated in the maintenance task. They should not

be reused.

Some retaining rings are beveled on one side. When installing this type of ring, the beveled side must face the part

to be retained.

51. SPRINGS. Discard springs that have defects. Load and height inspection data, where needed, are given in maintenance

procedures.

52. SHAFTS AND SPINDLES.

Replace shafts and spindles that show signs of wear, binding, scores, cracks, burrs, or clogged oil passages.

Remove obstructions with compressed air or by probing with soft wire.

Remove burrs and minor surface defects with a crocus cloth.

53. ELECTRICAL PARTS.

Replace corroded or burned parts and parts which show signs of mildew.

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