TM 9-2330-235-14&P
4-40. HUB, WHEEL BEARINGS, AND BRAKEDRUM MAINTENANCE (M514) (Con't).
3. Remove hub (12) and brakedrum (17) assembly from suspension arm (13).
4. Remove outer bearing (9) from hub (12).
5. Remove retaining ring (14), oil seal (15), and inner bearing (16) from hub (12). Discard oil seal.
6. Remove six nuts (11) and screws (19). Separate brakedrum (17) from hub (12).
7. Remove two bearing cups (10 and 18) from hub (12).
b. CLEANING AND INSPECTION
WARNING
DO NOT handle brakeshoes, brakedrums, or other brake components unless area
has been properly cleaned. There may be asbestos dust on these components
which can be dangerous if you touch it or breathe it. Wear an approved filter
mask and gloves. Never use compressed air or a dry brush to clean brake
components. Dust may be removed using an industrial-type vacuum cleaner.
Clean dust or mud away from brake components with water and a wet, soft brush
or cloth. Failure to follow this warning may result in serious illness or death to
personnel.
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid Contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. The solvent's flash point is 100F-138F (380C-590C). If
you become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent Contacts eyes, immediately wash your eyes and get
medical aid.
1. Use dry cleaning solvent to remove grease and oil from all metal parts. Dry thoroughly.
2. Clean and inspect bearings and bearing cups in accordance with TM 9-214.
3. Inspect brakedrum and hub for cracks or other signs of damage.
4. Inspect braking surface of brakedrum for scoring, heat checking, or uneven wear.
c. ASSEMBLY AND ADJUSTMENT
1. Press bearing cups (10 and 18) into hub (12) until squarely seated on shoulders.
2. Install brakedrum (17) on hub (12) with six screws (19) and nuts (11).
3. Pack inner and outer bearings (16 and 9) with grease in accordance with TM 9-214.
4. Install inner bearing (16) and new oil seal (15) in inner end of hub (12). Secure with retaining ring (14).
5. Install hub (12) and brakedrum (17) assembly on suspension arm (13).
6. Install outer bearing (9), keywasher (8), and nut (7) with flat side in.
7. While rotating hub (12) and brakedrum (17), tighten nut (7) until a distinct drag is felt Loosen nut until hub and
brakedrum turn freely.
4-96