MAINTENANCE OF AIR BRAKE SYSTEM - Continued
HUBS AND DRUMS - Continued
If bearing cup is damaged precede to step 14. If no damage present proceed to step 15.
(14) Turn unit so hub is down. Using brass drift, drive out bearing cup (12).
(15) Only remove back nuts (13) and drum (15) from hub (7) if studs (16) are damaged.
(16) Remove studs (16) from hub (7) only if damaged.
Wear safety glasses when removing or installing force fitted parts. Failure to comply may result in
serious eye injury.
Dry-cleaning solvent (P-D-680) used to clean parts is potentially dangerous to personnel and property.
Do not use near open flame or excessive heat. Flash point of dry-cleaning solvent is 138F (59C).
(1) Clean all parts thoroughly using a brush and dry-cleaning solvent. Allow to air dry.
(2) Clean spindle (17) on axle (18) with wiping cloth.
(1) Inspect bearings visually for wear and scoring flat spots and overheating (discoloration).
(2) Inspect brake drum visually for deep scoring, excessive wear (ridge) and other
irregularities. Replace as needed.
(3) Inspect hub cap, nuts, lock and hub for cracks and other damage.
(4) Inspect spindle for damaged threads, evidence of seizure and rough surfaces. Report
condition to Direct Support Maintenance.
d. Repair. Replace all gaskets, seals and defective parts.
(1) Install studs (16) in hub (7) if removed.
(2) If removed, install inner bearing cup (11) in hub (7), with narrow edge outward. Seat with