SECTION V. UNIT MAINTENANCE PROCEDURE
4-29. Shaft Bearing and Seal Service.
This task covers:
General Mechanic's Tool Kit
Output shaft removed (see para. 4-26)
Materials and Parts:
GAA Grease, P-D-680 Dry Cleaning Solvent. Rags.
Insert drift (1) into hub (2) thru top hub opening and gently tap
out (on metal exposed part) lower seal (3). Remove lower
bearing cup (4) with lower bearing cone (5).
Leave upper bearing cone and cup and seal in place.
Carefully inspect the drive shaft (6) and the inside of the hub
(2) for any cracks, breaks, bends, visible wear, or general
defects. Rotate bearings to check for rough spots or
symptoms that bearings need replacement. Replace any
Dry cleaning solvent P-D-680 is toxic and flammable.
Wear protective goggles, face mask, and gloves and
use only in a well ventilated area. Avoid contact with
skin, eyes, and clothes, and don't breathe vapor. Do
not use near open flame or excessive heat. The
flashpoint for Type I dry cleaning solvent is 1000F
(380C) and for Type II is 1400F. (600C). If you become
dizzy while using cleaning solvent, get fresh air
immediately and get medical aid. If contact with eyes
is made, flush eyes with water and get medical aid
Wipe excess grease from inside hub (2) with clean rags.
Clean bearings one at a time with solvent and immediately
apply grease. Rotate bearing as you work grease into cone
and cup surfaces.
Install lower bearing cup (4) and lower bearing cone (5) in hub
Use cylinder shape tool on lower seal (3) surface to apply
uniform force and tap seal in place in hub (2).
FOLLOW ON TASKS
Install Output Shaft (para 4-26).
END OF TASK