SECTION V. UNIT MAINTENANCE PROCEDURE
4-28. Shaft Bearing and Seal Replacement.
This task covers:
General Mechanic's Tool Kit.
Output shaft removed (see para. 4-26).
Materials and Parts:
Seals, Bearings cones, Bearing cups, GAA Grease, Rags, P-D-680 Solvent.
Insert drift (1) into hub (2) thru bottom hub opening. Gently tap
around metal exposed edge of upper seal (3) until seal comes out.
Remove upper bearing cup and cone (4).
Insert drift (1) into hub (2) thru top hub opening. Gently tap around
metal exposed edge of lower seal (5) until seal comes out.
Remove bottom bearing cup and cone (6).
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 dry
cleaning solvent is 1000F (380 C) and for Type II is 1400 F.
(600- C). 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
Carefully clean output shaft (7) and inside of hub (2). Inspect for
any cracks, breaks, bends, visible wear, or general defects.
Replace any defective parts.
Install lower bearing cup and lower bearing cone (6) in hub (2).
Use cylinder shape tool on lower seal (5) to apply uniform force and
tap lower seal in place in hub (2).
Install upper bearing cup and upper bearing cone (4) in hub (2).
Use cylinder shape tool on upper 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