JLG 450A_AJ Series II Service Manual - Manual (Page 90)

SECTION 3 - CHASSIS & TURNTABLE
3-50 – JLG Lift – 3121290
9. Remove thrust bearing (15) and thrust washer (14).
Inspect for wear, brinelling, corrosion and a full comple-
ment of retained rollers.
10. Remove seal (16) and back up ring (17) from housing
(18) and backup washer (25). Discard both.
11. Remove housing (18) from vise. Invert housing and
remove seal (20) with a blind hole bearing or seal puller.
Discard seal.
12. Inspect housing (18) assembly for cracks, machined sur-
faces for nicks, burrs, brinelling, or corrosion. Remove
burrs that can be removed without changing dimen-
sional characteristics. Inspect tapped holes for thread
damage. If housing is defective in these areas, discard
housing assembly.
13. If housing (18) assembly has passed inspection to this
point, inspect housing bearings/bushings (19) and (13)
if they are captured in housing cavity. Two thrust wash-
ers (14) and thrust bearing (15) bearing rollers must be
firmly retained in bearing cages, but must rotate and
orbit freely.
All rollers and thrust washers must be free of brinelling
and corrosion. Bushing (19)(13) to coupling shaft diame-
ter clearance must not exceed 0.010 inch (0.025 mm).
A bearing, bushing, or thrust washer that does not pass
inspection must be replaced. If housing has passed this
inspection, disassembly of motor is complete.