Operation and maintenance manual
Section 150-0020
SM 2149 5-02
5
Centre Axle - Differential Drive Head
SM - 1196
6. Remove any joint material from the bottom gasket
face of helical gear housing (26).
Differential Unit
1. Match mark straps (89) as shown in Fig. 3 to ensure
correct rebuild position then remove nuts (87) and
washers (88).
2. Lift off both straps (89), adjusting nuts (51) and split
pins (90).
3. Lift complete differential and crownwheel assembly
from gear casing (39). Place assembly on bench with
crownwheel (46) teeth uppermost.
4. Check end flanges (49 & 93) and differential
housing body (48) for identification and matching
marks (See Fig. 4). If unmarked, centre punch parts to
ensure correct mating on assembly.
5. Remove nuts (92) from studs (47) which fasten
upper end flange (93) to differential housing body (48).
6. Lift off end flange (93) and thrust washer (53).
Note: Shims may have been fitted between end flange
(93) and differential housing body (48). These must be
replaced on assembly to maintain an operating
clearance within the differential assembly. The
components contained in the differential unit have been
carefully measured and selected to ensure correct
operation. DO NOT fit the components in a different
sequence to that of the original assembly or attempt to
change/introduce shimming. This will result in failure of
the POWR LOK system.
7. Remove first clutch plate (95) and friction plate (91)
followed by second pair of plates. Set aside plates so that
they can be reinstalled in their original position.
8. Slide out cage half (96) from differential housing
body (48).
9. From remaining cage half (96), lift out wheel (97),
pinions (99) and two piece trunnions (98).
10. Remove second wheel (97) and cage half (96)
followed by two pairs of clutch plates (91 & 95) and
second thrust washer (53).
11. Unscrew and remove nuts (50) and bolts (45).
12. Separate end flange (49) from differential housing
body (48).
Fig. 3 - Match Marking Gear Casing Straps
SM - 1197
4. Inspect helical pinion (31) for wear or damage and
renew if necessary.
5. If renewing inner or outer bearing cones (32A &
30A), drift out the mating cup from gear casing (39) or
helical gear housing (26).
Note: If either bearing cup or cone needs replacing,
they must be replaced as a set.
Fig. 4 - Matching Marks on Diff Housing