Operation and maintenance manual

SM 2149 5-02
Centre Axle - Differential Drive Head
Section 150-0020
4
5. Insert two 5/8 in UNF bolts into two extractor holes
provided in gear casing flange and tighten to separate
gear casing (39) from axle casing (64).
6. Carefully remove gear casing (39) assembly clear of
axle casing (64) and place on a suitable build stool.
7. Remove all traces of gasket material and sealant
from axle casing (64) and gear casing (39) flanges.
Helical Gear Housing and 3rd Differential
Housing from Gear Casing
1. Remove bolts (119) and washers (118).
2. Insert two 1/2 in UNF bolts into two extractor holes
provided in helical gear housing flange and with
container ready to catch the oil, tighten bolts to
separate helical gear housing (26) from gear casing (39).
3. Carefully lift helical gear housing and 3rd differential
housing assembly from gear casing and place on work
bench, coupling flange (2) uppermost.
4. Remove all traces of gasket material from helical
gear casing and gear casing flanges.
3rd Differential Housing from Helical Gear
Housing
1. Remove setscrews (8), washers (9) and nuts (128).
2. With suitable container ready to catch the oil, lift 3rd
differential housing (10) from helical gear housing (26)
and place on work bench, coupling flange (2)
uppermost.
3. Remove all traces of gasket material from helical
gear housing (26) and 3rd differential housing (10)
flanges. Remove lifting equipment and 'U' bolts from
coupling flange.
DISASSEMBLY
Numbers in parentheses refer to Fig. 1.
WARNING
To prevent personal injury and property
damage, be sure blocking materials and lifting
equipment are properly secured and of
adequate capacity to do the job safely.
When necessary to drive out components
during disassembly, be sure to use a soft drift
to prevent property damage and personal
injury.
3rd Differential Unit
1. Remove flange nut (1) and pull coupling flange (2)
from cage half (12) shaft splines using a suitable
extractor.
2. Unscrew and remove nuts (131) and spring
washers (130).
3. Lift off front end cap (3). Using a suitable drift,
remove and discard oil seal (4). Remove all traces of
gasket material from bearing mounting face in front
end cap (3).
4. Remove washer (5) from cage half (12) shaft splines.
5. Withdraw 3rd differential assembly from 3rd
differential housing (10) by pressing cage half (12)
from bearing (6).
6. Press bearing (6) from 3rd differential housing (10)
and remove all traces of gasket material.
7. Mark two halves of cage half (12 & 17) to ensure
correct rebuild position then remove bolts (126).
8. With cage half (17) on work bench, lift off cage
half (12).
9. Remove thrust washer (13), outer wheel (14), trunnion
and pinion assembly (122, 123, 124 & 125), inner wheel
(15) and thrust washer (16) from cage half (17).
10. Separate thrust washers (125), pinions (124) and
bushes (123) from trunnion (122).
Note: Mark parts of 3rd differential assembly to ensure
correct rebuild position.
Helical Gear Housing
1. Remove cap screws (121) and lift off retainer plate
(18) and shims (19).
2. Lift helical gear housing (26) from helical pinion (31).
3. If bearing replacement is required, use suitable puller
to remove outer bearing cone (30A) and inner bearing
cone (32A) from helical pinion (31).