92 - 4
Hub-Assembly
1 Fit drive shaft 26 inner end into splines of differential
gears.
2 Fit needle roller bearing 25 and seal 24 into hub carrier
21. Pack grease between the lips of seal 24.
Note: Do not force fit bearing 25 and make sure the
manufacturer’s mark is facing out.
3 Locate hub swivel, aligning relationship lines, assemble
top and bottom trunnions 19 together with trunnion seal
22 and bearing 23. Apply Threadlocker and Sealer to
the threads of bolt 20, torque tighten trunnion retaining
bolts 20 to 98 Nm (72 lbf ft).
4 Lightly oil the inner wheel bearing race. Assemble the
bearing cup and bearing race 17 into the bearing carrier
15.
5 Fit a new combination seal 18 into the bearing carrier
15 so that the chamfer faces the hub swivel. Do not
disassemble seal or use excessive force when fitting.
Do not lubricate before fitting. Use service tool
(892/00891) and spacer to drive the seal squarely into
the carrier until flush.
6 Lightly oil the outer wheel bearing race. Assemble the
bearing cup and bearing race 16 into the bearing carrier
15. Fit bearing carrier assembly onto axle stub.
Note: The bearing carrier must be fully supported during the
fitting operation; do not allow any weight to rest on the
bearings, otherwise the inner bearing will be displaced and
damage the seal.
7 Align relationship marks made on dismantling.
Assemble the annulus ring 13 to the annulus carrier 12.
Secure with circlip 14.
8 Fit annulus assembly in the same angular position as
removal, fit retaining plate 11 using new bolts 10. Do
not fully tighten bolts but allow the bearing carrier to
rock slightly.
Note: Steps 10 to 12 describe measurement of rolling force.
To measure rolling torque (simplified process), a special tool
is required. See Service Tools in this section.
9 Measure seal drag rolling force as follows:
a Refit the planet gear carrier 2 - DO NOT FIT THE
SUN GEAR 8.
b Use a spring balance and cord wrapped around
planet gear carrier 2 as shown. Pull the spring
balance so that the hub rotates, do several times
to let the seal bed in and record the reading.
Remove planet gear carrier 2.
10 Torque tighten bolts 10 evenly to 166 Nm (122 lb ft,
17 kgf).
11 Measure the rolling force as follows:
a Refit the planet gear carrier 2 - DO NOT FIT THE
SUN GEAR 8. Use a spring balance and cord
wrapped around the planet carrier as shown. Pull
the spring balance so that the hub rotates and
record the reading.
b To get the rolling force, subtract seal drag rolling
force (see step 9) from reading obtained at this
step, the result should be 64 to 117N (14 to 26 lbf).
c If the resulting figure is outside these limits, check:
the seal is fitted correctly; and/or renew bearings if
necessary; and/or new fitted components.
Remove planet gear carrier 2.
12 Press the drive shaft thrust pad 6 (chamfered side
lowermost) into the recess in the planet carrier 2.
13 Fit new planet gears 4 in place of any that were
removed.
14 Slide the sun gear 8 (chamfer to be inboard) onto the
drive shaft 26 and secure with circlip 7. Fit a new 'O'
ring 3 in place of the one discarded during dismantling.
15 Fit the planet carrier 2 onto the bearing carrier 15
ensuring that the two tapped holes are in line with
those on the bearing carrier. Fit and tighten screws 1
after applying Threadlocker and Sealer to the threads.
Torque tighten screws to 56 Nm (41 lb ft).
16 Fill hubs with correct grade oil.
Section F Transmission
9803/3280
Section F
92 - 4
Issue 1
Rear Axle - SD80
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