Rear Axle Group - Axle Group (Hub)
Section 160-0030
4
SM 1968 4-00
4. Install roller bearing (6) in inner bore of hub (10).
Coat outer diameter of shaft seal (9) with Loctite 574
sealing compound and, with the seal lip facing down,
press shaft seal (9) into the bore of hub (10) with the
special tool shown in Fig. 7. Turn the hub over and
press bearing outer race (8) into the hub bore.
5. With a suitable lifting device, pick up hub (10)
assembly, then, being careful to prevent damaging
the lip of shaft seal (9), slide hub (10) assembly onto
hub carrier (1). Be sure hub (10) assembly is firmly
seated against the shoulder of hub carrier (1).
6. Install bearing inner race (7) on the splined end of
hub carrier (1) as shown in Fig. 8. Be sure the inner
race is firmly seated.
7. Slide ring gear (16) over the splines of hub carrier
(1). Be sure it is pushed all the way in.
8. Select shim (36) and install over the splines of hub
carrier (1) so that front edge of ring gear (16) is
protruding by 0.03 - 0.30 mm (0.001 - 0.012 in).
9. Install slotted nut (29) on hub carrier (1) threads
and, using special tool shown in Fig. 9, tighten slotted
nut (29) to a torque of 1 000 Nm (738 lbf ft).
Note: During tightening the wheel hub must be
spinning.
10. Check the rolling resistance of hub (10) by wrapping
a length of string around hub (10) and pulling with a
suitable scale as shown in Fig. 10. The rolling resistance
(T) should be 12 - 18 Nm (9 - 13 lbf ft) for new bearings,
or 6 - 9 Nm (4.5 - 6.5 lbf ft) for run-in bearings.
Formula to calculate F.
F = T/R
Where:
F = Pull in N (lbf)
T = Rolling resistance Nm (lbf ft)
R = Radius of hub m (ft)
Adjust shim (36) thickness to achieve the correct
rolling resistance. If rolling torque not reached, select
a thinner shim (36). If rolling torque is exceeded,
select a thicker shim (36).
11. When rolling resistance is correct, remove slotted
nut (29).
12. Using Loctite 243, coat the threads of hub carrier
(1) and slotted nut (29). Thread slotted nut (29) on
SM - 1031
SM - 1032
Fig. 8 - Installing Bearing Inner Race
Fig. 7 - Installing Shaft Seal
SM - 1033
Fig. 9 - Tightening Slotted Nut
SM - 1034
F
Fig. 10 - Checking Hub Rolling Resistance
Courtesy of Machine.Market
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