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Figure 3-7 Connection between steering knuckle and axle
3.1.8 Hub
The hub is used to connect the steering wheel with the steering knuckle assembly. There
are two tapered roller bearings in the hub. The inner ring is mounted on the steering knuckle
body, the outer ring is mounted in the hub, and there is grease in the hub. The steering wheel
is connected with the bolts on the hub through rim.
3.2 Adjusting and fault diagnosis
3.2.1 Pre-tightening adjusting of hub’s bearing
(1) As shown in Fig. 3-8, grease should be added to the inner cavity of hub, hub bearing
and hub cover, and some grease should also be applied to the lip of oil seal.
(2) Install the outer ring of hub bearing on the hub and install the hub on the steering
knuckle assembly;
(3) Add shims and tighten the first round nut. The tightening torque is 206-235N.m
(about 21-24kg.m), loosen the round nut, and then tighten the nut. The torque is 90-100N.m
(9-10kg.m).
(4) Tape the wheel hub lightly with a wooden hammer and rotated by hand for 3-4 turns
to ensure the smooth rotation of the wheel hub. Measure the required torque for the rotation
of the wheel hub. The value is 2.94-7.8N.m (0.3-0.8kg∙m).
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