HELI G Series Operation & Service Manual page 42

(1) cylinder bore
(6) O ring (7) U ring
3) Hub
The hub is fixed to the steering knuckle shaft with two tapered roller bearing. The
wheels are assembled on the hubs through rims. Oil seal is assembled on the inner side of
the bearing to keep the lubrication oil in the hub and steering knuckle cavity. The nut is
used to adjust the tightness of the nut.
3.5 Adjustment and Maintenance
3.5.1 Rear wheel bearig pre-load adjustment
(1) As shown in Fig. 3-5, fill up the chamber formed by wheel hubs, wheel hub
bearings and wheel hub covers with lubricating grease. Coat the lips of the oil seals with
lubricating grease.
(2) Press the hub bearing into the hub and fit the hub on the knuckle shaft.
(3) Fit a flat washer and tighten a castle nut to a torque of 206-235Nm (21-24kgm)
and loosen it, and then tighten it again to a torque of 9.8Nm (1kgm).
(4) To ensure firm installation of the hub, slightly knock at it with a wooden hammer
and in the meantime, rotate the hub for 3-4turns.
(5) Tighten the castle nut and align one of its notches with a cotter pin hole drilled in
the steering knuckle.
(6) Again slightly knock at the hub with a wooden hammer and in this time, rotate
manually the hub for 3-4turns to ensure its smooth rotation with a specified torque of
2.94-7.8Nm (0.3-0.8kgm).
(7) If the torque value necessary to rotate the hub is more than the specified one
above-mentioned, screw out the castle nut for 1/6 turn and measure the torque value then.
(8) When the torque value measured is up to the specified one, lock the castle nut
with a cotter pin.
(2) supporting ring (3) cylinder cover
(8) dust proof ring (9) retainer ring
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(4) O ring (5) O ring
(10) piston rod assembly