Komatsu 830E-AC Shop Manual page 489

Wheel Bearing Adjustment (Tire Removed)
1. Install bearing retainer (1, Figure 3-9), without
shims, with the thickness dimension stamp fac-
ing toward the outside. Install all six cap screws
(2) with flat washers. Tighten cap screws alter-
nately using the following procedure:
a. Tighten all cap screws to 135 N·m (100 ft
lbs) torque, while rotating hub (3 revolutions
min).
b. Increase torque to 339 N·m (250 ft lbs)
torque, while rotating hub (3 revolutions
min).
c. Repeat step b. above until the torque on all
cap screws is maintained.
2. Loosen all six cap screws until the flat washers
are free. Rotate wheel hub (3 revolutions min).
3. Then select two cap screws 180° apart, and
adjacent to the 13 mm (0.50 in.) diameter depth
measurement holes (refer to Figure 3-9).
Tighten the two cap screws to 81 N·m (60 ft
lbs) torque, while rotating the wheel hub (3 rev-
olutions min). Tighten the two cap screws again
to 81 N·m (60 ft lbs) torque.
4. Tighten the same two cap screws to 149 N·m
(110 ft lbs) torque, while rotating the hub (3 rev-
olutions min).
5. Using a depth micrometer, measure and record
the depth to the end of the spindle from the face
of the retainer plate (1) through each of the two
holes (3) in the retainer plate (adjacent to the
cap screws tightened in step 2).
6. Add the two dimensions measured in step 4
and divide the total by 2 to obtain an averaged
depth dimension.
7. Subtract the dimension stamped on the face of
the retainer plate from the average depth estab-
lished in step 5.
G03029
8. Assemble a shim pack to equal the dimension
in step 6 within 0.025 mm (0.001 in.).
NOTE: The above procedure results in a shim pack
which will provide a 0.178 mm (0.007 in.) nominal
preload for the bearings.
Shim pack must be compressed when measuring
to obtain an accurate measurement.
9. Remove cap screws and retainer. Install shim
pack and then re-install retainer, all cap screws,
and hardened washers.
10. In successive increments of 339 N·m (250 ft
lbs) torque, while rotating the hub (3 revolutions
min), tighten cap screws alternately to 1017 ±
102 N·m (750 ± 75 ft lbs) final torque.
FIGURE 3-9. BEARING ADJUSTMENT
1. Retainer Plate
2. Cap Screws
11. Using a new O-ring (10, Figure 3-5), install
cover (3). Install cap screws and washers (2)
and tighten cap screws to standard torque.
12. Install hub and spindle assembly and add oil per
instructions in Front Wheel Hub Installation.
Front Wheel Hub and Spindle
3. Depth Measurement
Hole
G3-11