Wheel Bearing Adjustment; Wheel Bearing Adjustment (Tire Mounted) - Komatsu 830E Shop Manual

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 capscrews
(2) with flat washers. Tighten capscrews alter-
nately using the following procedure:
a. Tighten all capscrews to 100 ft. lbs. (135
N.m) torque, while rotating hub (3 revolu-
tions min).
b. Increase torque to 250 ft. lbs. (339 N.m)
torque, while rotating hub (3 revolutions
min).
c. Repeat step b. above until the torque on all
capscrews is maintained.
2. Loosen all six capscrews until the flat washers
are free. Rotate wheel hub (3 revolutions
min).Then select two capscrews 180° apart,
and adjacent to the 0.50 in. (13 mm) diameter
depth measurement holes (refer to Figure 3-9).
Tighten capscrews to 60 ft. lbs. (81 N.m)
torque, while rotating the wheel hub (3 revolu-
tions min).
3. Tighten the same two capscrews to 110 ft. lbs.
(149 N.m) torque, while rotating the hub (3 rev-
olutions min).
4. 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
capscrews tightened in step 2).
5. Add the two dimensions measured in step 4 and
divide the total by 2 to obtain an averaged depth
dimension.
6. Subtract the dimension stamped on the face of
the retainer plate from the average depth estab-
lished in step 5.
7. Assemble a shim pack to equal the dimension in
step 6 within 0.001 in. (0.025 mm).
NOTE: The above procedure results in a shim pack
which will provide a 0.007 in. (0.178 mm) nominal
preload for the bearings.
Shim pack must be compressed when measuring
to obtain an accurate measurement.
8. Remove capscrews and retainer. Install shim
pack and then re-install retainer, all capscrews,
and hardened washers.
9. In successive increments of 250 ft. lbs. (339
N.m) torque, while rotating the hub (3 revolu-
tions min), tighten capscrews alternately to 750
± 75 ft. lbs. (1017 ± 102 N.m) final torque.
G3-8
FIGURE 3-9. BEARING ADJUSTMENT
1. Retainer Plate
2. Capscrews
10. Using a new O-ring (10, Figure 3-5), install cover
(3). Install capscrews and washers (2) and
tighten capscrews to standard torque.
11. Install hub and spindle assembly and add oil per
instructions in "Front Wheel Hub" Installation.

Wheel Bearing Adjustment (Tire mounted)

The following procedure covers adjustment of front
wheel bearings while the tire and rim, hub, and spin-
dle are installed on the truck.
1. Park truck in a level area.
2. Apply the parking brake and block wheels to
prevent movement.
3. Lift the truck until the tire of the wheel being
adjusted is off the ground. Place blocking
securely under truck frame.
NOTE: The placement of binder chains (2 & 3,
Figure 3-10) is necessary anytime that the
retainer plate (8, Figure 3-3) is removed in the
following procedure. These binders must be tight
enough to prevent the wheel hub from moving
out and dislocating the floating seal assembly
(16). An additional chain (1, Figure 3-10) may be
installed to prevent full extension of the
suspension cylinder when the truck is raised off
the ground.
Front Wheel Hub and Spindle
3. Depth Measurement
Hole
04/03 G03018