Komatsu 830E-AC Shop Manual page 490

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.
4. Wrap a chain and chain binder (2, Figure 3-10)
around the top half of the tire. Secure chain
through the frame. Chain should be tightened
enough to prevent movement during bearing
adjustment procedure when the retainer plate is
removed.
5. Install another chain (3) around the bottom half
of the tire and tighten enough to prevent move-
ment during bearing adjustment procedure.
6. Drain oil at wheel hub drain plug (24, Figure 3-
5). Remove cover (3).
7. Remove cap screws (5), retainer plate (8), and
shims (7).
8. Reinstall retainer plate (with the thickness
dimension stamp facing toward the outside),
cap screws, and hardened washers. Do not
install shims.
9. Remove tire retaining chains (2 & 3, Figure 3-
10).
G3-12
10. Tighten retainer cap screws alternately using
the following procedure:
a. Tighten all cap screws to 81 N·m (60 ft lbs)
b. Increase torque on all cap screws to 163
c. Increase torque on all cap screwcap screws
d. Increase torque on all cap screws to 325
e. Increase torque on all cap screws to 339
FIGURE 3-10. WHEEL SUPPORT CHAIN
1. Suspension Support
11. Loosen all six cap screws just enough until the
flat washers are loose enough to turn (approxi-
mately 1/2 turn) to allow some movement of the
bearing race to release the preload. Rotate the
wheel hub a minimum of three revolutions.
Front Wheel Hub and Spindle
torque while rotating the hub.
N·m (120 ft lbs) while rotating hub.
to 244 N·m (180 ft lbs) while rotating hub.
N·m (240 ft lbs) while rotating hub.
N·m (250 ft lbs) while rotating hub.
INSTALLATION
2. Chain & Binder
Chain 3. Chain & Binder
G03029