Midland SIDE DUMP GRAVEL TRAILER Operator's Manual page 64

5.2.5 WHEEL HUBS/BEARINGS (cont'd)
C. Wheel Bearings:
Wheel bearings carry and transmit the load
between the wheels and the axles. In addition to
proper lubrication, the bearings must have the
recommended pre-load to perform as expected.
Bearing pre-load is set and controlled by the
torque of the wheel nuts on the end of each
spindle. Each hub must seat securely on its
bearings to prevent wobble or stop in the system.
Turning the wheel or wobbling it indicates the
condition and tightness of the hub/bearing
assembly.
Turning/Wobble:
1.
a. Park the trailer on a level, hard
surface and release the
brakes.
b. Place chocks in front of and
behind each wheel.
c. Jack each axle up until the tire
clears the ground.
d. Support the axle on a safety
stand to prevent slipping or
tipping.
e. Turning the wheel slowly to
check the condition of the
bearings and to determine if
the brakes are dragging.
f. Dragging Brakes: Can be felt as a steady
drag on the turning of the wheel or at the
same position or arc or the rotation. Adjust
the brakes to eliminate the drag before
resuming work.
g. Bearing Condition: Can be felt as the
wheel turns. Bearings in good condition
turn easily and smoothly. Bearings in
poor or bad condition can be felt through
the wheels as scraping, grinding, dragging
or bumps. Replace bearings before
resuming work.
h. Wobble: Grasp each side of the wheel
or tire and wiggle the wheel and assembly.
If the wheel or hub wobble on the spindle,
the bearings have lost their pre-load and
the wheel bearing adjusting nut requires
tightning.
52
Fig. 48 WHEELS
If the bearings are not in good
condition, replace them before setting
the pre-load.
NOTE