TM 9-2330-384-14&P
4-47. WHEEL BEARING CHECK AND ADJUSTMENT.
THIS TASK COVERS
a.
Wheel Bearing Check
b.
Wheel Bearing Adjustment
INITIAL SETUP
Equipment Conditions:
Materials/Parts:
Conditions
One cotter pin
Ref
One preformed packing
Lubricating oil
Tools:
Tool kit, general mechanic's
in. wheel bearing adjusting nut wrench,
8 pt.
in. wheel bearing adjusting nut wrench,
6 pt.
Drain pan
Floor jack
Jackstand
Pry bar
WHEEL BEARING CHECK
a.
(1)
Place a suitable floor jack under axle in front of brake chamber and raise wheels clear of
ground. Support axle with a suitable jackstand.
(2)
(3)
Turn wheels and note whether they turn hard. If wheels turn hard, perform WHEEL BEARING
ADJUSTMENT (subparagraph b).
(4)
Test for excessive wheel wobble:
(a)
Rest one end of pry bar (6) on floor under tire (7) and lift up on tire. Move pry bar up and
down while holding one hand against top of outer tire. if wheel bearings are adjusted
correctly, movement of wheels will be barely visible and will turn freely with no drag.
(b)
If there is excessive wheel wobble, perform WHEEL BEARING ADJUSTMENT (subpara-
graph b).
b. WHEEL BEARING ADJUSTMENT
(1)
Remove jackstand and lower wheels to ground. Loosen hubcap (4) turn. Raise wheels
again and support axle with jackstand.
(2)
Place a drain pan under hubcap (4). Remove hubcap and allow all lubricating oil to drain.
Remove preformed packing (3) from hubcap and discard.
NOTE
General condition of outer wheel bearing may be inspected at this time. if
contamination or damage is found, service wheel bearings (see paragraph
(3)
Remove cotter pin (1) from axle nut (2) and discard.
4-152