TM 5-3895-359-14&P
WHEEL BEARING ADJUSTMENT
a. Tighten the adjusting nut against the ring gear
hub to 100 pound feet while wheel is being rotated.
Rotate the wheel in both directions to make sure
bearings and related parts are fully seated.
b. Back off adjusting nut / turn to relieve pre-load
on bearings.
d. If it is not convenient to remove the wheels of
the vehicle, check the wheel bearing preload torque.
The extension (see inset) permits a reading to be taken
without interference from the tire.
c. If wheel bearings have been replaced with new
by means of a pull scale and cord and advance the
adjusting nut in small increments until the proper
preload is obtained. The proper preload torque is 5 to 9
lb. ft.
NOTE
The above torque specification
allows for the drag of the hub
spindle oil seal. However, if a felt
dust seal is used in the inside of the
brake drum, the torque specifications
should be increased by 5 lb. It. If
wheel bearings are being reused,
e. Bearing preload torque is figured by multiplying
they should be put back in same
the radius (the distance from the center of the wheel to
position as before.
Advance the
the center of the extension) by the reading on the pound
adjusting nut in small increments
scale.
and check rotating torque until an
For Example: Assume the distance from the center of
increase is noted.
If increase is
the wheel to the center of the extension is 9 inches and
the reading on the pound scale is 7 pounds - multiplying
slight, install nut lock in this position
9 inches by 7 pounds, we get 63 pound inches. Since
or back off nut enough to install nut
our preload specifications are listed in pound feet, we
lock. If increase is appreciable, back
simply divide the 63 pound inches by 12 and arrive at a
off nut until increase is only slight or
reading of 5.25 pound feet.
none and then install nut lock, with
This method of converting pound inches to pound feet
two capscrews and lock plate.
also applies to Step "c" above.
5-5