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TM 10-3930-644-14&P
1. Completely deflate the tube assembly. Remove
in the wheel, and press or drive the cups into
valve core from tube.
their bores.  Cups must be square with the
bores, and fully seated at installation.
2. To remove the steer wheel tire, tube and flap,
remove the (6) six bolts, nuts and lockwashers
2. Lubricate the inner wheel bearing cone with
(inside the inner rim) and separate the inner and
specified grease. Use an applicator designed to
outer rims. (See Figure 37.)
force lubricant into the bearing rollers.
CAUTION
3. Position inner beari ng cone on the spindle.
A safety tire rack, cage, or equivalent
Lubricate the bearing cups in the wheel and
protection should be provided and
carefully install the wheel on the spindle.
used when inflating, mounting, or
dismounting tires installed on split
4. Lubricate the outer bearing cone with the
rims, or rims equipped with locking
specified lubricant, using an applicator.  Install
rings or similar devices.
the bearing cone on the spindle.
3. Replace or repair the defective tire, tube or flap
5. install washer and retaining nut on spindle.
and reassemble in reverse order of removal by
While rotating steer wheel, tighten retaining nut
placing tube in tire, then inserting flap; place
to a torque of 50 lb-ft; then back off nut until
inner and outer rims in tire and secure nuts,
loose (0 Ib-ft). Rotate wheel alternately in each
bolts and lockwashers.
direction while tightening retaining nut until a
4. Insert valve core a d inflate tube to specified
n
torque of 25 lb-ft is obtained. Then back off nut
pressure.
300 min to 60 max and install cotter pin.
For good performance and long life, the correct tire
6. Install hub cap and secure with capscrews and
pressure must always be maintained in pneumatic tires.
lockwashers, tightening capscrews securely.
Under-inflation will cause damage to tire cords and may
allow the tires to slip on the rims, tearing out the inner
7. Raise vehicle slightly with the hoist and remove
tube valve stem. Over-inflation will result in excessive
the wooden blocks from under the frame. Then
slippage, causing rapid tread wear. (See Figure 38.)
lower vehicle so steer wheels rest on the floor.
Remove hoist from rear of vehicle.
Air pressure should be checked ever day with an
accurate tire gauge having one pound graduations. Do
E. REMOVAL (PNEUMATIC TIRE)
not allow tire pressures to drop below the recommended
rating. Always be sure that the valve stem caps are in
1. Ensure drive wheels are securely blocked and
place and turned tight by hand.
set parking brake to prevent truck from rolling.
Never use pliers to tighten valve stem caps. The caps
2. Remove the nuts and loc kwashers attaching the
prevent loss of air by keeping out any water or dirt which
rims to the bolts in the wheel hub. (See Figure
could otherwise enter the valve core and cause damage.
37.)
G. TIRE PRESSURE
3. Pull the tire and rim assembly from the hub.
Maximum recommended pressures for pneumatic tires
are as follows:
F. SERVICE - TIRE AND TUBE REPAIR
5.00 x 8" x 6 ply ................................................ 80 p.s.i.
If a tire is excessively worn or badly damaged replace it
6.00 x 9" x 10 ply ............................................ 100 p.s.i.
as follows:
6.50 x 10" x 10 ply........................................... 100 p.s.i.
7.00 x 10" x 10 ply ............................................ 85 p.s.i.
CAUTION
7.50 x 10" x 12 ply .......................................... 100 p.s.i.
Ensure tube has been completely
7.00 x 12" x 6 ply .............................................. 95 p.s.i.
deflated prior to separating rims.
7.00 x 12" x 12 ply .......................................... 100 p.s.i.
7.00 x 15" x 6 ply .............................................. 70 p.s.i.
7.00 x 15" x 12 ply .......................................... 100 p.s.i.
7.50 x 15" x 10 ply ........................................... 95 p.s.i.
8.25 x 15" x 12 ply ......................................... 100 p.s.i.
3-177

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