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 TM 10-3930-644-14&P
The following procedure is recommended to
(8) Release press and remove tires. Inspect
replace cushion tires.
new tire and wheel assembly.
(1) Remove wheel and tire assembly from lift
(9) Install wheel and tire assembly on lift
truck.
truck.
(2) Check Inside diameter of new tire.
Remove any signs of scale or rust with
3. Jackshaft Service
sandpaper. Lubricate inside of new tire
with bearing grease.
(3) Place a circular ram on the press table.
The length of the ram must be greater
than the width of the tire to allow complete
removal of the old tire.
The outside
diameter of the ram must be large enough
to rest squarely on the bull gear's flat
surface .
(4) If the outside edge of the wheel is not
flush with the edge of the metal insert in
the old tire, measure how far wheel is
recessed Inside the tire. New tires must
be replaced to the same position as the
Figure 10. Jackshaft Assembly
worn tire was installed on the wheel. A
spacer, slightly smaller in diameter than
The jackshaft is the connection between the
the inside diameter of the tire and the
differential assembly (first reduction) and the bull
same thickness as the depth of the
recess, can be used to obtain the proper
gear in the drive wheel (second reduction). The
amount of recess.
jackshaft is supported by two opposed, tapered
roller bearings; its splined end fits into the differential
(5) Center worn tire and wheel assembly over
and the opposite pinion end drives the wheel
ram. be sure ram and wheel "mate-up"
through the bull gear. To remove the Jackshaft,
squarely.
proceed as follows:
(6) Position new tire on top of wheel and tire
assembly. Align new tire and wheel and
a. Remove wheel. (See WHEEL REMOVAL.)
tire assembly to be concentric with each
other. Make certain the outside of the
b. Remove capscrews which secure the jackshaft
wheel is positioned upwards, because the
dust shield.
outside edge of the wheel has a slight
chamfer to help guide the wheel into the
new tire.
NOTE
The tire can only be installed in one
direction without risking damage to
the wheel.
(7) Start pressing new tire onto wheel and
worn tire off the wheel. Run press slowly
for the first Inches of travel because this is
the critical stage of pressing wheel into
tire. If tire begins co cock, stop press and
realign wheel and tires, a sharp jar with a
mallet will normally realign wheel and tire.
If the wheel is to be recessed in the tire.
stop hydraulic press after the wheel has
been started into the new tire and position
Figure 11. Pulling Jackshaft
the spacer on the inside diameter of the
new tire. The spacer must rest squarely
on the outer edge of the wheel. Continue
pressing new tire onto wheel until tire is
correctly positioned on wheel.
3-139
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