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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.
(9) Install wheel and tire assembly on lift
(1) Remove wheel and tire assembly from lift
truck.
truck.
(2) Check inside diameter of new tire.
3. Jackshaft Service
Remove any signs of scale or rust with
sandpaper. Lubricate inside of new tire
with bearing grease.
(3) Place a circular ram on the press table.
The length of the rim 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 me same position as the
worn tire was installed on the wheel. A
spacer, slightly smaller in diameter than
the inside diameter of the tire and the
same thickness as the depth of the
Figure 10. Jackshaft Assembly
recess, can be used to obtain the proper
amount of recess.
The jackshaft is the connection between the
(5) Center worn tire and wheel assembly over
differential assembly (first reduction) and the bull
ram, be sure ram and wheel "mate-up"
gear in the drive wheel (second reduction). The
squarely.
jackshaft is supported by two opposed, tapered
(6) Position new tire on top of wheel and tire
roller bearings; its splined end fits into the
assembly. Align new tire and wheel and
differential and the opposite pinion end drives
tire assembly to be concentric with each
the wheel through the bull gear. To remove the
other. Make certain the outside of the
jackshaft, proceed as follows:
wheel is positioned upwards, because the
outside edge of the wheel has a slight
a. Remove
wheel.
(See
WHEEL
chamfer to help guide the wheel into the
REMOVAL.)
new tire.
b. Remove capscrews which secure the
jackshaft dust shield.
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 to 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
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
Figure 11. Pulling Jackshaft
correctly positioned on wheel.
2-67
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