TM 9-2330-294-14
e. Remove two nuts securing spare tire wheel to tire
The two rear axles are raised by putting the
carrier. Two men must lift spare tire wheel clear of the re-
air control valve handle in NO LOAD (LIFT)
taining bolts and move wheel to the side of the semitrailer.
position.
f. One man must stand on the ground and holding the
(4) Place jack under axle near wheel to be
ends of the rope, take up the slack. While he holds the
removed and raise axle until tire is off the ground
rope tightly, the other man eases the wheel off of the goose-
(5) Remove the 10 hex cap nuts and remove the
neck.
outer wheel assembly from drum.
g. Lower wheel to ground and remove the rope.
NOTE
h. The flat tire wheel can be rolled up either rear ramp
If inner wheel and tire assembly is not to be
and secured to any available tiedown with the rope. After
removed, proceed to (11) below.
the tire is removed from the rear of the semitrailer for repair,
(6) With wheel nut wrench, loosen and remove
stow the rope in the front stowage box.
10 nuts securing inner wheel. These nuts have a
i. After repaired spare is
secured to
tire carrier, torque
square end and are also threaded to take the outer
nuts to 200-250 lb ft.
wheel nuts,
2-26. Changing Wheel and Tire Assembly
(7) Remove the inner wheel assembly from
drum.
a. General. Semitrailers no. 1 through 200 are
(8) Clean all dirt from studs and mating surfaces
equipped with wheels and studs that secure the inner
of hub face and wheel disc.
dual wheel with 10 square end nuts and the outer
CAUTION
dual wheel is secured with 10 hex nuts threaded into
It is important that these surfaces are clean.
the inner nut. The studs and nuts are left-hand
A little dirt between the wheel and drum will
threaded on the left side and right-hand threaded on
vibrate out and cause a loose wheel.
the right side. Semitrailers no. 201 and on are
(9) Mount serviceable inner wheel on studs.
equipped with wheels and studs that secure both the
Install 10 inner wheel nuts. Lift and maneuver
inner and outer dual wheels at the same time with 10
wheel. using wrench handle under tire, while in-
cap nuts. All studs and nuts on semitrailers no. 201
stalling nuts.
and on are right-hand threaded.
CAUTION
b. Changing Wheel and Tire on semitrailer No. 1
The inner wheel nuts cannot be tightened
Through 200.
further once the outer wheel nuts `are at-
NOTE
tached and securely fastened. Therefore, the
If the semitrailer is unloaded, the entire side
inner nuts must be fully tightened before
of the semitrailer may be jacked up as shown
mounting outer wheel and attaching nuts.
(10) Tighten all inner cap nuts slightly to seat
the procedures listed below.
ball faces and insure wheel being centered. Use the
( 1 ) Set semitrailer brakes to prevent movement.
(2) Remove spare tire and wheel from gooseneck
the cap nuts as near as possible to 575-600 pound
foot torque.
(3) Using wheel nut socket wrench (10, fig. B-2)
NOTE
and wrench handle bar (2. fig. B-1) loosen the 10
A rule of thumb used to determine torque
large hex cap nuts securing the outer wheel to be
application without using a torque wrench is
removed.
as follows: A man's weight times the number
NOTE
of feet of leverage equals the pound foot of
Studs on left side of semitrailer are left-hand
torque applied. Apply full weight to wrench
threaded and studs on right s i d e of
handle and bear down hard to obtain proper
semitrailer are right-hand threaded.
torque. If possible use a support under the
NOTE
wrench at the handle end during tightening.
For removing difficult wheel nuts, use
CAUTION
wrench adapter (1, fig. B-1) and crow bar (1,
In a dual-wheel assembly both tires should
be matched in diameter in order to prevent
NOTE
overloading one tire. If the diameter between
The air suspension or air lift system may be
inner and outer tire differs by more than
used to raise axles for changing tires. The
inch or tread depth by inch, tires should
two front axles can be raised by turning
be changed at completion of the mission to
c o n t r o l valve handle to FULL LOAD
obtain a closer match. Notify organizational
position and applying air pressure to the rear
maintenance personnel.
suspension if trailer is without a payload.
Change 1
2-34