SECTION 12
TIRE INFLATION SYSTEM
FIGURE 12-11.
FIGURE 12-12.
between unloader piston guides so its forks are
e. Install the drive belt by turning the
centered on the guides. Install the unloader
variable pulley half on the threads so that the
spring making sure it seats over the spring
drive belt is located in the Vee of the two
pulley halves.
seats both in the block and on the saddle.
NOTE: No further adjustment is necessary
d. install inlet valve seats if they have been
because the variable pulley half acts as
previously removed. Position and install inlet
an adjuster during operation.
valve guides, then drop inlet valves in their
guides. There should be a loose sliding fit
between guides and valves.
f. install the slotted nut and cotter pin on
the compressor crankshaft.
12-36. REASSEMBLY AND INSTALLATION
OF CYLINDER HEAD ASSEMBLY.
12-38. GOVERNOR.
a. Install the discharge valve seats. Drop
12-39.
DESCRIPTION (see figure 12-12).
discharge valves into their seats. install
discharge valve springs and cap nuts.
12-40. The compressor governor is mounted
separately from the compressor. it is bolted to
b. Stick the inlet valve springs in the
the left side frame under the hood, and is
cylinder head. Use a small quantity of grease
connected to the compressor and to the air
to keep the springs from falling out. Place
tanks. It consists of a housing, a spring loaded
cylinder head gasket on cylinder block and
piston and an inlet-exhaust valve.
install capscrews with lockwashers. Tighten
capscrew that holds cylinder head to block
OPERATION (see figure 12-13).
12.41.
securely and evenly.
12-42. When the tank pressure reaches the
12-37. INSTALLATION.
maximum pressure setting, the governor piston
is subjected to sufficient air pressure to
a. Lift the compressor into place.
overcome the spring force. This allows the
mechanism to move up, permitting the exhaust
b. install the mounting capscrews. Torque
stem to close the exhaust valve and to open
them to 50-55 ft.-lbs. (6.91-7.69 kg-m).
the inlet valve. Reservoir pressure then passes
through the governor to operate the compressor
c. Install ail hoses as shown in figure 12-1.
unloading mechanism and hold the intake
valves open to prevent further.compression of
d. Install the keyed pulley half with the
air by the compressor.
threaded hub. Apply molybdenum disuifide dry
film lubricant (aerosol can) to the threads.
12-43. When the reservoir pressure is reduced
12-9.
