SECTION 12
TIRE INFLATION SYSTEM
malfunctioning, check by connecting a gauge
that is known to be accurate into the air
system next to the faulty gauge. Compare
readings. if the gauge is faulty, replace it.
12-55. QUICK RELEASE VALVE (see figure
12-59. This valve exhausts whenever the air
regulator pressure is set below the existing tire
pressure. If the valve exhausts continually,
check the following:
12-60. Some dirt may be lodged on the valve
seat. if this is the case, let the valve try to seat
several times by operating the regulator valve.
in most cases this will dislodge any dirt
present and allow the valve to close completely
at the proper pressure as indicated on the
FIGURE 12-16.
regulator valve gauge.
b. if leakage persists, check the valve
components for the following:
(1). Broken spring.
(2). Ruptured diaphragm.
(3). Sprung or cracked baffle.
(4). Rough or pitted seats ,in the cover or in
the valve body.
c. Correct items (1) through (3) above by
installing the repair kit. if the valve body or
cover is pitted or scored, replace the complete
unit.
12-61. PRESSURE HOLDING VALVE (See
FIGURE 12-17.
12-62. This valve maintains at least 35 PSI
(2.46 kg/cm2) In the tires in event of a leak in
the air system.
12-65.
TIRE SAFETY VALVE (see figure 12-17).
a. Align the valve leaks between the two
12-66. This safety valve protects the tires from
body halves, tighten the two parts.
over-inflation. Pressure setting can be increased
by turning the adjusting screw clockwise, and
b. if the valve allows air to flow back to the
tank below 35 PSI (2.46 kg/cm2), replace the
towered by turning it counterclockwise. Pres-
sures should be adjusted to the halves in the
internal parts with the repair kit available.
table:
12-63. AIR TANK SAFETY VALVE (see figure
TIRE (PLY)
PRESSURE
45 PSI (3.16 kg/cm2)
4
76 PSI (5.34 kglcm2)
6
12-64. The safety vaIve should be set to 185
100 PSI (7.03 kg/cm2)
PSI (13.007 kg/cm2 ). To increase pressure,
10
120 PSI (8.44 kg/cm2)
12
turn clockwise. Drain tank after each eight (8)
140 PSI (9.84 kg/cm2)
14
hour shift through petcock located at the
bottom of tank.
12-12.
