TIRE INFLATION SYSTEM
removed from body, new filters should be
c. Drop inlet and exhaust valve into place at
bottom of piston.
PRESSURE REGULATING VALVE (see
d. install inlet valve spring with narrow end
against valve. Press down until large colled
end snaps into groove inside piston.
12-63. Before starting the engine, back off the
e. Position exhaust stem spring over exhaust
a d j u s t i n g handle on the dash by turning
stem and carefully press stem into stem bore
counterclockwise until it turns freely. This
releases all compression on the regulating
spring.Run engine to build up maximum tank
1. install piston in governor body.
pressure of 150 PSI (10.66 kg/cm2). Turn the
handle clockwise until the gauge shows the
g. install one (1) lower spring seat, spring
desired tire pressure. If this pressure is not
guide, the other lower spring seat, pressure
immediately available, continue to turn handle.
setting spring and hex-shaped upper spring
As the gauge reading nears the desired
seat on adjusting screw.
pressure, turn the handle back until the needle
h. Screw upper spring seat down until
will continue to fill the air tank until the
dimension from top of seat to bottom of stem
head is approximately 1-7/8 Inches (47.6 mm)
governed pressure is reached. if desired tire
and install locknut.
pressure cannot be reached, check complete
system for leaks.
i. Check to see that the exhaust stem and
its spring are in place In the piston and Install
12-55. To prevent abrasive solids such as rust,
j. install retaining ring.
sand and pipe scale from entering the valve, all
regulators are fitted with a screen. Clean this
k. Check pressure and adjust as required.
screen regularly for best performance. It can be
removed by removing the valve guide plug at
the bottom of the regulator.
I. Tighten locknut and install top cover.
Screw down tightly to prevent entrance of
NOTE: When reassembling valve guide plug,
regulator must be in a vertical position.
12-56. AIR PRESSURE GAUGES.
m. If required, install new filters (can be
installed with head of a pencil). if filters are
12-57. if an air pressure gauge appears to be