Section 16: SUSPENSION
PA1562
40
UP:
The air coming from the control valve flows
through double shuttle valves, to supply air
springs. The double shuttle valves prevent
height control valves from releasing air from air
springs.
DOWN:
The control valve, on the dashboard, cuts off air
supply, so the double shuttle valves allow height
control valves to accomplish their function.
Height control valves release air from air springs
until suspension returns to its normal position.
10.2 MAINTENANCE
Refer to the air system schematic diagram “Opt.
Front Kneeling With Rear High-Buoy
Combination” annexed at the end of this
Section.
10.3 HIGH-BUOY – PRESSURE
REGULATING VALVE
The regulating valve is located in the front
service compartment. This valve should be
adjusted to 90 psi (621 kPa).
10.3.1 Adjustment
1. Before turning on system air pressure,
release jam nut (2, Fig. 53) then turn
regulator adjustment counterclockwise until
all load is removed from the regulating
spring.
2. Turn on system pressure.
3. Turn regulator adjustment clockwise until
the desired outlet pressure is reached.
4. To avoid minor readjustment after making a
change in pressure setting, always
approach the desired pressure from a lower
pressure. When reducing from a higher to a
lower setting, first reduce the pressure at a
lower pressure, and then increase it to the
desired level of pressure.
5. Tighten jam nut (2, Fig. 53) to lock pressure
setting.
10.3.2 Disassembly
1. Shut off inlet pressure and reduce pressure
in inlet and outlet lines to zero. Turn
regulator adjustment (1, Fig. 53)
counterclockwise until all load is removed
from regulating spring. Regulator can be
disassembled without removal from air line.
2. Disassemble regulator in accordance with
the item numbers on the exploded view.
10.3.3 Cleaning
1. Clean parts with warm water and soap. Dry
parts and blow out internal passages in
body using clean, dry compressed air.
2. Inspect parts. Replace those found to be
damaged.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
FIGURE 53: REGULATING VALVE
16035
10.3.4 Reassembly
1. Lubricate O-ring (14 and 16, Fig. 53), valve
stem (13, Fig. 53), tip of adjusting screw (1,
Fig. 53), and the outer circumference and
both sides of the thrust washer (9, Fig. 53)
with a light coat of good quality O-ring
grease.
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