Section 16: SUSPENSION
PA1562
34
4.3.5 Installation
1. Lightly spray the radius rod support with
water. Place the radius rod end over the
radius rod support (Fig. 45).
2. Position the retaining plate. Install the tab
washer and nuts (or bolts).
FIGURE 45: RADIUS ROD INSTALLATION 16028
CAUTION
Always use new tab washers at installation.
3. Tighten the nuts (or bolts) lightly, and repeat
at the other end.
4. Refer to heading "Suspension Height
Adjustment" later in this section, and set the
vehicle to normal ride height.
5. With the vehicle at normal ride height, apply
oil on threads and tighten all radius rod
anchor pin nuts or bolts to 110 – 130 lbf-ft
(150 – 175 Nm).
CAUTION
It is extremely important upon reconnection of
the rods that the proper clearance height
between the axle and body be maintained.
Otherwise, the rubber bushings in radius rod
ends will become preloaded, thus reducing
their life span.
5. SUSPENSION HEIGHT ADJUSTMENT
The flow of pressurized air from the accessory
air tank to the air springs is controlled by three
height control valves. The two rear valves are
mounted to the subframe and connected to the
rear axles through an arm and link connection.
The front valve is mounted to the subframe and
connected to the front air tank support. These
connections allow the valves to apportion air
pressure in the springs to the vehicle load,
maintaining normal ride height.
Immediate response height control valves
increase or decrease the air pressure in the
suspension system as required. One height
control valve is located at center of front sway
bar, and regulates air to front suspension air
springs in order to maintain the vehicle at the
required height. Two are located at the drive
axle, one on each inner side of rear
wheelhousing.
The appropriate vehicle body height is obtained
by measuring the clearance of all the air springs
installed on the vehicle. The two front air springs
clearance should be 11 ± ¼“ (279 ± 6 mm).
Refer to figure 46 to identify the correct area to
take measurement. The rear air springs
clearance should be 11 ½ ± ¼" (292 ± 6 mm).
FIGURE 46: TYPICAL AIR SPRING CLEARANCE 16058
At this point, it should not be necessary to make
an adjustment under normal service conditions.
However, if an adjustment is required, change
the position of the overtravel lever in relation to
the overtravel control body. The lever should be
moved up to raise vehicle height, and down to
lower it. Check that main air pressure is at
normal operating pressure and raise the vehicle
to the specified height.
CAUTION
Always adjust on "fill cycle". If it is necessary
to lower vehicle height, release sufficient air to
be well below height, and adjust to height or
fill cycle.
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