PA1621 Maintenance Manual All Series | January 2017
b) Extreme bushing wear;
c) Shifted bushing or sleeve;
d) Deep cracks in bushing material (shallow
surface cracks are normal);
e) Loose shock absorber pins;
f) Presence of convex washers, and their
position relative to the rubber bushing.
5.2.2 Removal
1. Remove nuts and washers from shock
absorbers on upper mounting pin and lower
mounting bracket, taking care to identify the
inner and outer washers to ease
reinstallation. Refer to Figure 37 for details.
2. Remove the shock absorber assembly from
pins.
4. Remove the two rubber joints from the
shock absorber and discard them.
FIGURE 41: TYPICAL SHOCK ABSORBER SETUP 16009
5.2.3 Installation
1. Ensure that the shock absorber mounting
pin is tight and that the threads are not
stripped.
2. Install new upper rubber mounting bushings
on shock absorber.
3. On the lower mounting, take care to install
the rubber joints with the wide end of the
tapered hole as shown in Figure 42.
FIGURE 42: LOWER SHOCK MOUNTING BUSHINGS
4. At the upper mounting pin, place the inner
washer with washer convex side facing the
shock absorber rubber bushing.
5. Install the shock absorber eyes over the
mounting pin, then the outer washers (with
washer convex side facing the shock
absorber rubber joints.
If shock absorber pins are removed, they must
be reinstalled using “Loctite
Specifications” in this section).
5. Place the lower and upper mounting pin stud
nuts and torque as prescribed in Torque
Table 3.
5.3 RADIUS RODS
Radius rods are used to secure the axles in the
proper transversal and longitudinal positions.
Four radius rods are provided on the drive axle
suspension (three longitudinal and one
transversal) and four on the tag axle. These rods
transmit both braking and driving forces from the
axles to the vehicle body.
Refer to section 2.3 for more information
regarding radius rods.
6 SUSPENSION AIR SYSTEM
The suspension air system has its own air
reservoir (accessory tank) which is located in the
reclining bumper compartment. Pressurized air
from the main tank (wet tank) flows through a
pressure protection valve (PR-4), to the
accessory air tank and through an air filter which
is located in front service compartment.
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