Installation; Shock Absorbers; Shock Absorber Removal - PREVOST H3-41 Maintenance Manual

5. Disconnect the height control valve link and
pull down the control arm to ensure all air is
exhausted from air springs.
6. Lower the IFS slightly while maintaining the
vehicle body at the same level.
NOTE
While performing this step, do not change the
height control valve control arm adjustment.
7. Disconnect air line from air spring, remove
elbow (if applicable), and cover both the line
end and fitting to prevent the entry of foreign
matter.
8. Unscrew the two air spring lower nuts (2
nuts). Rotate the air spring to disengage the
upper mounting and remove the air spring.

4.15.3 Installation

NOTE
To facilitate air spring installation, compress it
manually then put a piece of tape over the air
line threaded fitting. This prevents air from
getting back into the bag and keeps it
compressed, thus enabling to place the bag in
between the mounting plates and greatly
easing installation.
1. Compress air spring as necessary, then
aligning studs with their holes, position air
spring between both the lower and upper
supports. Thread the lower nuts a few turns.
2. Tighten and torque the lower stud nuts as
prescribed in Torque Table 2.
3. Install elbow (if applicable), then connect air
line.
4. Connect the height control valve link.
5. Build up air pressure in system.
NOTE
To accelerate this operation, air reservoirs can
be filled from an exterior air supply connected
to the accessory tank fill valve or to the
emergency fill valve.
6. Check operation of air springs and with the
primary air system at normal operating
pressure(122 - 140 psi (841 - 965 kPa)),
coat the air line connections and air spring
mounting areas with a water and soap
solution. Bubbles will indicate an air leak,
4.16
The two front shock absorbers are double-acting
and telescopic type. Shock absorbers ensure a
smooth ride and enhance vehicle stability on the
road. Front shock absorbers have eye-type
mountings on the upper side and bayonet type
on lower side. Shock absorbers are non-
adjustable and non-repairable.
When a shock absorber is found defective,
always replace with a new set on affected
axle, except if there has been a recent
replacement of one unit. The following method
will help in determining if both shock absorbers
on the same axle have to be replaced. (Refer
to the SACHS document "Guideline To
Evaluate Warranty Claims" annexed at the end
of this section before replacing a shock).

4.16.1 Shock Absorber Removal

1. Remove the nut, washer and rubber joint
PA1621 Maintenance Manual All Series | Section revised October 2018
SECTION 16 : SUSPENSION
and none is permissible. Repair or replace
defective parts.

SHOCK ABSORBERS

CAUTION
from shock absorber mounting stud. Discard
the rubber joints.
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