Section 16: SUSPENSION
PA1562
38
FIGURE 51: REAR VALVE LOCATION 12211
7.1.4 Accessory Air Tank
The accessory air tank is installed next to the
secondary air tank. The tank may be installed
vertically depending on type of front suspension
and is provided with a bottom drain valve (Fig.
38).
It is recommended to purge the tank by its
bottom drain valve, every 12,500 miles (20 000
km) or once a year, whichever comes first.
A remote drain valve is located in front service
compartment (Fig. 52) underneath the
accessory air filter. Refer to Section 12,
paragraph "4. Accessory Air Filter" of the
maintenance manual for daily purge procedure.
FIGURE 52: FRONT VALVE LOCATION 12210
7.1.5 Expansion Air Tank
Two expansion tanks will be installed in front
wheelhousing if the IFS was chosen as an
option. These air tanks are located behind
secondary and accessory air tank. Also, six
expansion tanks are located near rear air
springs (Fig. 49 and 50). Expansion tanks are
connected in series with air springs. Expansion
tanks are used to lower the stiffness of the air
spring. They are provided with a bottom drain
valve.
It is recommended to purge them, with all other
tanks, every 12,500 miles (20 000 km) or once a
year, whichever comes first.
7.2 EMERGENCY FILL VALVES
The vehicle is equipped with two air system
emergency fill valves to supplement the air
system when air pressure is low and engine
cannot be operated.
The rear valve is located in engine
compartment and accessible from engine R.H.
side door (Fig. 51).
CAUTION
No other point should be used to supply air
system. The maximum allowable air pressure
is 125 psi (860 kPa).
The front valve is located in the front service
compartment close to accessory air filter
(Fig. 52).
These two air valves are fitted with the same
valve stems as standard tires, and can be filled
by any standard external air supply line.
The rear valve will supply air for all systems
(brakes, suspension and accessories) while the
front valve will supply air for accessories only.
CAUTION
Air filled through these two points will pass
through the standard air filtering system
provided by Prévost. Do not fill air through any
other points.
8. HUB UNIT AND SWIVEL ASSEMBLY
Refer to “DANA SPICER Service Manual
General Information, Maintenance Manual
Model NDS and Maintenance Manual NDS
Axles” annexed to Section 10 of the maintenance
manual.
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