Wet Air Tank; Primary Air Tank; Accessory Air Tank; Secondary Air Tank - PREVOST H3-41 Maintenance Manual

SECTION 12: BRAKE AND AIR SYSTEM
4.2.1

Wet Air Tank

This reservoir located in front and above the L.H.
wheel of the drive axle in the rear wheel housing,
is provided with a bottom drain valve.
4.2.2

Primary Air Tank

This reservoir is located above the tag axle, and
is provided with a bottom drain valve.
4.2.3

Accessory Air Tank

The accessory air tank is installed at the ceiling
of spare wheel compartment and is provided
with a bottom drain valve.
FIGURE 4: FRONT SERVICE COMPARTMENT
4.2.4

Secondary Air Tank

Located in the front left wheel housing for the
independent suspension equipped vehicles, this
tank is set behind the front axle and the
accessory air tank for the beam axle equipped
vehicles. Tank is provided with a bottom drain
valve.
4.2.5

Kneeling Air Tank

The kneeling air tank is installed on vehicles
equipped with the Kneeling or Hi/Low-Buoy
options. It is located behind the front suspension
arms for independent front suspension vehicles
and in front of the front axle on vehicles
equipped with a beam suspension, tank is
provided with a bottom drain valve.
10 PA1621 Maintenance Manual All Series | Revised June 2020
4.2.6

I-Shift Transmission Air Tank

Installed on vehicles equipped with this option,
these reservoirs are located in the rear tag axle
wheel housing on X Series vehicles, a single
tank located between the tag wheels is provides
on H Series vehicles. All are provided with a
bottom drain valve.
4.2.7 Optional Parking Brakes Overrule Air
Tank
On vehicle equipped with this option, the parking
brakes overrule air tank is installed at the ceiling
of the rear baggage compartment, on the L.H.
side.
4.3

PING TANK

The ping tank is located next to the power
steering pump reservoir in the engine compart-
ment; it is accessible through the engine
compartment R.H. side door. This tank is used
to dissipate heat and to reduce noise produced
by the air compressor cycling on and off.

5. AIR SYSTEM EMERGENCY FILL VALVES

All vehicles come equipped with two emergency
fill valves that enable system pressurization by
an external source such as an air compressor.
The rear valve is located in the engine
compartment and is accessible from engine
compartment R.H. side door (Figure 7).
CAUTION
Maximum allowable air pressure is 140 psi
(965 kPa). Air filled through these two points
will pass through the standard air filtering
system provided by Prevost. Do not fill system
by any other point on the system.
The front valve is located in the front electrical
and service compartment close to R.H. side of
doorframe (Figure 4).
These two air system emergency fill valves are
fitted with the same valve stems as standard
tires, and can be filled by any standard external
air supply line.