Secondary Air Tank; Accessory Air Tank; Expansion Air Tank - PREVOST H3-41 Maintenance Manual

SECTION 16 : SUSPENSION
FIGURE 45: REAR VALVE LOCATION ON X3 SERIES

12.1.3 Secondary Air Tank

This tank is located in front wheel housing. The
tank is installed vertically and is provided with a
bottom drain valve.
MAINTENANCE
It is recommended to purge the secondary air
tank by its bottom drain valve every 12,500
miles (20 000 km), or once a year, whichever
comes first.

12.1.4 Accessory Air Tank

On H3 vehicles, the accessory air tank is
installed at the ceiling
compartment. On X3 series, it is installed next to
the secondary air tank (the tank may be installed
vertically depending on type of front suspension).
The tank is provided with a bottom drain valve.
MAINTENANCE
It is recommended to purge the accessory air
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. Refer to Section 12, paragraph "5.
Accessory Air Filter" of the maintenance manual
for daily purge procedure.
54 PA1621 Maintenance Manual All Series | Section revised October 2018
of spare wheel
FIGURE 46: FRONT VALVE LOCATION ON H3 SERIES
12144
FIGURE 47: FRONT VALVE LOCATION ON X3 SERIES
12210

12.1.5 Expansion Air Tank

Two expansion tanks are located in front wheel
housing. These air tanks are located behind
secondary air tank. Also, six expansion tanks are
located near rear air springs (Figure 43).
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.
MAINTENANCE
It is recommended to purge the expansion air
tanks every 12,500 miles (20 000 km), or once
a year, whichever comes first.