Section 16: SUSPENSION
PA1593
23
Reverse removal procedure to replace height
control valve. After installation, check for
leakage using a soap and water solution.
6. AIR SYSTEM
The basic air system consists of an air
compressor, tanks, valves, filters and
interconnecting lines and hoses (refer to
Maintenance Manual, Section 12, "Brake and Air
System" for complete information). It provides a
means for braking, operating controls and
accessories, and suspension. An air system
schematic diagram is annexed at the end of this
section for better understanding of the system.
The air coming from the air dryer is first directed
to the wet air tank, then to the primary (for the
primary brake system), secondary (for the
secondary brake system), and accessory (for
the pneumatic accessories) air tanks (Fig. 27).
6.1 AIR TANK MAINTENANCE
Ensure that the accessories air tank is purged
during pre-starting inspection. A good practice is
to purge this tank at the end of every driving day
by the remote air tank drain valve located in the
front service compartment (Fig. 29).
Moreover, purge all tanks by their bottom drain
valves at specified intervals.
6.1.1 Wet Air Tank
This tank is installed above the drive axle on the
L.H. side, and is provided with a bottom drain
valve. It is recommended to purge the wet air
tank by its bottom drain valve every 12,500
miles (20 000 km), or once a year, whichever
comes first.
A remote valve located in engine compartment
and accessible through engine R.H. side door is
used to drain the air dryer (Fig. 28).
6.1.2 Primary Air Tank
The primary air tank is located above the drive
axle on the R.H. side.
This tank is provided with a bottom drain valve
(Fig. 53 and 54). It is recommended to purge the
primary air tank by its bottom drain valve every
12,500 miles (20 000 km) or once a year,
whichever comes first.
6.1.3 Secondary Air Tank
This tank is located in front wheelhousing,
between air springs. The tank is provided with a
bottom drain valve (Fig. 27).
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.
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