Troubleshooting guide

8
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Section 2: The Charging, Air Treatment and Storage System
The charging, air treatment and storage system
consists of:
• An air compressor, to pressurize the system;
• A governor, to control when the compressor needs to
build, or stop building, air for the system and also to
control the air dryer purge cycle;
• An air dryer, to remove water and oil droplets from
the air;
• Reservoirs (or “air tanks”) to store air to be used for
vehicle braking, etc.;
The Charging, Air Treatment and Storage System
• Safety valves to protect against excessive pressure
in the system in the event that a charging system
component malfunction occurs (e.g. a line blockage);
• Single check valves to maintain a one-way fl ow of
air into the reservoirs. This arrangement protects the
contents from being drained in the event of an upstream
loss of pressure; and
• Low pressure indicators to alert the driver whenever
a reservoir has less than a pre-set amount of air
available.
Governor
Air Dryer
Primary
(Rear Axle)
Reservoir
Safety Valve
Air Compressor
Supply
Reservoir
To Front Axle To Rear Axle
Check
Valves
Safety
Valve
Low Pressure
Indicator
Purge
Valve
Drain Valve
Note: A three-
reservoir system
is shown here. See
below for a system
using an integrated
air dryer/reservoir.
Governor
Integrated Air Dryer Housing Also Includes:
Safety Valve; Check Valve; Purge Valve;
Delivery Check Valves
Primary
(Rear Axle)
Reservoir
Bendix
®
PuraGuard
®
QC
™
Filter
Air
Compressor
Secondary
(Front Axle)
Reservoir
Safety
Valve
Purge
Reservoir
To Front Axle To Rear Axle
To Vehicle Accessories
Sensitive to
Oil Carryover
To Vehicle
Accessories
Traditional Air Charging System
Integrated Air Dryer/Reservoir System