SM 1941 4-00
1
Section 250-0170
BRAKING SYSTEM - Air Tanks and Mounting
SM - 819
Fig. 1 - Air Tanks and Mounting
DESCRIPTION AND OPERATION
There are three air tanks in the air system; primary
tank, front brake tank and rear brake tank. The primary
and front air tanks are located at the front left hand
side of the tractor frame, with the primary tank to the
outside. The rear brake tank is located on the left hand
side of the trailer frame, forward of the frame cross
channel.
Air tanks store compressed air from the engine
compressor until it is required for brake or accessory
operation. Brake tanks maintain an air supply for
normal brake application or for automatic safety brake
application, if pressure drops in the primary tank.
Air pressure in the tanks is indicated on the air system
pressure gauge located on the instrument panel in the
operators compartment.
There are 7 ports on the primary tank, 3 ports on the
front brake tank and 4 ports on the rear brake tank, as
follows:
Primary Tank:
Port 'A' - Pressure Switch
Port 'B' and 'C' - Plugged
Port 'D' - Supply to diff lock solenoid valve and
regulating valve
Port 'E' - Supply to pressure protection valve port '24'
Port 'F' - Supply to suspension levelling valve and
coolant sensor valve
Drain Port
Front Brake Tank:
Port 'A' - Supply to pressure protection valve port '21'
and air pressure sender (gauge)
Port 'B' - Supply to treadle valve
Drain Port
Rear Brake Tank:
Port 'A' - Supply to pressure protection valve port '22'
Port 'B' - Supply to relay emergency valve
Port 'C' - Plugged
Drain Port
4 - Guard
5 - 'U' Bolt
6 - Nut
7 - Lockwasher
8 - Drain Cock
9 - Bolt
1 - Primary Tank
2 - Front Brake Tank
3 - Rear Brake Tank
10 - Lockwasher
11 - Nut
12 - Bolt
13 - Lockwasher
Courtesy of Machine.Market
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