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Friday, January 25, 2013

789D and 789D XQ Off-Highway Truck Air System and Brakes: Air System


(1) Autolube reservoir
(2) Air tank check valves
(3) Primary air tank
(4) Drain valves
(5) Air relief valve for primary air tank
(6) Starter relay valve
(7) Air starting motor
(8) Air compressor with air compressor governor
(9) External air supply
(10) Air dryer with air relief valve
(11) Starter solenoid valve
(12) Torque converter and front brake cooling diverter valve
(13) Brake air relay valve
(14) Cooling diverter solenoid
(15) Brake air pressure sensor
(16) Air suspension buddy seat that is an attachment
(17) Cleanout hose that is an attachment
(18) Air suspension seat
(19) Air horn solenoid
(20) Solenoid valve for autolube
(21) Air system pressure protection valve
(22) Service brake and retarder pressure switch
(23) Secondary brake and parking brake pressure switch
(24) Parking and secondary brake valve
(25) Brake master cylinder (front)
(26) Brake master cylinders (rear)
(27) Air horn
(28) Manual retarder pressure switch
(29) Double check valve
(30) Retarder air control valve
(31) Service brake air control valve
(32) Secondary brake air control valve
(33) Parking brake (air control valve)
(34) Parking brake valve (reset)
(35) Secondary brake inverter valve
(36) Secondary air tank(37) Cab wall
Brake air pressure sensor (15) monitors brake air pressure. The operator will be alerted to a condition of low air pressure.
Air pressure switch (22) for the service brake and the retarder is normally closed. This pressure switch is opened by air pressure when the service brakes or the retarder are applied. When air pressure switch (22) for the service brake and the retarder is open, the pressure switch signals the Power Train ECM in order to allow the transmission to perform rapid shifts. The Power Train ECM also indicates that higher engine rpm is needed for upshifts or for downshifts of the transmission when this pressure switch is open.
Secondary brake and parking brake pressure switch (23) is normally open. The pressure switch is closed by air pressure when the parking brakes or secondary brakes are released. When secondary brake and parking brake pressure switch (23) is open, this pressure switch signals the Power Train Electronic Control Module (Power Train ECM) to allow rapid shifts.
Manual retarder pressure switch (28) is normally open. This pressure switch is closed when retarder air control valve (30) is applied. Manual retarder pressure switch (28) operates the indicator in the cab.

Location Of Components

(29) Double check valve
(30) Retarder air control valve
(31) Service brake air control valve
(32) Secondary brake air control valve(33) Parking brake (air control valve)
Compartment in the rear of the cab(35) Secondary brake inverter valve
Compartment in the rear of the cab
(14) Cooling diverter solenoid
(15) Brake air pressure sensor
(21) Air system pressure protection valve
(22) Service brake and retarder pressure switch(23) Secondary brake and parking brake pressure switch
View of the front
(1) Autolube reservoir(8) Air compressor with air compressor governor



Typical view of the LH side
(3) Primary air tank(5) Air relief valve for primary air tank
Front view of air lines for the chassis
(12) Torque converter and front brake cooling diverter valve
(13) Brake air relay valve
(24) Parking and secondary brake valve
(25) Brake master cylinder (front)(26) Brake master cylinders (rear)




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789D and 789D XQ Off-Highway Truck Air System and Brakes: Air System Rating: 4.5 Diposkan Oleh: Unknown

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