789B Off-Highway Truck Air System and Brakes Caterpillar


Hydraulic System Schematic

Usage:

789B 7EK



Illustration 1g00456575

(1) Left rear wheel brake

(2) Air breathers

(3) Left front wheel brake

(4) Torque converter lockup clutch and synchronizing valve

(5) Makeup tank for brake oil

(6) Torque converter and front brake cooling oil cooler

(7) Torque converter

(8) Torque converter outlet relief valve

(9) Pump drive

(10) Rear brake cooling pump section

(11) Parking brake release pump section

(12) Torque converter charging pump section

(13) Torque converter scavenge pump section

(14) Transmission hydraulic control

(15) Torque converter inlet relief valve

(16) Transmission cooler inlet relief valve

(17) Transmission oil cooler

(18) Parking and secondary brake valve

(19) Torque converter and front brake cooling diverter valve

(20) Brake master cylinder (front)

(21) Brake master cylinders (rear)

(22) Transmission planetary

(23) Electric drive pump check valve

(24) Parking and secondary brake release electric drive pump

(25) Transmission charging section of the gear pump

(26) Transmission lubrication section of the gear pump

(27) Transmission scavenge section of the gear pump

(28) Rear slack adjuster

(29) Traction control valve

(30) Rear brake oil cooler relief valve

(31) Hoist control valve

(32) Rear brake cooling section of the gear pump

(33) Hoist section of the gear pump

(34) Front slack adjuster

(35) Right rear wheel brake

(36) Rear brake oil coolers

(37) Hoist counterbalance valve

(38) Hoist cylinders

(39) Hoist diverter valve

(40) Torque converter, hoist, brake, and transmission hydraulic tank

(41) Right front wheel brake

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