784C, 785C and 785C HAA Off-Highway Truck/Tractors Power Train Caterpillar


Torque Converter Hydraulic System

Usage:

785C 1HW



Illustration 1g00498610



Illustration 2g00489688

Schematic for torque converter system

(2) Parking brake release pump section

(3) Parking brake release hydraulic filter

(4) Torque converter charging pump section

(5) Torque converter hydraulic filter

(7) Passage to the parking and secondary brake valve

(8) Passage from the lockup clutch solenoid

(9) Torque converter scavenge pump section

(10) Passage to the transmission lubrication system

(11) Torque converter, hoist, and brake section of the hydraulic tank

(12) Screen

(13) Scavenge screen

(14) Torque converter

(15) Pressure reduction valve in the lockup clutch and synchronizing valve

(16) Relay valve in the lockup clutch and synchronizing valve

(17) Passage to the torque converter and front brake cooling diverter valve

(18) Torque converter inlet relief valve

(19) Lockup clutch for the torque converter

(20) Torque converter housing

(21) Torque converter outlet relief valve

(22) Torque converter and front brake cooling screen

(23) Bypass switch

(24) Shuttle valve in the lockup clutch and synchronizing valve

(25) Modulation reduction valve in the lockup clutch and synchronizing valve

(26) Load piston in the lockup clutch and synchronizing valve

(27) Selector piston in the lockup clutch and synchronizing valve

(28) Pump drive

(29) Torque converter lockup clutch and synchronizing valve

(AA) Pressure tap for torque converter inlet pressure

(BB) Pressure tap for torque converter outlet pressure

(CC) Pressure tap for pilot oil of the lockup clutch and synchronizing valve "RV"

(DD) Pressure tap for maximum pressure of the lockup clutch "LU"

(EE) Pressure tap for pump pressure of the parking brake release pump "PMP"

Location Of Components




Illustration 3g00358252

Top view of oil lines for the torque converter

(2) Parking brake release pump section

(4) Torque converter charging pump section

(5) Torque converter hydraulic filter

(9) Torque converter scavenge pump section

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

(18) Torque converter inlet relief valve

(20) Torque converter housing

(21) Torque converter outlet relief valve

(29) Torque converter lockup clutch and synchronizing valve

(30) Lockup solenoid




Illustration 4g00358253

Side view of oil lines for the torque converter

(2) Parking brake release pump section

(4) Torque converter charging pump section

(9) Torque converter scavenge pump section

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

(18) Torque converter inlet relief valve

(20) Torque converter housing

(21) Torque converter outlet relief valve

(29) Torque converter lockup clutch and synchronizing valve

(30) Lockup solenoid




Illustration 5g00361632

Rear of the torque converter housing

(16) Relay valve in the lockup clutch and synchronizing valve

(18) Torque converter inlet relief valve

(20) Torque converter housing

(21) Torque converter outlet relief valve

(29) Torque converter lockup clutch and synchronizing valve

(AA) Pressure tap for torque converter outlet pressure

(BB) Pressure tap for torque converter inlet pressure

(CC) Pressure tap for pilot pressure of lockup clutch "RV"

(DD) Pressure tap for maximum pressure of lockup clutch "LU"

(EE) Pressure tap for pump pressure of the parking brake release pump "PMP"

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