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| Illustration 1 | g00331943 |
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(1) Torque converter scavenge pump section
(2) Torque converter charging pump section (3) Parking brake release pump section (4) Cover for the torque converter scavenge screen | |
The pump has three sections:
- torque converter scavenge pump section (1)
- torque converter charging pump section (2)
- parking brake release pump section (3)
The pump is driven by a gear on the torque converter.
The torque converter scavenge section (1) is located on the drive end. This pump section takes oil from the bottom of the torque converter housing. The oil flows through a scavenge screen that is behind cover (4). The oil is then returned to the torque converter, hoist, and brake section of the hydraulic tank.
The other two pump sections get oil from the torque converter, hoist, and brake section of the hydraulic tank.
The torque converter charging section (2) sends the oil to the torque converter hydraulic filter, to the torque converter inlet relief valve, and to the torque converter.
The parking brake release section (3) sends oil to the parking brake release hydraulic filter. This oil flow is then divided. The parking and secondary brake valve receives some of the oil. This oil is used to release the spring applied parking brakes. The rest of the oil that was divided flows to the lockup clutch and to the traction control valve. This oil is used to engage the lockup clutch in the torque converter. The oil that is sent to the traction control valve is used as signal oil.