Jeep Cherokee

 Service Manual

Transmission and transfer case » AW-4 automatic transmission » Description and operation
Hydraulic system

DESCRIPTION

The hydraulic system consists of the pump, valve body and solenoids, and four hydraulic accumulators.

The oil pump provides lubrication and operating pressure.

The valve body controls application of the clutches, brakes, second coast band, and the converter clutch.

The valve body solenoids control sequencing of the 1-2, 2-3 and 3-4 shift valves. The solenoids are activated by signals from the transmission control module.

The accumulators are used in the clutch and brake feed circuits to control initial apply pressure. Spring loaded accumulator pistons modulate the initial surge of apply pressure for smooth engagement.

AW-4 automatic transmission

Fluid

Torque converter

Oil pump

Transmission valve body components

Pistons

Transmission ranges and shift lever positions

Transmission control module (TCM)

Hydraulic system

Transmission cooler

Brake transmission shift interlock mechanism