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Jeep Cherokee
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Transmission and transfer case » Automatic transmission-30RH » Description and operation
Front clutch

DESCRIPTION

The front clutch assembly (Fig. 43) is composed of the front clutch retainer, pressure plate, four clutch plates, four driving discs, piston, piston return spring, return spring retainer, and snap rings. The front clutch is the forwardmost component in the transmission geartrain and is directly behind the oil pump and is considered a driving component.

NOTE: The number of discs and plates may vary with each engine and vehicle combination.

OPERATION

To apply the clutch, pressure is applied between the clutch retainer and piston. The fluid pressure is provided by the oil pump, transferred through the control valves and passageways, and enters the clutch through the hub of the reaction shaft support.

With pressure applied between the clutch retainer and piston, the piston moves away from the clutch retainer and compresses the clutch pack. This action applies the clutch pack, allowing torque to flow through the input shaft into the driving discs, and into the clutch plates and pressure plate that are lugged to the clutch retainer. The waved snap ring is used to cushion the application of the clutch pack. In some transmissions, the snap ring is selective and used to adjust clutch pack clearance.

When pressure is released from the piston, the spring returns the piston to its fully released position and disengages the clutch. The release spring also helps to cushion the application of the clutch assembly.

When the clutch is in the process of being released by the release spring, fluid flows through a vent and one-way ball-check-valve located in the clutch retainer. The check-valve is needed to eliminate the possibility of plate drag caused by centrifugal force acting on the residual fluid trapped in the clutch piston retainer.

Fig. 43 Front Clutch
Fig. 43 Front Clutch

1 - RETAINER HUB SEAL
2 - CLUTCH PISTON
3 - PISTON SPRING
4 - SPRING RETAINER SNAP RING
5 - CLUTCH DISCS
6 - PRESSURE PLATE
7 - SNAP RING (WAVED)
8 - CLUTCH PLATES
9 - SPRING RETAINER
10 - PISTON SEAL
11 - FRONT CLUTCH RETAINER

    More about «Description and operation»:

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    Oil pump

    Valve body

    Accumulator

    Pistons

    Front clutch

    Rear clutch

    Overrunning clutch

    Planetary gearset

    Bands

    Servos

    Governor

    Gearshift mechanism

    Converter drainback valve

    Brake transmission shift interlock mechanism

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