MPT Models: Construction

The transfer clutch drum and rear drive shaft are joined to each other by welding. The rear drive shaft has drilled oil passages for transfer clutch control and also for lubrication of extension bushing and ball bearing in it.

Fig 1: Exploded View Of Transfer Clutch

Courtesy of SUBARU OF AMERICA, INC.

The transfer hydraulic pressure control unit is bolted at the rear end of transmission case through the transfer valve plate.

The hydraulic pressures used for the transfer hydraulic pressure control unit (line pressure and pilot pressure) are supplied from the transmission's hydraulic control valve assembly through the passages formed in the transmission case.

The transfer duty solenoid adjusts the pilot pressure of the transfer clutch valve depending on the signals from the TCM. The transfer clutch valve in turn modulates the line pressure into the transfer clutch pressure before it is applied to the clutch piston.

The transfer clutch pressure adjusted in this way engages the clutch to different degrees according to driving conditions so that the optimum torque is distributed to the rear wheels.

Fig 2: Identifying Transfer Hydraulic Pressure Control Unit Parts

Courtesy of SUBARU OF AMERICA, INC.