Fluid Pump: Description and Operation

42LE - Automatic Transmission
OIL PUMP - DESCRIPTION







The oil pump is located in the pump housing inside the bell housing of the transaxle case. The oil pump assembly (Fig. 326) consists of an inner and outer gear, a housing, and a cover that also serves as the reaction shaft support.


OPERATION
As the torque converter rotates, the converter hub rotates the inner and outer gears. As the gears rotate, the clearance between the gear teeth increases in the crescent area, and creates a suction at the inlet side of the pump.

This suction draws fluid through the pump inlet from the oil pan. As the clearance between the gear teeth in the crescent area decreases, it forces pressurized fluid into the pump outlet and to the valve body.