Figure 6-1. Transmission hydraulic system schematic line.

TM 10-3930-621-34

(2) The hydraulic system consists of the torque

pressure for the converter and the disc and drum

converter, a pump driven by the converter, control valve

assembly. It is directly driven from the input side of the

assembly and a disc drum assembly.

converter. Since the converter is mounted on the engine

(3) The control valve assembly is mounted on the

flywheel, the pump is in operation whenever the engine is

transmission housing and forms the top closure of the

running. This means that there is a hydraulic pressure

gear case. Machined porting plates are attached to the

even with the engine idling.

bottom of the valve to eliminate external piping.

(5) With the converter pump operating, the oil is

Passages in the plates aline with passages drilled or cast

taken from the sump and pumped under a pressure of

into the transmission housing.

between 100 to 150 P.S.I., to the converter and to the

(4) The gear type oil pump provides hydraulic

pressure regulator of the control valve.

6-2