45Rfe Oil Pump Body And Gears - ATSG Chrysler 45RFE Service Manual

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Technical Service Information

45RFE OIL PUMP BODY AND GEARS

Shuttle Valve
A dual stage oil pump is also new for the 45RFE. The pump has three gears, one drive gear and two
driven gears as shown above. Both stages of the pump supply fluid during idle and at low engine
speeds. Under these conditions there is not enough pressure from the primary stage to close the
shuttle valve. As engine speed increases, so does the output from the primary stage. Once the
pressure from the primary stage builds up, the shuttle valve is forced closed and in this condition the
secondary stage has no effect and the primary side supplies all of the pressure needed for proper
transmission operation.
Copyright © 1999 ATSG
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AUTOMATIC TRANSMISSION SERVICE GROUP