CP-563D, CS-563D, CS-573D and CS-583D Vibratory Compactors Propel System Caterpillar

Illustration 1	g00450644
Drive motor flushing valve (1) Orifice. (2) Relief valve. (3) Shuttle valve spool. (A) Closed loop circuit line. (B) Closed loop circuit line. (C) Flush port.

Illustration 2	g00450647
Drive motor flushing valve (2) Relief valve. (3) Shuttle valve spool.

The drive motor flushing valve is located in the closed loop circuit of the drum drive motor. Lines (A) and (B) represent the two loops of the closed loop circuit. The operation of the propel pump in either FORWARD or REVERSE regulates the direction of flow in the loop. The direction of flow in the loop determines whether a line is high pressure or low pressure.

Pilot pressure on the high pressure side shifts shuttle valve (3). The low pressure side opens to relief valve (2). The relief valve is set at 1800 kPa (261 psi). The return oil on the low pressure side of the closed loop flows across the relief valve. After passing through the relief valve, the oil flows through port (C) to the motor case. This oil cools the motor and the oil flushes the motor. The amount of flushing oil is controlled by the size of the orifice (1). The orifice provides 10 L/min (2.6 US gpm) of flushing flow.