Motor Flush Valve
Motor Flush Valve.
(A) Closed loop circuit port. (B) Closed loop circuit port.
(C) Flush port.
Drum Propel Motor.
(1) Relief valve. (2) Crossover shuttle check valve.
The motor flush valve is located in the drum motor of the
propel closed loop circuit. Lines (A) -(A) and (B) -(B) represent
both sides of the closed loop circuit. The direction of tilt of the
pump swashplate, either FORWARD or REVERSE operation,
determines direction of flow in the loop. Direction of flow in the
loop determines whether a line is high pressure or low
Pilot pressure on the high pressure side shifts spring centered
crossover shuffle check valve (2). The low pressure side
opens to relief valve (1). The relief valve in the flushing valve
is set at 1724 kPa (200 psi). Because the relief valve is set at
a lower pressure, charge pressure oil crosses the relief valve.
Oil flows through flush port (C) to the motor case. This oil
cools and flushes the motor and pump.