Case IH AFX8010 Repair Manual page 1567

2. Valve Spool
3. Spring
4. End Plug
5. Pressure to Disengage Port Fitting
6. Pressure to Engage Port Fitting
7. Drain Supply Port
8. Return to Tank Port
9.
Motor Case Drain Port
The drain valve is operated by hydraulic fluid under charge pressure. A spool inside the valve will shift left or right,
depending upon what side of the spool charge pressure is applied to. When the Powered Rear Axle is "OFF",
hydraulic fluid from the pressure to disengage side of the valve is directed to the right side of the spool, which moves
the spool to the left. This opens a path for the hydraulic fluid draining from the wheel motors to the hydraulic fluid
reservoir (tank) Hydraulic fluid will flow through an external line, from the "tee' at the reverse pressure supply/return
port to a port on the front of the drain valve. Hydraulic fluid will then flow past the drain valve spool land, and out to
the valve case drain connection through an external tube. The fluid then is returned to tank. When the Powered
Rear Axle is "ON", hydraulic fluid from the pressure to engage side of the valve is directed to the left side of the drain
valve spool, which moves the spool to the right. This closes the path for hydraulic fluid to return to tank.
1. Solenoid Valve Location
2. Spacer
3. Forward Check Ball
4. Reverse Check Ball
5.
Oil Passage
LOW PRESSURE SHUTTLE VALVE
The low pressure shuttle valve provides hydraulic fluid under charge (pilot) pressure to the solenoid valve to engage
or disengage the Powered Rear Axle system. The solenoid valve, in turn, supplies hydraulic fluid under charge
pressure to either end of the selector spool to move the spool. Depending upon what direction the spool moves,
hydraulic fluid to the wheel motors will be switched "ON" or "OFF". This fluid also controls the spool in the drain
TRAVELLING - 2WD-4WD SYSTEM Hydraulic
DS00M058
Low Pressure Shuttle Valve
9688 1 27/05/2004
D.14.C / 7
3