Case IH AFX8010 Repair Manual page 1574

The hydraulic fluid on the pressure to disengage (right) side of the selector spool (2), Figure 4, will flow through the
drilled passage (14), Figure 4, to port (C) of the solenoid valve (1), Figure 3. The hydraulic fluid will flow through the
valve and exit at port (D) and out of the valve through the case drain. The hydraulic fluid then returns to tank.
When hydraulic fluid under charge pressure flows into the pressure to engage port on the valve, a "tee" fitting at the
port allows hydraulic fluid to flow to the drain valve as well. The charge pressure shifts the spool in the drain valve
so hydraulic fluid from the wheel motors is no longer allowed to drain back to tank through the drain valve.
VALVE OPERATION "ON" POSITION
(Reference Figures 6, 7, and 8)
NOTE: References to directions are as if viewing the valve from the rear, facing the front of the combine.
A. Oil Supply from Low Pressure Spool
•
B. From Right Hand Side of Selector Spool Via External Line
C. From Right Side of Selector Spool
D. To Case Drain
When the powered rear axle is switched "On", the system will momentarily go into an "Intermediate" position to fill
the wheel motors with hydraulic fluid. When the system is full, the selector spool will move completely to the right
in the valve, to the "On" position, allowing the wheel motors to be driven.
When the Powered Rear Axle switch in the combine cab is turned to the "On" position, current is supplied to the
solenoid valve (1), Figure 6. This energizes the coil and causes the spring-loaded spool to move towards the coil.
Hydraulic fluid under charge pressure will flow through the solenoid valve from port (A) to port (B) and to the
pressure to engage (left) side (5) of the selector spool (2), Figure 7, in the valve through an external tube. The
hydraulic fluid shifts the selector spool to the right and once the system is full of hydraulic fluid, the spool will
shift fully to the right against the spring (3).
FORWARD
NOTE: The selector spool controls whether or not hydraulic fluid flows to the wheel motors, but does not control
forward or reverse movement in the wheel motors.
TRAVELLING - 2WD-4WD SYSTEM Hydraulic
DS00M060C
Solenoid Valve
9688 1 27/05/2004
D.14.C / 14
6