Case IH AFX8010 Repair Manual page 1577

TRAVELLING - 2WD-4WD SYSTEM Hydraulic
differential by shifting in the valve. For more information on flow divider description of operation, refer to: Control
valve - Static description (D.14.C.14 - C.30.A.20).
10
DS00M064pd-16
Cross Section of Control Valve (Reverse Valves Upper Tier) - On- "Reverse" Position
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Return hydraulic fluid from the wheel motors will flow into the forward pressure supply/return ports (18, 19), Figure
10. The fluid is then directed to the flow dividers (17) and forward check valves (8), Figure 10. The check valves will
open when hydraulic flow exceeds the amount of fluid allowed to flow through the 10.3 mm (0.406 in) orifice in each
flow divider. The hydraulic fluid will flow through the center passage (6), Figure 10, past the selector spool and (21),
Figure 9, and out of the forward high pressure port ("F"), Figure 9. The hydraulic fluid on the pressure to disengage
(right) side of the selector spool (2), Figure 9, will flow through the drilled passage (14), Figure 9, to port (C) of the
solenoid valve (1), Figure 6. The hydraulic fluid will flow through the valve and exit at port (D), Figure 6, 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 (5), Figure 9, on the valve, a "tee" fitting at the port allows hydraulic
fluid to flow to the drain valve. 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.
9688 1 27/05/2004
D.14.C / 17