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| Illustration 1 | g00669906 |
Wheel Tilt System Hydraulic Schematic (1) Auxiliary pump (2) Strainer (3) Hydraulic tank (4) Steering system relief valve (5) Steering metering pump (6) Valve (7) Cylinder (8) Solenoid valve (9) Relief valve | |
The auxiliary pump (1) draws hydraulic oil from the tank (3) and through the strainer (2). The auxiliary pump sends pressurized oil to the steering metering pump (5). Some of the pressurized oil flows through the steering system relief valve (4) and out of the tank port on the steering metering pump (5). From the tank port, the oil flows to the relief valve (9). The relief valve (9) regulates the pressure of the oil which flows to the solenoid valve (8).
The solenoid valve (8) is normally open. When the solenoid valve (8) is open, oil flows through the solenoid valve (8), through the orifice in the valve (6) and into the cylinder (7). When the solenoid valve (8) is open, oil pressure in the cylinder (7) creates a downward force on the center wheel.
When the solenoid valve (8) is energized, pressurized oil flows into the rod end of the cylinder (7). Oil flows out of the head end of the cylinder (7), through the check ball in valve (6), through the solenoid valve (8) and into the hydraulic tank (3). When the solenoid valve (8) is energized the center wheel retracts.