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| Illustration 1 | g02731723 |
The location of the solenoid valve and manifold is on the inside right frame rail. The solenoid valve and manifold will ensure that priority goes to the steering system first.
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| Illustration 2 | g03454678 |
Schematic for solenoid valve and manifold with the accumulators charging (1) Solenoid valve (2) Outlet to the pump and motor for the final drive lubrication (3) Outlet to the piston motor for the blower fan (4) Control valve (5) Inlet from the steering piston pump (6) Check valve (7) Outlet to the pressure sensor (8) Drain to tank (9) Outlet to the solenoid and relief valve (10) Relief valve (11) Plug | |
Supply oil from the steering piston pump enters the solenoid valve and manifold through hose (5) . The oil then flows to the following three components:
- Pressure sensor
- Control valve (4)
- Solenoid and relief valve
Oil that enters the solenoid valve and manifold through hose (5) flows through the pressure sensor. The oil also flows toward control valve (4) , but control valve (4) blocks the flow of oil. Finally, oil will flow over the orifice to the outlet to the solenoid and relief valve (9) . The solenoid and relief valve controls the charging of the accumulators.
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| Illustration 3 | g03454680 |
Schematic for solenoid valve and manifold with the accumulators charged and the rear axle solenoid energized (1) Solenoid valve (2) Outlet to the pump and motor for the final drive lubrication (3) Outlet to the piston motor for the blower fan (4) Control valve (5) Inlet from the steering piston pump (6) Check valve (7) Outlet to the pressure sensor (8) Drain to tank (9) Outlet to the solenoid and relief valve (10) Relief valve (11) Plug | |
When the accumulators are charged and all demands are met, the pressure at control valve (4) will be equal on both sides. With the combination of the spring and the pilot oil, control valve (4) remains in the blocked position. When the pressure at relief valve (10) reaches the adjusted pressure, the oil will be allowed to flow through relief valve (10) to the steering hydraulic tank. At this time, the pilot pressure on the left side of the spring and the left side of control valve (4) will be less than the pilot pressure on the right side. The pilot pressure on the left side will shift control valve (4) to the right envelope. Supply oil will then flow over check valve (6) to the blower motor.
Systems that are connected to the solenoid valve and manifold include the piston motor for the blower fan and the pump and motor for the final drive lubrication.
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| Illustration 4 | g03454697 |
Schematic for solenoid valve and manifold with the accumulators charged and the rear axle solenoid de-energized (1) Solenoid valve (2) Outlet to the pump and motor for the final drive lubrication (3) Outlet to the piston motor for the blower fan (4) Control valve (5) Inlet from the steering piston pump (6) Check valve (7) Outlet to the pressure sensor (8) Drain to tank (9) Outlet to the solenoid and relief valve (10) Relief valve (11) Plug | |
Normally, if the final drive oil is warmed to the right temperature, the valve will be de-energized. If solenoid valve (1) is de-energized, oil will flow through the orifice and out port (2) to the motor for the final drive lubrication. When the engine is started, and the temperature is below the target temp, solenoid valve (1) will be energized. When solenoid valve (1) is energized, the flow of oil to the final drive motor will be blocked.
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| Illustration 5 | g03454765 |
Piston pump (steering) (12) Pump control valve | |
Steering pump control valve (12) is fastened to the steering piston pump. Steering pump control valve (12) controls the maximum pump pressure of the steering piston pump. Relief valve (10) is used as the relief valve for the steering system. Excess oil will flow through relief valve (10) and to the steering section of the hydraulic tank.
In order to initiate the flow of oil to the blower motor, the solenoid valve and manifold is controlled hydraulically through relief valves.