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| Illustration 1 | g01062854 |
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Diagram for oil flow (1) Right valve group (2) Steering accumulator (if equipped) (3) Implement supply line (4) Steering metering pump (5) Steering metering pump drain line (6) Lines to steering cylinders (7) Combination valve (8) Pump control valve (9) Hydraulic and steering pump (10) Signal line for the implements (11) Steering metering pump supply line (12) Drain line for the implements (13) Left valve group | |
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| Illustration 2 | g01060364 |
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(3) Implement supply lines
(7) Combination valve (10) Signal lines for the implements (12) Drain lines for the implements (14) Hydraulic pump suction line from hydraulic tank | |
In a low pressure standby situation, the implement circuit and the steering circuit do not demand any oil from hydraulic and steering pump (9). Hydraulic and steering pump (9) sends low pressure oil to combination valve (7). The low pressure oil flows through implement supply line (3) to right valve group (1) and to left valve group (13). Since the valve groups do not require any flow, the pump destrokes and the flow is reduced to a minimum.
Hydraulic oil also flows to steering metering pump (4) through supply line (11). Since pump (4) does not demand any oil flow, the oil flows through an internal orifice in pump (4). The oil then flows back to the hydraulic tank through line (5). The steering signal acts upon pump control valve (8) in order to keep pump (9) at a low pressure standby situation.