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NEWHOLLAND T7030.40.50.60 Repair Mannual

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DISTRIBUTION SYSTEMS ­ PRIMARY HYDRAULIC POWER SYSTEM Electro­hydraulic remote valve<br />

OIL FLOW IN FLOAT<br />

The float position allows the free flow of oil from both the raise and lower ports of the remote valve permitting the<br />

cylinder to extend or retract freely. This feature is particularly useful to allow equipment such as scraper blades to<br />

‘float’ or follow the ground contour. See Figure 4<br />

When the remote valve operator control switch is moved to the float position the control spool is moved fully to the<br />

right via pilot line oil from the solenoid control unit, supplied from gallery (I).<br />

Oil flow from the gallery (B) to the raise and lower ports is blocked by the land of the spool end.<br />

The position of the spool causes the pin (7) on the lock valve to hold the valve in the open position.<br />

The raise and lower ports of the remote valve are open to reservoir gallery (G) allowing a free flow of oil from one port<br />

of the cylinder to the other.<br />

Should a void occur in the circuit oil will be drawn by suction from one side of the cylinder to the other.<br />

2 3/5/2007<br />

A.10.C / 16

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