Operation
5-22 August 2014 C2 Contour Air Drill
Opener Hydraulics - Continued
Normal Operation - Continued
To raise the openers, oil ows from the tractor hose to port “B” of the valve block and out of port “E” to the opener
valve and on to the gland side of the cylinders. Oil is also felt on the line that operates the pilot operated check valve.
This causes the check valve to open and allow return oil back to the tractor.
Oil from the butt side of the cylinders travels to port “D” and through the opened pilot operated check valve to the
pressure relief valve. Oil can not go through the relief valve in this direction and is directed to the one way check
valve. The oil then travels through the one way check valve to port “A” of the valve block.
The oil ows through the port “A” of the valve block and back to the tractor.
Oil is also felt on the line that operates the directional lock out valve. This causes the directional lock out valve to
close preventing the oil in the accumulator from returning back to the tractor. The directional lock out valve maintains
the pressure in the accumulator in this position.
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