Variable pressure control system for dual acting actuators

A row cleaner downforce control system, comprising:

• a planter row unit including a furrow opening assembly configured to open a furrow in a soil surface when moving along a forward direction of travel;
• a row cleaner pivotally mounted to said planter row unit forward of said furrow opening assembly with respect to said forward direction of travel, said row cleaner having a frame and at least one wheel, said at least one wheel disposed to rollingly contact said soil surface when traveling along said forward direction of travel, said at least one wheel angled with respect to said forward direction of travel such that said at least one wheel throws debris on said soil surface to a side of said forward direction of travel;
• a dual acting actuator operably coupled to said row cleaner and a pressure source, said dual acting actuator having a down chamber and a lift chamber;
• and
• a controller in communication with said pressure source, said lift chamber and said down chamber and operable to control a down pressure in said down chamber and a lift pressure in said lift chamber from said pressure source;
• whereby increasing said down pressure in said down chamber increases a downforce applied by said at least one wheel on said soil surface, and whereby increasing said lift pressure in said lift chamber decreases said downforce applied by said at least one wheel on said soil surface.