Valve System For Flushing Contaminated Hydraulic Fluid

An off-highway implement, comprising:

• a frame supported by a plurality of wheels;
• a set of ground engaging tools supported by the frame, the set of ground engaging tools including a hydraulic cylinder arranged with respect to the frame for raising and lowering the set of ground engaging tools, the hydraulic cylinder comprising a base, a base port, a rod and a rod port, wherein the rod is configured to extend from the base when hydraulic fluid is supplied to the base port and returned from the rod port, and wherein the rod is configured to retract toward the base when hydraulic fluid is supplied to the rod port and returned from the base port;
• a connector configured to supply hydraulic fluid in a supply line and return hydraulic fluid in a return line when connected to a hydraulic power source;
• a plurality of electronically controlled valves, the plurality of valves including a first valve configured to supply hydraulic fluid from the supply line to the hydraulic cylinder when activated, a second valve configured to return hydraulic fluid from the hydraulic cylinder to the return line when activated, and a third valve configured to bypass the first and second valves by redirecting the hydraulic fluid from the supply line to the return line when deactivated;
• and
• a controller in communication with the plurality of valves, the controller executing a program stored in a non-transient medium to:
• execute an operation to enable filtering of the hydraulic fluid supplied through the connector by simultaneously deactivating the first and second valves to block hydraulic fluid with respect to the hydraulic cylinder while deactivating the third valve to redirect hydraulic fluid from the supply line to the return line.