Patent ID: 7665299

Claim:
A compact construction vehicle comprising: a frame; a lift arm supported by and pivotable with respect to the frame; a bucket supported by and pivotable with respect to the lift arm; an internal combustion engine on the frame, the engine having an output threshold below which the internal combustion engine operates and at which the internal combustion engine stalls; first and second fixed displacement pumps driven by the internal combustion engine to create a combined flow of pressurized fluid; a lift cylinder adapted to pivot the lift arm in raising and lowering directions in response to receiving pressurized fluid; a tilt cylinder adapted to pivot the bucket in curling and dumping directions in response to receiving pressurized fluid; an auxiliary implement adapted to perform work in response to receiving pressurized fluid; a main control valve receiving the combined flow of pressurized fluid, the main control valve including lift, tilt, and auxiliary spools, each spool having a center position, and each movable from the center position to direct the combined flow of pressurized fluid to the respective lift cylinder, tilt cylinder, and auxiliary implement; a power management system for preventing pressurized fluid from the second pump to flow to the main control valve when the pressure of pressurized fluid flowing to the main control valve exceeds a stall pressure indicative of the engine reaching the output threshold; and an auxiliary high flow mechanism for permitting the combined flow of pressurized fluid to flow to the auxiliary implement when the auxiliary spool is moved from its center position, without regard to whether the pressure of pressurized fluid flowing into the main control valve exceeds the stall pressure, wherein the auxiliary high flow mechanism includes a reference signal line providing a reference signal indicative of the auxiliary spool shifting off its center position the reference signal disabling the power management system from preventing pressurized fluid from the second pump to flow to the main control valve and to the lift, tilt, and auxiliary spools.