Patent ID: 8430017

Claim:
A control device for a hydraulic motor, the control device comprising: a housing defining a first void, a second void, and a plurality of passages; a speed valve disposed within said first void and including a spring end and a pressure end spaced from said spring end along a speed valve longitudinal axis, wherein said speed valve is moveable between a first speed valve position and a second speed valve position, with said first speed valve position configured for operating the hydraulic motor at a first speed and said second speed valve position configured for operating the hydraulic motor at a second speed; wherein said first void includes a speed valve pressure chamber at least partially defined by said housing and said speed valve adjacent said pressure end of said speed valve; wherein said housing defines a speed change port and said plurality of passages includes a speed change passage interconnecting said speed change port and said speed valve pressure chamber of said first void, with said speed change passage configured for directing a control fluid directly into said speed valve pressure chamber of said first void from said speed change port to apply a pressure force to said speed valve along said speed valve longitudinal axis to move said speed valve between said first speed valve position and said second speed valve position; and a direction valve disposed within said second void and moveable between a first direction valve position and a second direction valve position, with said first direction valve position configured for operating hydraulic motor in a first direction of rotation and said second direction valve position configured for operating the hydraulic motor in a second direction of rotation opposite the first direction of rotation; wherein said speed valve is operable to change between said first speed valve position and said second speed valve position when said direction valve is disposed in either said first direction valve position or said second direction valve position.