Abstract: A housing for a hydraulic pump is provided. The pump has an input shaft connected to a swashplate, a plurality of pistons, a plurality of check valves, and a metering device having an actuator. The housing includes a first housing member having a fluid inlet, a shaft bore adapted to receive the input shaft, and a swashplate bore adapted to receive the swashplate. A second housing member has a plurality of cylinders adapted to slidably receive the plurality of pistons and a plurality of check valve bores that are in fluid communication with the cylinders and are adapted to receive the plurality of check valves. The second housing member also includes an actuator bore configured to receive at least a portion of the actuator, a collector cavity in fluid communication with each of the check valve bores, and a fluid outlet in fluid communication with the collector cavity.

Abstract: A hydraulic pump is provided that includes a housing having a fluid inlet and a fluid outlet. A pumping element is operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet. A control device is operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element. A fluid passageway connects the control device with the fluid outlet. A valve is disposed in the fluid passageway between the fluid outlet and the control valve. The valve is moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway.

Abstract: A housing for a hydraulic pump is provided. The pump has an input shaft connected to a swashplate, a plurality of pistons, a plurality of check valves, and a metering device having an actuator. The housing includes a first housing member having a fluid inlet, a shaft bore adapted to receive the input shaft, and a swashplate bore adapted to receive the swashplate. A second housing member has a plurality of cylinders adapted to slidably receive the plurality of pistons and a plurality of check valve bores that are in fluid communication with the cylinders and are adapted to receive the plurality of check valves. The second housing member also includes an actuator bore configured to receive at least a portion of the actuator, a collector cavity in fluid communication with each of the check valve bores, and a fluid outlet in fluid communication with the collector cavity. The second housing member is connected to the first housing member to maintain the swashplate in engagement with the plurality of pistons.

Abstract: A hydraulic pump is provided that includes a housing having a fluid inlet and a fluid outlet. A pumping element is operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet. A control device is operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element. A fluid passageway connects the control device with the fluid outlet. A valve is disposed in the fluid passageway between the fluid outlet and the control valve. The valve is moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway.

Abstract: A circuit for a hydraulic pump is provided. The circuit includes a supply of fluid. A pumping element is operable to increase the pressure of fluid received from the supply of fluid and to generate a flow of pressurized fluid. An inlet passageway connects the pumping element with the supply of fluid. A drain passageway is connected to the inlet passageway. A valve is disposed in the drain passageway. The valve is moveable between a first position where the valve prevents a flow of fluid relative to the drain passageway and a second position where the valve allows a flow of fluid relative to the drain passageway.