| 摘要 |
Single and dual hydraulic piston pump units comprising at least one pump unit including a variable displacement axial piston main pump rotatably journalled within an at least one pump housing, and operatively interconnected for dual pump units, the pump housing(s) being of a size having an integral fluid reservoir for the at least one pump unit, the reservoir including a drain port and plug and the housing including an air venting device. A block portion includes at least one pair of reversible fluid inlet and outlet ports and a fluid filter connecting portion. At least one center through shaft drives the main pump(s), the charge pump, and a cooling fan. A single pump unit in combination with a rotatable electric motor comprises a portable hydraulic power-producing unit. A dual pump unit in combination with a vehicle, having independently hydraulic motor-driven left and right wheels, permits independent wheel propulsion thereof.
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