Abstract: A hydraulic device includes a gerotor assembly, a wobble stick, an output shaft, a housing assembly, a first port in the housing assembly, a second port in the housing assembly, first brake disks, second brake disks, a piston, and a biasing member. The gerotor assembly includes a rotor and a stator. The wobble stick connects at a first end to the rotor. The output shaft connects to a second end of the wobble stick. The housing assembly receives the gerotor assembly, the wobble stick and the output shaft. The first port is in communication with the gerotor assembly. The second port is also in communication with the gerotor assembly. The first brake disks connect to the output shaft The second brake disks connect to the housing assembly The piston is disposed in the housing assembly adjacent at least one of the brake disks. The piston cooperates with the housing assembly to define a brake pressure chamber.

Abstract: A hydrostatic transmission assembly includes a first gerotor motor, a pump housing, a first variable displacement pump, a second gerotor motor, and a second variable displacement pump. The first gerotor motor includes a first output shaft aligned along a first axis. The pump housing connects to and contacts the first gerotor motor. The first variable displacement pump includes a first driven shaft mounted to the pump housing and aligned along a second axis, the second axis being generally perpendicular to the first axis (the first output shaft axis). The first variable displacement pump is in fluid communication with the first gerotor motor via passages in the pump housing. The second gerotor motor includes a second output shaft generally aligned along or generally parallel to the first axis. The second gerotor motor is connected to the pump housing on an opposite side of the pump housing as the first gerotor motor.

Abstract: A wobblestick with driving teeth with a helix which is equal to or less than 1° of the running angle of the wobblestick.

Abstract: A fixture for selectively locating and retaining hydraulic gerotor rotors in position in respect to a grinding wheel, the fixture clamping the rotor between two oversized positioning rolls located in rotor lobe valleys on opposite sides of the rotor.

Abstract: A hydraulic gerotor motor utilizing the holes surrounding the main assembly bolts together with interconnecting radially extending passages so as to allow for the transfer of fluid axially through the device from a single fluid input hole to an area 360° surrounding a valve.