Abstract: The invention relates to an actuator for heavy machinery including a cylinder, a piston and a protective sleeve. The cylinder forms a chamber for receiving a fluid, and includes an external flange extending radially and outwardly from the cylinder. The piston is operable to translate axially relative to the cylinder between an open position and a closed position, and includes a first extremity positioned outside the cylinder and a second extremity positioned within the chamber. The second extremity sealingly engages the chamber. The protective sleeve protects the piston in the open position, which is movable with the piston and operable to overlap at least a portion of the cylinder in the closed position. The protective sleeve includes an internal flange extending radially and inwardly from the protective sleeve and is positioned for abutting the external flange when the piston is in the open position. This abutment limits the axial translation of the piston out of the cylinder.

Abstract: A motor-driven hydraulic rotator assembly for use on articulated-boom excavating equipment, or the like, for rotating and actuating an operable attachment. The rotator assembly comprises concentric tubular oil distribution channels located within the load-bearing shaft and drive assembly. In a preferred embodiment, the motor comprises a hydraulic pressure relief valve to decrease a low pressure side of the motor.

Abstract: A rotor assembly for rotating and actuating a working implement, comprising a load-bearing shaft adapted to be mounted to a boom member displacing the rotor assembly. Actuation means are secured to the load-bearing shaft. A drive assembly is rotatably mounted about the load-bearing shaft and is coupled to the actuation means. The drive assembly is adapted to be connected to a working implement so as to transmit actuation from the actuation means to the working implement to drive the working implement about the load-bearing shaft. A collector assembly is rotatably mounted to the load-bearing shaft and is adapted to receive a pressure supply therefrom. The collector assembly is provided with connector means adapted to provide the working implement with the pressure supply.