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A power machine has a base, an operator support portion, and a hydraulic slew motor coupled to move the operator support portion relative to the base. A boom, an arm, and a tool are all coupled to one another and to the operator support portion and are powered by hydraulic actuators. A slew valve is

A power machine has a base, an operator support portion, and a hydraulic slew motor coupled to move the operator support portion relative to the base. A boom, an arm, and a tool are all coupled to one another and to the operator support portion and are powered by hydraulic actuators. A slew valve is coupled to receive hydraulic fluid under pressure from a hydraulic power circuit and is also coupled to the slew motor to provide hydraulic fluid to the slew motor and receive hydraulic fluid from the slew motor. A first power actuator valve is coupled to receive hydraulic fluid from the slew valve and is coupled to provide hydraulic fluid to one of the hydraulic boom actuator, the hydraulic arm actuator and the tool actuator. The slew valve is coupled in series with the power actuator valve.

대표청구항 ▼

[ What is claimed is:] [1.] A power machine, comprisinga base;an operator support portion coupled to the base;a hydraulic power circuit providing hydraulic fluid under pressure;a hydraulic slew motor coupled to move the operator support portion relative to the base;a boom coupled to the operator sup

[ What is claimed is:] [1.] A power machine, comprisinga base;an operator support portion coupled to the base;a hydraulic power circuit providing hydraulic fluid under pressure;a hydraulic slew motor coupled to move the operator support portion relative to the base;a boom coupled to the operator support portion;a hydraulic boom actuator coupled to the boom to move the boom relative to the operator support portion;an arm coupled to the boom;a hydraulic arm actuator coupled to the boom and the arm to move the arm relative to the boom;a tool coupled to the arm;a tool actuator coupled to the tool to move the tool relative to the arm;a slew valve coupled to receive the hydraulic fluid under pressure from the hydraulic power circuit and coupled to the slew motor to provide hydraulic fluid to the slew motor and receive hydraulic fluid from the slew motor; anda first power actuator valve coupled to receive hydraulic fluid from the slew valve if the hydraulic fluid is first provided by the slew valve to the slew motor and then returned to the slew valve from the slew motor and if the hydraulic fluid is not provided to the slew motor by the slew valve, the first power actuator valve being coupled to provide hydraulic fluid to one of the hydraulic boom actuator, the hydraulic arm actuator and the tool actuator.