| 摘要 |
A backhoe having a stick cylinder and bucket cylinder selectively operable with a hydraulic control system having separate pumps to supply hydraulic fluid under pressure to the stick and bucket cylinders. Each pump delivers hydraulic fluid to a primary valve which gives the pump priority to a single cylinder. A second valve is operable to combine the hydraulic fluid output from both pumps to a single cylinder, thereby increasing the speed of operation of the cylinder. When both cylinders are operated at the same time, each cylinder receives the hydraulic fluid from its priority pump. An air control system, operable with high and low air pressure, is used to selectively operate the hydraulic control system.
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