| 摘要 |
PROBLEM TO BE SOLVED: To smoothly actuate an ultra-small swing type backhoe for swing motion while folding a front device into a smaller size and reducing shocks, the backhoe having a cab portion and the front device juxtaposed on a turntable, with the boom of the front device capable of being driven to deflect sideways. SOLUTION: A load sensing system is provided in a hydraulic circuit used for controlling the actuation of the front device and of the turntable. Upon the detection of a boom erected by at least a set angle, the controlled differential pressure of the load sensing system is forcibly varied to reduce the discharge of a pump P1.
|
