Hydraulic system for small-sized excavator to improve bucket speed

摘要

The present invention relates to a hydraulic control device of a small excavator, provided to the confluence valve 104 for joining the pressure oil discharged from the third pump (P3) when moving the bucket 110, boom 120, arm 130. By preventing the run is prevented and running accurately, as well as to connect the confluence switch 102 and the pilot pressure switch 103 to the confluence valve 104 to control the confluence of the foreclosure to control the confluence of the confluence To prevent sudden operation.