Making provision for the job on vehicle liquid

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic control device for a work vehicle, capable of restraining vibration generated in loading travel, regardless of a weight change in a front part.;SOLUTION: This hydraulic control device has a boom cylinder 3 provided in a wheel loader, a operation valve 16 for controlling pressure of a bottom side pressure chamber 3a of this boom cylinder 3, an accumulator 7 connected to the bottom side pressure chamber 3a of the boom cylinder 3 via a connecting pipe 9, an opening-closing valve 5 having a pilot chamber 5a and switching communication and cutoff of the connecting pipe 9 in response to pressure of the pilot chamber 5a, and a switching means for switching supply and discharge of the pressure to the pilot chamber 5a; and is constituted so that this switching means includes a controller 21 for variably controlling opening of the opening-closing valve 5.;COPYRIGHT: (C)2006,JPO&NCIPI