| 摘要 |
PURPOSE:To reduce a cost and to simplify a piping work by a method wherein pressure oil from a single hydraulic pump is first fed to a power steering circuit and a mounting demounting work device circuit, and return oil to the mounting demounting work device circuit is fed to a 3-point link circuit and an HST circuit. CONSTITUTION:A hydraulic division part 3 is mounted on the delivery side of a hydraulic pump 2 driven by an engine 1, and pressure oil is branched to a power steering circuit A and a working machine oil passage 5 by means of a flow priority valve 4. A switching valve 7 is situated in an oil passage to a front loader circuit B having a boom cylinder 12 and a bucket cylinder 13, and during OFF-operation of the switching valve 7, return oil to the circuit B can be fed directly to a back hoe oil pressure take-out block 15. Pressure oil can be fed from the block 15 to a back hoe circuit C through an external hose 18 and to a 3-point link circuit D through a control valve 28. Pressure oil flowing through the power steering circuit A and the control valve 28 is fed to an HST circuit E. |
