| 摘要 |
The present invention addresses the problem, when actuation of an external hydraulic work machine is performed simultaneously with a turning operation, of keeping the actuation rate of the external hydraulic work machine from decreasing. A hydraulic apparatus of a hydraulic work vehicle that makes it possible to supply pressure oil to one of a bucket cylinder (20), an arm cylinder (21), a boom cylinder (22), a swing cylinder (25), a blade cylinder (13), a hydraulic turning motor (62), a hydraulic left travel motor (63), a hydraulic right travel motor (64) and a hydraulic PTO motor (65) using a first hydraulic pump (P1), a second hydraulic pump (P2) or a third hydraulic pump (P3), is configured so that pressure oil can branch off from a discharged oil passage (28) of the third hydraulic pump (P3) and be supplied via an external pipe (71) to the downstream side of a load check valve (46), which is provided in an oil passage that leads to a pump port (36p) of a PTO control valve (36) for switching oil delivery of pressure oil from the second hydraulic pump (P2) to an external hydraulic work machine (16). |
