| 摘要 |
[PROBLEMS] To drive a tilt cylinder and angle cylinder at a comparatively slow speed while driving an additional actuator at a high speed. [MEANS FOR SOLVING PROBLEMS] A hydraulic drive device includes a tilt cylinder (9) for rotating a blade (7) in the right-left directions and front-rear directions, an angle cylinder (10), an additional actuator (27) for operating an additional attachment, a tilt/angle pressure oil supply means having a tilt/angle direction control valve (19) for controlling the pressure oil flow supplied to one of cylinders (9, 10) and a selector valve (20) for supplying pressure oil flowing from the direction control valve (19) to one of the cylinders (9, 10), and additional actuator pressure oil supply means for supplying pressure oil to the additional actuator (27) independently from the tilt/angle pressure oil supply means. The additional actuator pressure oil supply means has an additional actuator direction control valve (29).
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