| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic actuation apparatus capable of actuating a predetermined actuation device in response to operation of an operation lever when simultaneously actuating a plurality of actuation devices.SOLUTION: A power shovel includes: a right traveling operation lever for performing operation for actuating a right traveling motor 9R; a right work operation lever for performing operation for actuating boom cylinder 15; and an aperture adjusting valve 34 arranged between a main hydraulic pump 30 in a main oil passage 31 for supplying hydraulic oil from a main hydraulic pump 30 to a boom cylinder 15 through a boom control valve 60 and a boom control valve 60 to change an aperture area of the oil passage on the position. The aperture adjusting valve 34, when both of the right work operation lever and the right traveling operation lever are not operated or only either one of the levers is operated, sets the aperture area to an open state, and when both the right work operation lever and the right traveling operation lever are operated, sets the aperture area to a value smaller than that of the open state. |
