| 摘要 |
PROBLEM TO BE SOLVED: To improve operating efficiency, and to reduce fatigue by installing a working machine or the like, approximately equalizing size (slewing radii) from the center of a revolving superstructure to the frontest end of a working- machine mounting section and a rearest end and making the confirmation of the interference of a rear section unnecessary in the case of slewing. SOLUTION: The maximum size L1 from the center of rotation 0-0 of the working car 1 to a working-machine mounting section 6 and maximum size L2 to the rear end (substantially the rear upstanding surface of a counterweight 21) of a machine body 4 are set at approximately the same values. When a slewing motion is repeated under the state in which a working machine 7 is intruded to a workshop, on which there is a low obstruction A or a high obstruction B, and lifted and held, subsequently only a front section or a rear section may be confirmed when whether or not the working machine interferes in A or B only at first by a driver is confirmed. Relation fins are mounted on a working fluid tank besides the formation of hollowed-out holes to a boom 7A, and arm 7D or the like and lightening, and an oil temperature rise is inhibited by the outside air and workability is improved. Accordingly, the fatigue feeling of the driven is reduced while operating efficiency can be improved.
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