| 摘要 |
PROBLEM TO BE SOLVED: To improve the working efficiency when a counter weight is mounted and demounted to a vehicle. SOLUTION: In a case when the counter weights are loaded on a vehicle, a counter weight of second stage is hoisted in a state that a counter weight 1 of first stage is floated from the ground surface, the counter weight 2 of second stage is overlapped on the counter weight of first stage while positioning a hoisting ring 6a and a clearance groove, and both are fastened by a bolt 74a and a nut 74b. Similarly a counter weight 3 of third stage and a counter weight 4 of fourth stage are fastened by a bolt 75a and a nut 75b. Then the integrated counter weight 1 of first stage and counter weight 2 of second stage, and the integrated counter weight 3 of third stage and counter weight 4 of fourth stage are respectively hoisted to be fixed to a frame 64, whereby the working efficiency can be improved in comparison with an operation stacking the counter weights one by one.
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