| 摘要 |
The present invention relates to an apparatus (10) for vertically moving a working tool of an agricultural tractor capable of performing up/down lift on a rotary or a plow without malfunction or trouble like an electronic hydraulic apparatus by including an up-down unit (30) having an automatic lift valve (51) moved by oil pressure supplied from a tractor hydraulic circuit and an up-down valve (61) making a rotary or a plow to move upward and downward by interworking with the automatic lift valve (51), and particularly, capable of being manufactured at low cost relatively to the electric hydraulic apparatus. |
