| 摘要 |
PROBLEM TO BE SOLVED: To enhance working efficiency by eliminating troublesome operation such as restarting an engine by stopping the engine cone when switching normal/ reverse rotation of a cooling fan. SOLUTION: A directional control valve 120 is provided with a normal rotation position A for normally rotating the cooling fan 36, a reverse rotation position B for reversely rotating the cooling fan 36, and a stopping position C for stopping rotation of the cooling fan 36. Then, the directional control valve 120 is switch-controlled to switch the cooling fan 36 to normal rotation and reverse rotation as well as to stop the rotation of the cooling fan when switching the normal-reverse rotation. |
