| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction machine comprising a new preheating unit that can efficiently preheat the whole of a circulation path through which fluid flows, and a preheating method thereof.SOLUTION: A circulating path 60A through which fluid is circulated is provided with a bypass path 66, and the bypass path 66 comprises a preheating unit 67 comprising a heater 67a and a bypass pump 67b. According to such a structure, the whole of the circulating path 60A can be efficiently preheated because the fluid can be heated while the fluid is circulated via the bypass path 66 even if the circulation of the fluid is stopped in the circulating path 60A. In addition, excellent versatility can be realized because it can be attached to the existing circulating path 60A afterward. |
