| 摘要 |
PROBLEM TO BE SOLVED: To reverse rotation of a cooling fan, while taking into consideration so as not to cause overheat of an engine. SOLUTION: In this cooling system of a construction machine, when the temperature (t) of cooling water for cooling the engine 21 becomes the preset temperature T or more having a danger of, for example, the overheat, a control part 20 prohibits a direction change in a hydraulic fluid by a control valve 31, and a cooling fan 33 reverses so as to restrain reduction in cooling capacity to the engine 21. COPYRIGHT: (C)2006,JPO&NCIPI
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