| 摘要 |
PROBLEM TO BE SOLVED: To restrain rising of a fuel temperature and prevent lowering of engine output and deterioration of fuel economy and smoke while operating an engine of a construction machine at a high temperature. SOLUTION: A radiator, an oil cooler, an intercooler, and a fuel cooler are integrally arranged. The fuel cooler 16 is arranged on a return line LR of the engine. The return line LR is switched to a line L1 extending to the fuel cooler 16 by a thermo-valve 19 at a high temperature so as to return the uninjected fuel to a fuel tank 18 after cooling. The return line LR is switched to a line L2 for bypassing the fuel cooler 16 by the thermo-valve 19 at a low temperature so as to return the uninjected fuel to the fuel tank 18 as it is.
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