| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a warming-up system that can prevent response delay of a pilot pressure control valve when air temperature is low, and that allows a system for preventing the response delay to be constructed at low cost. <P>SOLUTION: A warming-up system includes: pilot pressure control valves 34, 79, 80 for controlling a pressure of pilot oil discharged from a pump P2 and transferred to an object to be supplied; and a valve body 35 mounting the pilot pressure control valve 34. A heat-up oil passage w to which the pilot oil discharged from the pump P2 is flowed is formed in the valve body 35. The valve body 35 is heated-up by flowing, via a relief valve 52 or a choke, the pilot oil flowed in the heat-up oil passage w to a hydraulic oil tank 31. <P>COPYRIGHT: (C)2013,JPO&INPIT |
