| 摘要 |
<p>PURPOSE: To decrease a power loss of a pump, also to decrease a flow amount of generating heat by relieving it, so as to prevent overheating a hydraulic circuit, by selectively using a small capacity pump without using particularly a large capacity pump. CONSTITUTION: In a hydraulic circuit control method for a crane of performing steering operation or operating overhanging and contracting a single or/plurality of outriggers by a flow amount Q2 from a single oil hydraulic pump 2 and further operating a work machine and a turn device 5 by a flow amount Q1 of the other oil hydraulic pump 1, when operated steering with an engine speed in a prescribed value or less, or when overhung/contracted all the outriggers, the one oil hydraulic pump 2 is assisted by the other oil hydraulic pump 1.</p> |
