| 摘要 |
The remote controlling hydraulic circuit in the excavators offers a safe and definite running mode while other functions e.g. arm crowding bomming, swinging, bucketting, dumping are operated. The hydraulic circuit comprises left/ right control valves (4,5) having spools which are position-controllable, first shuttle valve (10) having hydraulic lines for arm dump, left/right swing, boom- up, a pilot line (11) extended from the first shuttle valve, limit switches (7a,7b) serially connected to the left/right running spools (4a,5a) respectively, and a solemoid valve (12) trunsferring the pilot line (11)'s pressure to a position control part of a selection valve (3) according to the limit switches position.
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