| 摘要 |
PURPOSE:To hinder more than specific pressure from being acted upon a working pressure chamber of a neutral lock actuator by preventing a direction control actuator and the neutral lock actuator from exerting influences upon each other even if the direction control actuator and the neutral lock actuator are controlled in the same hydraulic circuit. CONSTITUTION:An electromagnetic control directional control valve 2 is arranged in a main passage to connect a direction control actuator 3 and a pump P to each other, and the first pressure sensitive directional control valve A is arranged between this electromagnetic control directional control valve 2 and the pump P. The second pressure sensitive directional control valve B and a check valve 5 are arranged in the first branch passage 4 branched off from the main passage 1, and a neutral lock actuator 6 and an electromagnetic communication valve C are arranged downstream of this check valve so as to be in parallel with each other. The downstream part of the electromagnetic communication valve C is connected to a tank T, and a pilot passage 13 branched off from upstream thereof is set to apply pilot pressure to the first pressure sensitive directional control valve A. |
