| 摘要 |
A system to lock a roll-suspension arrangement operatively connected to allow pivotal movement of a boom assembly about a fore-and-aft axis independent of a carrier frame is provided. The system includes an actuator cylinder having an end movable in a linear direction relative to a fixed end. The fixed end of the actuator cylinder is connected at the carrier frame, and the movable end is connected at the boom assembly. The system further includes a lock valve located in fluid communication with the actuator cylinder. The lock valve in a closed position prevents a fluid flow therethrough so as to restrain movement of the actuator cylinder and rotation of the boom assembly with respect to the carrier frame. In an open position, the lock valve releases movement of the actuator cylinder so that the boom assembly freely pivots independently of the carrier frame.
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