| 摘要 |
PURPOSE:To facilitate the control and maintenance of a rear gate lifter by automatically feeding oil to a lift chain. CONSTITUTION:When operating oil is fed from a hydraulic pump P to a cylinder side hydraulic chamber 27a, a piston 29 is extended, and a rear gate is lifted. At this time, a selector valve 33 is at a neutral position 33a. Next, when the selector valve 33 is switched to a return position 33b, the operating oil in the cylinder side hydraulic chamber 27a is returned to a hydraulic tank T through a return circuit 31 by its own weight. Subsequently, a cargo is lifted or lowered via the up-and-down movement of the rear gate. In this case, the operating oil leaked from the cylinder side hydraulic chamber 27a is dripped through an outflow port onto the lift chain 17 in a piston side hydraulic chamber 27b in operation. Accordingly, the lift chain 17 is smoothly operated. |
