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我部一台上海１２０推土机在使用过程中出现铲刀自动下沉的故障。当铲刀置于某一高度时，在重力的作用下，两液压缸活塞杆同时伸出且速度很快。造成这一故障的原因是： 换向阀阀杆处于中位（闭锁位置）时，铲刀液压缸与相应的换向阀形成的封闭油路中的高压腔发生了泄漏。 因外?
I am a Ministry of Shanghai 120 bulldozers in the process of automatic blade sinking failure. When the blade is placed at a certain height, the pistons of both cylinders stick out at the same time and are very fast under the action of gravity. The reason for this failure is that when the valve stem of the reversing valve is in the neutral position (closed position), the high pressure chamber in the closed circuit formed by the blade cylinder and the corresponding reversing valve leaks. Because of outside?