Product Overview: 300 top rail prevents the rail cranes due to strong winds generated crawling, especially for work in preventing sudden gust extremely effective. When powered down, the top of the block by the spring force of the clamping rail surface, so that the top part of the crane rail bear weight with the help of top block sliding rail surface friction resistance, play a role in anti-climb. When the body starts running, the pump station will rise top block, so that the normal operation of the crane, each with two sets of hydraulic cranes, with two or four top rail. The same can be used 96-04 type top rail. Product Features: Not the way the track laying and track the impact of debris blockage is installed, easy maintenance pump station with packing function and prolong the service life of hydraulic pump station does not work when the available hand pump so that the top block rises friction block gear structure with high hardness, friction coefficient and durable.