Grab the safe use and inspection: rounded corners should always check the smoothness of the shell at the exit of the wedge, if rough or sharp edges grind, shall re-file smooth fillet. Always check the wear grab each hinge point axis. When the hinge shaft wear up to 10% of the original diameter, replace the hinge axis. When bushing wear more than 20% of the original thickness, grab mine factory, replace the bushing. Each hinge point should always greased. Grab classification: there is a structural principle of imitation scissors scissor grab, its gripping force can gradually increase with the jaws closed, grab mine, in the closed end of the maximum; its bucket mouth area opening and the cover material than the average for the big grab, improved ability to crawl, help clean yard and cabin.