The safety of the grapple grab is reflected in the safety of the grab material, because of the frequent closure and separate action, grab the hydraulic transmission components is the most prone to problems. Grab should be checked once a day, especially the heavy work of the grab, should be carefully checked. On the scrap to the standard components to be scrapped in time.

1. To check the edge of the wear and tear, the edge should not be skewed, there should be no cracks;

2. To check the wear of the pulley shaft and the wear of the rim;

3. When the bucket is open, the difference of the bucket mouth is not more than 20mm;

4. To check the wire rope of the fixed situation, wear and tear;

5. When the grapple is closed, the dislocation difference between the two horizontal and vertical cutting edges and the clearance of the bucket mouth shall not be greater than 3mm, and the length of the largest gap shall not be greater than 200mm;

6. After hoisting, the center line of the symmetrical center of bucket mouth and the vertical centerline of grapple shall not exceed 20mm in the same vertical plane whether the bucket is open or closed.