Common Fault Repair Methods for Forklift Frame

1，Inspection and repair of cracks in forklift frames. Cracks mostly occur in components with drastic changes in cross-section, connection points of components, and nodes with too many welds.

In places where cracks may occur, remove paint, dust and dirt to expose the metallic luster, and use a 6-8 times magnifying glass to check. You can also use the oil immersion quick-hit method to show the distribution of cracks. Drill holes with a diameter of 8-25mm at 10-15mm from both ends of the visible cracks. 

The grooves should be ground along the cracks before repair welding. After welding, check whether the weld has cracks. If there are cracks, use a grinding wheel to grind off the weld and re-weld. The length of grinding should exceed the tail of the obvious crack by 50-100mm. The new weld should be straight, dense, and truly welded through with a smooth transition.

2. There are dents or deformations on the forklift frame, side panels, and side beams. When the deformation is no more than six millimeters, it can be corrected by cold correction. However, cold correction can only be performed at an air temperature above 0℃.

During the correction, tools such as bow clamps and jacks can be used for correction. When the dents and deformations are large, the large deformations can be eliminated by rapid heating to 700-1100℃ or 900-1150℃.

When the temperature is lower than 700℃, the correction work should be stopped immediately, and the deformed part should be heated along the outer convex surface at the place where the deformation is large. After correction, the component should be cooled at an ambient temperature above 0℃.