1. During the level maintenance, it is necessary to check the parts of the fifth wheel, especially check the wear of the fifth wheel, the fifth wheel, the half horizontal shaft, etc., and lubricate these parts; tighten the bolts of the supporting seat, and replace the bolts if necessary; Adjust the matching gap between the lock hook and the traction pin. The adjustment method is to adjust through the adjustment screw, and lock it through the nut after adjustment.
2. When disassembling the traction seat for inspection, pay attention to check whether the traction seat itself has cracks or severe wear. If there are cracks or severe wear and the traction seat is deformed or too thin, replace it with a new one; check the lock hole and use the traction pin for matching detection , if the wear exceeds the limit and the fit gap is large, it can be repaired by overlay welding and processed to the required size, or the lock hook, lock block and wear-resistant ring can be replaced; check the fit gap between the support and the body, if the fit is loose, then Replace the rubber elastic bushing; check the locking mechanism, the detachment and connection should be smooth and crisp, and the safety device should be stable and reliable. Replace with new ones.