Caterpillar Slewing Bearing 353-0490 For Cat349 Excavator

A1: The following are possible causes: First, uneven mounting surface or loose mounting bolts. When the unevenness of the mounting surface does not meet the requirements, the raceway will form a negative clearance, resulting in abnormal noise. Loose mounting bolts will also cause elastic deformation of the slewing bearing, resulting in a negative clearance and abnormal noise. Second, there are foreign objects inside the slewing bearing, such as sand or iron filings, which will cause non-periodic vibration and be accompanied by inflexible rotation. Third, there are problems with the grease, such as insufficient grease in the raceway, uneven grease filling, poor quality grease, aging grease, or improper selection. Fourth, the sealing strip is damaged, affecting the sealing effect and causing abnormal noise. Fifth, there are cracks, indentations, or rust on the rolling surface. Sixth, the raceway and rolling elements are severely worn.

A2: First, check if the maintenance is correct, whether the grease replenishment cycle is between 150-250 hours, and whether the replenishment is too frequent; second, open the inspection cover of the rotary gear ring lubricating grease and check if the lubricating grease has become thinner, and determine whether the hydraulic oil or gear oil of the rotary motor has leaked into the cavity of the rotary gear ring; then check whether the original grease added to the equipment is correct, and whether the leakage is caused by the grease becoming thinner; next, carefully check along the rotary oil seal to see if there are any missing, loose, or damaged parts; then determine whether the grease leaking is from the bearing cavity or the rotary gear ring cavity, which can be determined by adding grease of different colors; finally, observe whether there are any abnormalities in the rotation of the equipment, such as abnormal noises or instability. If so, it may be that the bearing clearance is too large and uneven, causing oil to be squeezed out from the outer oil seal.

A: If only minor tip wear occurs (without damage to the main tooth structure), professional grinding tools can be used to restore the sharpness of the cutting edge and extend its service life. If the wear depth exceeds 5mm (or there is chipping of the cutting edge or deformation of the main body), the entire tooth must be replaced to avoid uneven digging force transmission due to local structural damage, which may damage the bucket connection. It is recommended to inspect the tooth wear after each operation. When the wear reaches 1/3 of the total length (approximately 65mm), it is necessary to replace it promptly to ensure efficient operation.

A: While the bucket tooth structure doesn't need to be adjusted for different materials, efficiency can be improved by optimizing excavator operating parameters. When excavating soft soil/loam, increase the excavation speed appropriately and utilize the low-profile design of the bucket teeth to reduce material residue. When excavating hard rock/concrete, it's recommended to first locate the entry point using the tip of the tooth, then apply digging force slowly to avoid direct impact of the cutting edge on the hard surface. For further improved hard rock crushing performance, use the original Caterpillar bucket tooth protector (compatible with the Advansys 110 size) to enhance the cutting edge's resistance to chipping and extend its service life.