Focus on Komatsu and Hitachi Excavator Slewing Bearings

We maintain a particularly strong stock of parts for leading brands like Komatsu and Hitachi. Whether you need a Komatsu Slewing Bearing for a smaller PC15 or a massive PC1250, or a Hitachi Slewing Ring for an older EX model or a modern ZX machine, Growshine International can supply the part quickly. Our sourcing strength is built on years of providing reliable construction equipment parts and working directly with manufacturers to ensure both quality and affordability. This makes us a prime choice for your heavy machinery parts procurement needs. Visit our websites ar-excel.com and ampleresiliencesoft.com for our full product catalogs.

Komatsu Slewing Ring Bearings

Troubleshooting: Excavator Slewing Ring Failure

A common issue with heavy excavators, such as the Komatsu PC400LC-5 (Part Numbers like 208-25-52101), is premature slewing ring failure. This usually presents as excessive rotational play, grinding noises during swing, or a jerky/stiff swing motion. The primary cause is often bearing race damage due to improper lubrication, contamination (e.g., dirt ingress), or excessive overloading/impact.

Solution: The first step is immediate inspection for loose mounting bolts or excessive grease leakage. If the bearing has significant play (measured with a dial indicator according to service manual specs, typically exceeding 5-10mm at the tooth pitch circle diameter), replacement is mandatory. When replacing the PC400LC-5 slewing bearing (e.g., 2082552101), ensure the mating surfaces on the frame are clean, flat, and free of defects. Use high-strength mounting bolts, follow the correct torquing sequence (usually a multi-stage process), and ensure the new bearing is properly lubricated upon installation and regularly thereafter with the correct grade of grease. Proper maintenance extends the lifespan of these vital construction machine wear parts, saving on heavy equipment repair costs.