Excavator Bearings and Bushings: Swing Bearing, Final Drive Bearings and Pivot Bushings Explained
Bearings are the quietest parts on an excavator and the most expensive to get wrong, because they are almost always buried. A swing bearing is a day of crane work to change; a final drive bearing means removing the travel gearbox. Getting the dimension or the grade wrong on either is not an inconvenience — it is a second day of down time. This guide covers where bearings live, what each failure looks like, and the measurements needed before a bearing can be quoted. Guangzhou Shenyue Machinery Technology Co., Ltd. has supplied these parts since 2007 and holds 3,000+ part types on the shelf in Guangzhou.
Corbay is the international export brand of Guangzhou Shenyue Machinery Technology Co., Ltd., Guangzhou, China. Bearings are a category where the export brand is genuinely useful: the same bore and the same load rating sit inside machines from a dozen manufacturers, so a supplier working across more than 100 brands can identify a replacement from dimensions alone when the part number has been lost to twenty years of work.
Where Bearings Live on an Excavator
Bushings: The Cheapest Part With the Highest Leverage
Boom, arm and bucket pivot bushings hold an excavator's geometry together. When they wear, the pin rattles, the bucket develops play, and the load starts being carried by the pin bosses and the cylinder instead of by the bushing designed for it. Because bushings cost a fraction of the structures they protect, replacing them on schedule is the highest-return maintenance an owner can do. Our catalogue carries items such as an arm bushing referenced as LC12B02199P1 for SK350-10 class machines. Measure the pin, measure the bore, and if the bore is oval the boss may need line-boring rather than a new bush.
How Each Failure Presents Itself
Measure First — Every Time
Bearings and bushings are dimensioned products, and dimensions travel across brands in a way part numbers do not. Bore, outside diameter, width, clearance, seal type and load direction usually specify a replacement; on a swing bearing, the mounting hole pattern and race diameter are the controlling figures. Where the original part number survives it is faster to quote from it; where it does not, a caliper reading plus a photograph of the failed part will usually do the job. Quality references from established manufacturers such as SKF are a useful benchmark when comparing grades, because a bearing is one of the few parts where the specification genuinely is the product.
Grades and Where It Is Worth Paying More
Every bearing line carries its grade in writing: genuine, OEM-quality or aftermarket. On the swing bearing and final drive gearbox bearings the labour to change the part dwarfs the price difference, so the best grade available is almost always the right decision. On exposed undercarriage rollers and small bushings, which are cheap to replace and frequently damaged by the environment, a good aftermarket part is rational. What is not rational is an unlabelled bearing where failure means removing the travel gearbox.
What We Need to Quote a Bearing or Bushing
Send five things: the bearing or bushing part number, or the dimensions if the number is gone; the machine model and serial number; the position on the machine and a photograph of the failed part; the quantity; and the destination port. Quotations normally come back within 24 hours, with each grade priced on its own line and the maker named, and photographs of the actual parts before the carton is sealed. If you are rebuilding a travel gearbox or a swing group, ask for the complete bearing set as one kit — it is cheaper than buying the bearings one failure at a time.
Bearings and Bushings — FAQ
Measure, Then Order
The measurements take ten minutes and decide between one delivery and three. Send the numbers with the machine details and the team at Guangzhou Shenyue Machinery Technology Co., Ltd. will confirm the correct bore, clearance and grade, quote it honestly, and show you the actual part before it leaves Guangzhou.
Corbay Excavator Parts is the international export brand of Shenyue Machinery (Guangzhou Shenyue Machinery Technology Co., Ltd.), Guangzhou, China. Shenyue is an independent parts specialist and is not affiliated with, or an authorized dealer of, Kobelco Limited. Parts are supplied as genuine, OEM or clearly identified aftermarket items, and the grade is stated on every quotation.