Many people say that when there is a problem with the quality of bearings, they say that the bearings are refurbished. Subjectively, they think that refurbished bearings are synonymous with fake and inferior bearings.
How to Identify Refurbished Bearings
How to distinguish refurbished bearings?How to Identify Refurbished Bearings
Observe the appearance of the bearing. After all, the recycled refurbished bearing is used. Even if it is cleaned, the traces of use can be seen on the bearing; Look at the bearing lubricating oil or antirust oil. After a short year of storage, the antirust oil in a single box will be fixed, while the newly applied antirust oil should be the one without fixed.How to Identify Refurbished Bearings
The smell here is the smell. When the bearing is opened, there is usually a fresh grease smell in the refurbished bearing. Please note that this is not the real grease smell, but the antirust oil applied on the outside. Because the production tools of the refurbished workshop are simple, there is often no professional antirust powder, and the engine oil is used as the antirust oil.How to Identify Refurbished Bearings
Ask the seller, don’t be stingy about the doubt, say it without hesitation, observe the seller’s reflection, and then make a decision.How to Identify Refurbished Bearings
If you carry inspection tools with you, you can easily judge whether the bearing is a refurbished bearing by detecting the internal and external diameter accuracy and clearance of the bearing
Even when some internationally renowned brands such as NSK Bearings, Schaeffler and SKF bearings are used and the bearings are damaged due to installation or other problems, they are considered to have renovation problems.
In fact, refurbished bearings are just a popular name. The so-called refurbished bearings have two situations:
One is the recycled used bearings, which can be divided into many situations. The main situations encountered are the refurbishment of the bearings after dismantling the equipment after mass elimination, and the waste bearings treated at a low price after regular maintenance.How to Identify Refurbished Bearings
Generally, this kind of bearing has been used, but it is only a matter of good or bad use. However, scratches will occur on the inner and outer rings and end faces, and the internal rollers, raceways and retainers have been worn. Some illegal vendors recycle the bearing at a low price and refurbish it.
It mainly includes:
Clean small and micro deep groove ball bearings, ultra fine grinding, oil change, seal ring or dust cover, and then repack them for sale.
Large bearings are treated differently according to the wear conditions, including fine grinding of inner and outer rings, fine grinding of rollers and acid treatment of retainer (corroding the external oxidized copper to show a more beautiful appearance) or replacing parts.How to Identify Refurbished Bearings
This kind of bearing can not meet the tolerance requirements and rotation accuracy requirements of normal bearings in accuracy, so it has a great impact on customers in secondary sales. This kind of bearing is mainly sold in retail because of the small quantity and many styles recovered.How to Identify Refurbished Bearings
Another is to recycle a large number of unused bearings, including many imported and domestic bearings.
Generally speaking, the enterprises dealing with such large quantities of bearings are local pillar enterprises, which are disposed of due to the overstock of materials caused by production change or bankruptcy.How to Identify Refurbished Bearings
Because it belongs to a single model and has a large number, it is mostly wholesale sales. The main sales channel is peer transfer or secondary sales.How to Identify Refurbished Bearings
Generally, this kind of bearing product has bearing quality except that the service life of the bearing with grease has expired. It can be sold after simple cleaning and antirust packaging of the bearing. It does not affect the use in quality, but it is not favored by people because of bearing renovation.How to Identify Refurbished Bearings