1, bearing

Qualified ball bearings is imported high quality bearing steel , its inside and outside ring and maintains a in wipe after oily-type should be as bright as lens, the hand should be as smooth exquisite like glass; The ring on the face should be engraved with code, the place of origin and manufacture date, such as identification, and clearly visible; Maintains a rivet should be evenly between rivetting, rivets and not head just wide. Use hand supporting inner loop, the other hand in the swirling ring, outer ring should be able to quickly turn freely, then gradually stopped; Outer rings marking, every time stood still, a sign the stop position should be the same; His hands were grabbed both inside and outside the ring, in radial and axial up do relative movement, there shall be no gap feeling, larger bearings can feel that gap, but should be no clang. The completion of check and decided to buy, hardness testing can be (and businesses, such as hardness first agreed that do not comply with the return) : with a file or a hacksaw broken chi to article file or cross bearing outer ring and inner, should be a "gurgling" sound and have no the crumbs, no scratches or only not obvious fine marks. If bearing identification fuzzy, appearance without luster, shaking have clearance, outer ring at the same position spin stop, delimit the file is at the end of the crumbs or scratch and maintains a rust stains wait for a phenomenon, explain quality is not qualified bearings.

2. Oil seal

Qualified rubber oil seal surface should be smooth, without defect deformation, side have code number), the specifications and manufacturers, such as identification, oil seal on the circumference of the blade shape and thickness should be consistent, and fittings changing outfits, the blade in the shaft neck should be strict joint; Take the framework should be regular shape oil seal face positively round, flat glass surface with joint without buckling; WuGuJia outer seal shall be regular, holds that the deformation, let go after restorable; With the spring spring should be no oil rust, no deformation, each spring in the lips mouth without relaxation, FAG if oil seal have appearance is bearing, defect, elastic abate, lips mouth uneven thickness, spring corrosion phenomena, explain quality is not qualified.

3. V belt

 
SKF bearing qualified V belt surface smooth, seamless joint glue pick up. Outer periphery clarity of trademark, specifications, manufacturer, such as identification, the same type of V belt length should be consistent. If the V belt appearance rough, rough glue joint or speak, margin with shade thrum show, no logo or logo illegible, each V belt length different, explain the lemon.



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