TROUBLESHOOTINGSECTION IXCorrosionWater, acid and corrosive materials formed bydeterioration of lubricant, will produce a reddish-browncoating and small etched holes over outer and exposedsurfaces of the race. Corrosive oxides also act aslapping agents.Shaft FitsBearing fits on rotating shafts are usually specified astight. Excessive looseness-even .001"-under a load,produces a creeping or slipping of the inner race on therotating shaft. The result is that surface metal of theshafts scrub or wear off. The force causing the innerrace to rotate disappears when the bearing fits properly.Installation and Removal of BearingsImproper installation or removal of bearings, especiallyhammering the bearing on the shaft with off-centerblows, can result in brinelling. Since such damage isseldom visible, it does not become known until afterfailure or complete disassembly. The correct drivers(preferably under an arbor press) and pullers should beused.Removing bearings is more difficult than installing them.In most cases, it is necessary to remove the bearing bypulling on the outer race, which can damage the balls orraces. Therefore, it is a good Idea to replace bearingsduring an overhaul, to prevent problems. However, if abearing is not going to be replaced, avoid removal duringlow mileage rebuilds.InterchangeabilityAll ball bearings, whether manufactured here or abroad,are interchangeable in regard to standardizeddimensions, tolerances, and fits. However, for a givenshaft size there are standard bearings for light, medium,and heavy duty service.Numbers and symbols stamped on inner and outer racesof bearings designate size and type. Note that thenumbering systems of different bearing manufacturershave not been standardized. Consult interchangeabletables and use the proper bearings for replacementparts.28
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