CodeReason for condition
Practical solution
5Dirt, sand, carbon, or other contaminants are entering the bearing housing.Clean the bearing housing. Replace worn seals or improve the seal design to obtain adequate bearing protection (fig 1).
6Water, acids, paints or other corrosives are entering the bearing housing.Install a protective shield and/or flinger to guard against foreign matter (fig 2). Improve seals.
Housing bore is out-of-round. Housing is warped or distorted. Supporting surface uneven.Check and scrape the housing bore to relieve pinching of the bearing. If necessary turn the housing bore to the correct dimension. Ensure that the supporting surface is flat and that the shims cover the entire area of the housing base (fig 3).
10Chips, dirt etc. were not removed from housing before assembling the bearing unit.Carefully clean (fig 4), and apply fresh lubricant.
Shaft diameter is too small. Adapter is not sufficiently tightened.Metallise and regrind the shaft to obtain the proper fit (fig 5). Retighten the adapter for a firm grip on shaft.
Unbalanced load.
Housing bore is too large
Rebalance the machine (fig 6).
Replace the housing with one having the proper bore.
22Flat spot on rolling element due to skidding. (Caused by fast starts.)Visually check the rolling elements and replace the bearing if a rolling element has a flat spot. Make sure that the requisite minimum load is applied to the bearing.
Unequal load distribution on the bearing due to out-of-form of shaft seat or housing bore.Rework the shaft and/or housing seat to obtain the proper form and fit (fig 7). The application may require a new shaft or housing .
25Shaft is bending due to incorrect shoulder diameter.Remachine the shaft fillet to relieve stress (fig 8). The application may require a shoulder collar. Check that abutment dimension is in accordance with SKF recommendations.
27Inadequate support in the housing is causing the outer ring to distort.Remachine the housing fillet to relieve stress (fig 9). Check that abutment dimension is in accordance with SKF recommendations. The application may require a shoulder collar.
29Shaft and inner ring are distorted.Remachine shaft fillet to obtain the proper support (fig 10).
30Housing and outer ring are distorted.Remachine the housing fillet to obtain the proper support (fig 11).
Incorrect linear or angular alignment of two or more coupled shafts with two or more bearings.Correct alignment by shimming the housings. Ensure that the shafts are coupled in a straight line, especially when three or more bearings operate on one shaft. Be sure to use full support shims (fig 12).
40Incorrect mounting method. Hammer blows to bearing.Replace the bearing with a new one. Never hammer any part of a bearing when mounting. Always use a mounting dolly or sleeve (fig 13).
43Excessive clearance in the bearing is causing vibration.Use a bearing with recommended internal clearance (fig 14). Apply spring load to the outer ring of the non-locating bearing to eliminate axial and radial play.
44Equipment is vibrating.Check the balance of the rotating parts (fig 15). Rebalance the equipment.
50"Pounding out" or hammering out of housing bore due to too soft metal. The resulting enlarged bore causes the outer ring to spin in the housing.Rebore the housing and press a steel bushing in the bore (fig 16). Machine the bushing bore to the correct size.
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