Troubleshooting guide
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Problem: Overheating
Possible cause Solution
Shaft oversize. Bearing running tight. Provide shaft with correct tolerance. Contact Cooper technical department.
Aluminum triple labyrinth seal rubbing. Seal bore and labyrinth should be greased during installation.
Housing overpacked with grease or oil level too high. Bearing will purge excess grease through seals. Oil lubrication - reduce level to just below cage.
Wrong type of grease or oil causing lubricant breakdown. Consult reliable lubricant manufacturer for proper type of lubricant or contact Cooper technical department.
Low oil level. Insufficient grease. Oil level should be just below cage outside diameter. Add proper grease.
Inner race rubbing against seals. Check clamping ring screws to make sure inner race is tight on
the shaft. Make sure the expansion bearings is mounted properly with rollers positioned on outer race.
Incorrect shaft alignment. Recheck alignment.
Bearing selected with inadequate internal clearance for high temperature operation. Contact Cooper technical department.
Oil lubrication hole blocked. Grease passage blocked. Inspect and clean holes. Refill to proper level.
Two fixed bearings on common shaft. Excessive shaft expansion. Remove one bearing and replace with an expansion bearing.
Pinching of bearing. Make sure entire area of pedestal base is supported.
Bearing cartridge not aligned.

Lubricate cartridge spherical with anti-seize compound, with
pedestal cap in place and cap bolts loose, rotate or run shaft with a few revolutions while under load. Re-tighten cap bolts.

Problem: Noisy bearing
Possible cause Solution
Foreign matter or corrosive agent entering bearing. Remove and inspect bearing. Clean and re-lubricate bearing and seals.
Undersize shaft. Measure shaft for proper fit. Refer to Cooper technical department.
Inner race rubbing against seals. Check clamping ring screws to make sure the inner race is
tight on shaft. Make sure the expansion bearing is mounted
correctly with roller positioned on the outer race.
Improper mounting of bearing. Inspect bearing. Check all match marks coincide. If parts are damaged, replace with new bearing.
Aluminum triple labyrinth seal rubbing. Seal bore and labyrinth should be greased during installation.
Low oil level. Insufficient grease. Oil levels should be just below cage outside diameter.
Add correct grease.
Wrong type of grease or oil causing lubricant breakdown. See lubrication section or contact Cooper technical department.
Bearing selected with incorrect internal clearance. Contact Cooper technical department.
Shaft does not contain a fixed bearing. Remove and replace with fixed bearing.
Two fixed bearings on common shaft. Remove one and replace with an expansion bearing.
Unbalanced load. Re-balance machine.
Bearing exposed to vibration while machine is idle. Examine bearing for brinelling separated by the distance equal to spacing of rollers. Replace bearing. Rotate shaft at least once every two weeks to prevent brinelling.

Problem: Vibration
Possible cause Solution
Foreign matter or corrosive agent entering bearing. Remove and inspect bearing. Clean and re-lubricate bearing and seals.
Pinching of bearing. Make sure the entire area of the pedestal base is supported.
Shaft undersize. Measure shaft size for correct fit. Refer to engineering section.
Unbalanced load. Re-balance machine.
Flat on roller due to skidding. Replace roller.
Improper mounting of bearing. Inspect bearing. Check that all match marks coincide. If parts are damaged, replace with new bearing.
Bearing cartridge not aligned. Remove pedestal cap and lubricate cartridge spherical with
anti-seize compound.
Excessive clearance in bearing resulting in vibration. Use bearing with recommended internal clearance.
Failure to clean bearing before assembly. Remove and carefully clean bearing and re-assemble with
correct lubrication.

Problem: Bearing loose on shaft
Possible cause Solution
Clamping rings not tightened sufficiently. Make sure clamping rings are fully tightened. Refer to assembly procedure.
Undersize shaft. Measure shaft size for proper fit. Refer to engineering section.
Shaft out of round or not parallel. Measure shaft size for proper fit. Refer to engineering section.


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Cooper Service Centers
USA and Mexico
The Cooper Split Roller Bearing Corp
5365 Robin Hood Road, Suite B
Norfolk, VA 23513
USA
Telephone 757 460 0925
Fax 757 464 3067
Canada
Cooper - Grainger Canada Inc
5875 Coopers Avenue
Mississauga
Ontario L4Z 1R9
Canada
Telephone 905 890 2266
Fax 905 890 2269
UK, Asia, Australasia and Middle East
Cooper Roller Bearings Co Ltd
Wisbech Road
King's Lynn
Norfolk PE30 5JX
England
Telephone +44 (0) 1553 763 447
Fax +44 (0) 1553 761 113
Europe and South America
Cooper Geteilte Rollenlager GmbH
Postfach 100 423
Oberbenrader Str 407
47704 Krefeld
Germany
Telephone +(49) 2151 713 016
Fax +(49) 2151 713 010
www.CooperBearings.com