If the bearing malfunctions, how do you troubleshoot it? ZWA helps you solve the problem.

Shaft oversize. Bearing running tight

Provide shaft with correct tolerance.

Auminum 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 ZWA 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 bearing is mounted properly with rollers positioned centrally on the outer race.

Incorrect shaft alignment

Recheck alignment.

Bearing selected with inadequate internal clearance for high temperature operation.

Contact ZWA technical department.

Oil lubrication hole blocked. Grease passage blocked.

Inspect and clean holes. Refill to proper level.

Two fixed bearings on common shaft.

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 a few revolutions while under load. Re-tighten cap bolts.

Foreign matter or corrosive agent entering bearing.

Remove and inspect bearing and seals.

Clean and re-lubricate bearing and seals.

Pinching of bearing.

Make sure entire area of pedestal base is supported.

Undersize shaft

Measure shaft for proper fit.

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 centrally on the outer race.

Improper mounting of bearing

Inspect bearing, check that all match marks coincide. If parts are damaged, replace with new bearing.

Aluminum tripe 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.

Contact ZWA technical department.

Bearing selected with incorrect internal clearance.

Contact ZWA technical department.

Shaft does not contain a fixed bearing.

Remove one expansion bearing 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.

Clamping rings not tightened sufficiently.

Make sure clamping rings are fully tightened.

Refer to assembly procedure

Undersize shaft.

Measure shaft for proper fit.

Shaft out of round or not parallel.

Measure shaft.

Foreign matter or corrosive agent entering bearing.

Remove and inspect bearing and seals.

Clean and re-lubricate bearing and seals.

Pinching of bearing.

Make sure the entire area of the pedestal base is supported.

Shaft undersize

Make sure shaft for proper fit.

Unbalanced load.

Re-balance machine.

Flat on roller due to skidding.

Replace bearing.Consult ZWA technical department if problem persists.

Improper mounting of bearing.

Inspect bearing. Check that all match marks coincide. If parts are damaged, replace with new bearing.

Bearing cartridge not aligned.

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

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.