Basic Maintenance Skills
Keep things clean
- Do not unpack new bearings until you're sure you're going to mount them.
- Do not open seals unless you really really have to.
- Clean your skin and clothes before opening bearings.
- Sanitize the work area as much as possible. At a minimum, lay bearings and tools on clean newspaper.
- Cover parts with clean newspaper when not working.
- Flush bearing parts with solvent before reassembly
- Keep clean. Bearing failure is almost always caused by contamination.
Be careful when pulling bearings
- Use proper equipment; something that only contacts the inner bearing race. Don't press against the balls/cages.
- Do not apply uneven pressure to bearing. That will twist it in its support. Push/pull tool must be cut square.
- Do not hammer on housing or shaft.
- Bearings should be round. Replace if any surface is pitted, nicked or flattened.
- Bearings should rotate freely. Replace if rotation catches or makes noise.
- When in doubt, replace. If in a critical position, replace at each overhaul.
- Surfaces that contact the bearing should be smooth. Check that shaft and shoulders are square with no burrs.
Inspect new bearings
- Compare bearing dimensions to requirements. EX: don't use a 5mm wide bearing when a 10mm width is called for.
- Check bearing construction against application. EX: don't use angular contact bearings to take a thrust load.
- Ensure bearing shields are as specified. EX: don't use water resistant shielding when water proof is necessary.
Carefully install bearings
- Spread some oil lightly over the inner surface of the bearing.
- Check bearing markings for proper orientation upon installation.
- Press firmly against shaft shoulder.
- Install accessories like snap rings properly, flat side against bearing.
- Lubricate according to manual