PROBLEM

CAUSE

REMEDY

Noise

High pitched
metallic noise

Poor lubrication
Clearance too small
Poor fitting
Excessive load

Improve lubrication
Correct clearance
Investigate mounting method and seating
Examine shaft and housing tolerances for closing effect

Low pitched
metallic noise

Brindled raceway surface

Avoid shock loads

Regular noise

Rust and damage
Flaking of raceway surface

Check and replace seals and re-lubricate
Improve lubrication and check fitting, clearance and fixing method

Irregular noise

Ingress of foreign matter
Excessive clearance
Damage and flaking of rolling element

Check and replace seals and re-lubricate
Correct clearance
Reduce loads and/or clearance

Variable noise

Variable clearance due to temperature changes
Damage to raceways

Check fits taking housing material and temperature into consideration
Improve lubrication and check fitting, clearance and fixing method

Heavy vibration

Flaking of raceway and rolling element
Ingress of foreign matter
Excessive clearance
Poor location

Improve lubrication and check fitting, clearance and fixing method
Check and replace seals and re-lubricate
Correct clearance
Ensure abutment face and fitting diameter are perpendicular

Excessive heat generation

Clearance too small
Poor location
Excessive load
Poor lubrication
Creep

Correct clearance
Ensure abutment face and fitting diameter are perpendicular
Examine shaft and housing tolerances for closing effect
Improver lubrication
Maintain recommended shaft and housing fits

Lubrication failure

Too much grease
Ingress of foreign matter

Use correct lubricant quantity
Check and replace seals and re-lubricate