Keep the evidence with the model shortlist
The models on this page illustrate bearing roles; they are not confirmed replacements for an unspecified machine. Keep the original complete marking, machine position, load and speed duty, temperature, lubricant and mounting arrangement together. Check the candidate's recorded values below and leave unreported parameters unknown.
Check drawings and model records · Investigate a failure before replacing it · Plan installation and force paths
What matters in this application
Mechanical interfaces
Record ring sections, hole pattern, gear module, tooth count, lubrication connections and seals.
Load combinations
Use radial, axial and overturning moments over the machine's operating envelope.
Support condition
Check mounting-surface flatness, structural stiffness and the specified bolt installation procedure.
Which bearing structures make sense?
Ball slewing rings
Evaluate only within the specified complete ring arrangement.
Check first: Capacity includes combined loading and mounting conditions, not just bore size.
Roller/crossed-roller slew designs
Use where specified by the equipment designer.
Check first: Similar envelope dimensions do not establish equivalent load capacity or gearing.
Model selection & data availability
Use the selection requirements below to identify the exact specification. A general-purpose bearing is not presented as a substitute for an unverified specialist design.
Search an existing designation →Work through the selection
- Identify the equipment serial number and original slew-bearing drawing.
- Confirm gearing, bolt pattern, lubrication and sealing interfaces.
- Review combined-load capacity and support stiffness with the approved design data.
- Use the equipment's lifting, bolt installation, inspection and commissioning procedure.
Symptoms worth checking
Axial play or uneven resistance
Measure through the manufacturer's wear-check method and inspect support bolts.
Damaged seals or grease contamination
Investigate seals and purge paths; replacing a seal does not remove internal damage.
Symptoms are investigation prompts, not a diagnosis. Isolate equipment safely and follow its maintenance procedures before inspection.
Have the original designation?
Look up the complete model and suffix before comparing potential alternatives.
Application questions, answered
Can I select a swing bearing by outer diameter?
No. Gear and bolt interfaces, load combinations, clearances and support structure are equally important.
Is a robot crossed-roller bearing an excavator slew-ring replacement?
No. The applications and complete structures differ. This site does not claim an equipment-approved substitute.
Reference basis & recommendation limits
- NSK — Quarrying, Mining and Construction
Application principles are informed by the listed technical references. Model shortlists are BearingScope editorial selections from its database, not manufacturer endorsements or equipment-fit approvals. Confirm the latest exact specification and the complete equipment design before use.