A distribution centers automated crane was experiencing regular wheel bearing failures due to loss of grease. The customer had to change 40 wheel hub units over a 5 year period. NSK conducted a bearing failure analysis confirming that the wheel bearings were suffering insigificant lubrication along with radial pre load. To overcome this, NSK recommended the use of pre-greased NSK Sealed Double Row Angular Contact Bearings with an increased radial internal clearance of C3. An 8 wheel trial was completed. No bearing failures were reported over 12 months. The sealed solution increased productivity and reduced maintenance costs resulting in a significant cost saving.
|Before||Cost p.a.||NSK Solution||Cost p.a.|
|OEM parts replacing 40 wheel hubs over 5 years||$28,682||Replacement of 8 crane wheel hubs over 5 years||$6,402|
|Loss of crane production||$32,010||Loss in production: no crane wheel failures||$0|
|Labour costs: Maintenance time||€10.000||Labour costs: Maintenance time||€2.000|
|NSK Engineering Analysis||$4,268||Wheel hub modification, bearings plus cost of machining||$5,020|
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