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Introduction

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.

Key Facts

  • Material handling and warehousing
  • Frequent bearing failure- 40 wheel hubs changes in 5 years
  • Failure causes significant production down time and additional cost
  • Poor lubriacation and particle ingress
  • Radial pre load problems
  • Expensive OEM parts
  • NSK Solution: pre-greased Sealed Double Row Angular Contact Bearings with C3 clearance
  • Productivity improvement & cost saving generated

Crane Wheel Hub Crane Wheel Hub
NSK Sealed Double Row Angular Contact Bearing NSK Sealed Double Row Angular Contact Bearing

Background Information

  • Industry: Material Handling
  • End-product: Boxed items
  • Application: Distribution Center crane application

  • Number of machines: 25
  • Approx. Life: 1 1/2 months
  • Problem: Ingress of contamination, poor lubrication and radial pre load

Value Proposals

  • NSK conducted an Application Review and a Bearing Failure Analysis showing poor lubrication along with radial pre load.
  • NSK engineering reviewed the original wheel design recommending the use of a pre-greased sealed NSK Angular Contact Bearing issuing modified wheel machining drawings and a fitting procedure for correct assembly

  • A trial was completed on 8 modified crane wheels utilizing pre loaded NSK Angular Contact Bearing with seals
  • Trial resulted in increased bearing life, reduction of maintenance costs and increase in productivity. 

Product Features

  • Seals RSR: made of nitrile rubber reinforced with an embedded steel disc
  • Contact seals provide excellent protection against the ingress of contamination, reducing wear on the raceways and ball surface which in turn reduces noise, vibration and risk of lubricant failure

  • Accommodate radial and axial forces in both directions

Cost Saving Breakdown

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
Total Costs $75,630 $13,556

Reference: SS-E-2051

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