FAQs

• Q What material we can use for slewing ring bearing?

  The material used in our most slewing ring bearings is 50Mn&42CrMO,42CrMo is better than 50M due to it has high strength and toughness, and good hardenability.

  42CrMo=America ASTM 4140/4142 =England BS 708M40/708A42/709M40 =Fance NF40CD4/42CD4 =GERMAN DIN 41CrMo4/42CrMo4=JANPAN JIS SCM4=ISO 683/1 3

  50Mn=America ASTM 1050/1052 =England BS030A52/080M50=France  NF XC48 = Japan JIS S53C

  
  

• Q Can I get a model selection and price quote if I only have the equipment model number and no technical drawings?

  Yes. Simply provide the equipment brand and the complete machine model number, and we will match the appropriate specifications based on the original manufacturer's parameters. Alternatively, if you can provide photos with dimensions—or details such as outer diameter, inner diameter, height, and gear specifications—we can quickly calculate load requirements, identify the correct model, and issue a quote without needing formal drawings.

  
  

• Q Is the gear hardening treatment overall quenching or single quenching?

  we have 2 machines, one can do overall quenching, the other is single quenching.

  
  

• Q Why there is noise from the raceway when the slew ring bearing working?

  As our experience, the reason is the raceway quenching has some problem, like hardness is not enough, the quenching depth is not qualified, no enough grease .etc.

  
  

• Q What types of slewing bearings can you manufacture?

  Our factory produces a comprehensive range of slewing bearings, including four-point contact ball, double-row ball (different diameters), three-row roller, crossed roller, and lightweight/thin-section types. We offer gearless, internal gear, and external gear configurations, suitable for a wide array of applications such as excavators, cranes, tower cranes, aerial work platforms, wind power systems, solar trackers, construction machinery, marine radar, and automation equipment.

  
  

• Q Can you measure the old sample and make the same drawing as original?

  we often measure the old sample and produce new one for our customers.

  
  

• Q What is the warranty period for the slewing bearing, and how are quality issues handled?

  All brand-new, factory-original products come with a standard 12-month warranty. We provide free replacements or repairs for quality issues—such as body cracking, raceway detachment, or gear machining defects—provided they were not caused by improper installation or misuse. Lifetime support, including spare parts, repairs, and technical guidance, is available beyond the warranty period.

  
  

• Q Can I get quotation with only machine model?

  Sure, offer equipment model or dimension data for quick quote.