Viscosity Guide - Table Of Limits

Maximum Viscosity at start up (centistokes)

22,000             Approximate maximum pouring viscosity

11,000             Probable maximum for splash or bath lubrication

  8,600             Barely pumpable by gear or piston pump—too heavy for service

  2,200             Upper limit for an automatic oil lubricator

  2,200             Upper limit for circulating system

  2,200             Upper limit for an oil constituent of a grease for dispensing

  1,000             Ring or rolling element bearings

     860             Fuel oil for good pumpability and atomizing for burning

     220             Oil mist generators without heat at minimum operating temperature

     220             Hydraulic-piston pump—start-up temperature—to prevent wear

      54              Hydraulic systems at operating fluid temperature

 

Minimum Viscosity at operating temperature (centistokes)

     33               Gear lubrication

     30               Gear pump

     21               Spherical roller bearings

     13               Other rolling element bearings

     13               Hydraulic systems to prevent excessive pump wear and slippage

     13               Plain bearings

      4                Minimum viscosity to support a dynamic load

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