News

  • Operation Inspection

  •  After the mounting has been completed, a running test should be conducted to determine if the bearing has been mounted correctly. Small machines may be manually operated to assure that they rotate smoothly. Items to be checked include sticking due to foreign matter, visible flaws,  uneven torque caused by improper mounting or an improper mounting surface and excessive  torque caused by an inadequate clearance, mounting error, or seal friction. If there are no abnormalities, powered operation may be started.
     
    Large machines, which cannot be turned by hand, can be started after examination with no load, and the power immediately cutoff and the machine allowed to coast to a stop. Confirm that there is no abnormality such as vibration, noise, contact of rotating parts, etc. Powered operation should be started slowly without load and the operation should be observed carefully until it is determined that no abnormalities exist, then gradually increase the speed, load, etc. to their normal levels. Items to be checked during the test operation include the existence of abnormal noise, excessive rise of bearing temperature, leakage and contamination of lubricants, etc. If any abnormality is found during the test operation, it must be stopped immediately and the machine should be inspected. If necessary, the bearing should be dismounted for examination.

     

    Irregularities

    Possible Causes

    Countermeasures

    Noise

     

     

     

     

     

    Loud

    Metallic

    Sound 

    Abnormal Load

     


    Incorrect
     mounting

     


     

    Insufficient or improper 
    Lubricant

     

    Contact of rotating parts

    Improve the fit, internal clearance, 
    preload, position of housing shoulder, etc.


    Improve the machining accuracy and 

    alignment of shaft and housing, accuracy 

    of mounting method.


    Replenish
     the lubricant or select another
     lubricant. 


    Modify
     the labyrinth seal, etc.

    Loud 

    Regular

    Sound

    Flaws,corrosion,or scratches 
    on raceways

     

    Brinelling

     

    Flaking on raceway

    Replace or clean the bearing, improve the 
    seals, and use clean lubricant.


    Replace the bearing and use care when 
    handling bearings. 

    Replace the bearing.

    Irregular

    Sound

    Excessive clearance

    Penetration of foreign particles


    Flaws
     or flaking on balls

    Improve the fit, clearance and preload.

    Replace or clean the bearing, improve 
    the seals, and use clean lubricant.

    Replace the bearing.

    Abnormal

    Temperature

    Rise

    Excessive amount of lubricant 

    Insufficient 

    or improper lubricant 

    Abnormal load

     

    Incorrect mounting


     

    Creep on fitted surface, excessive

     seal friction

    Reduce amount of lubricant, select stiffer grease. 
    Replenish lubricant or select a better one.


    Improve
     the fit, internal clearance, preload, 
    position of housing shoulder.


    Improve the machining accuracy and 
    alignment of shaft and housing, 
    accuracy of mounting, or mounting method.


    Correct
     the seals, replace the bearing, 
    correct the fitting or mounting.

    Vibration

    (Axial 

    runout)

    Brinelling



    Flaking



    Incorrect
     mounting


     Penetration of foreign particles

    Replace the bearing and use care when 
    handling bearings. 


    Replace
     the bearing.

     

    Correct the squareness between the shaft 

    and housing shoulder or side of spacer.


    Replace
     or clean the bearing, improve the seals.

    Leakage or 

    Discoloration 

    of Lubricant

    Too much lubricant, Penetration 
    by foreign matter or abrasion chips

    Reduce the amount of lubricant, select a 

    stiffer grease. Replace the bearing or 

    lubricant. Clean the housing and 

    adjacent parts.

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