Material in cycle load role, even though the stress less than the yield strength often also happen fracture, this phenomenon is called fatigue fracture. Bearing fatigue fracture, especially high strength import bearing material fatigue fracture, before breaking generally have no obvious plastic deformation, difficult to detection and prevention, so there's large risk.

(1) the new put into use water pump, general in 100 operating hours must be replaced grease (oil), then every 500 operating hours one times change.

(2)the vessel with lubricating oil or grease to clean ，at ordinary times should be sealed good, should not have dust, oxide and sundry, lest damage bearing.

(3)adopt lubrication grease flow bearing, after operating 1500 hours the grease should be replaced, the amount of oil filling not too much or too little, because too much or too little grease can cause bearing heating, general master in the bearing capacity 1/2 to 2/3 advisable.

(4) motor bearing general use the sodium , the grease characteristic is the ability of high temperature (125 ℃), but easy to dissolve in water, so I can't put it to water pump bearing lubrication.
(5) for the lubricating oil bearing, the amount of oil should be added to the provisions position.
 



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