Solving Gear Pump Cavi Mystery - No Priming Needed

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The discussion centers on a malfunctioning gear pump used for lubricating oil, which initially required priming to function, raising questions about its design and operation. The user experienced no flow from the pump despite checking rotation and temperature, and after priming, it worked temporarily before the electric motor burned out. Possible causes for the initial failure include increased clearance between gears leading to back leakage, which prevented the creation of necessary suction. The new, larger pump operated without priming, suggesting design differences or improved efficiency. Overall, the conversation highlights the complexities of gear pump operation and potential issues with motor performance.
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gear pump cavi ?

well dear all we know that gear pump is a positive desplacement pump which has constant dioscharge at different loads my problem is i need an explanation to this sitiuation

" from 1 month at my work i found a breakdown of lubricating pump used to pump oil on a bearing it was a gear pump
i found that there is no flow exiting out the pump i checked direction of rotation and pump tempreture i found nothin
a friend of mine PRIMED the pump and it has worked i found this strange because of the nature of gear pump
after 2 weeks we found that the electric motor of this pump is burned i don't know why ?
after this i changed the gear pump with a larger one which worked without any kind of priming
i don't know what's the different or the meaning of this sitiuation
pls guys help me ?
 
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strange things happen!

may be the clearance between gear and casing or between two gears, had increased causing back leakage...which might have not able to produce the initial vacuum for the suction...so might had need priming...and after priming...it could had discharged the liquid but with less efficiency due the back leakage...

and about your motor...it might had run freely...for some time...or might be overloaded...

a slight voltage fluctuation can do that...

all are possibilities as you had asked for the same..

n definitely your new pump will properly because "It is New!"

sorry...bad joke...but...there will be no casing clearance or gear clearance...
 


thanx for your answer i really appreciate this
 

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