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Hydraulic system cavitation
:

purpose of aux reservoir?

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Charlie

06-13-2000 16:00:16




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I posted a question a couple of weeks ago about noise I was getting from the hydraulic pump on a closed center system when the steering wheel starts to move. Dan King did a good job of explaining how my pump is starved for fluid (cavitation) going from no flow to full flow which is causing the noise. My question now is should the auxiliary reservoir above the pump be instantly supply this needed fluid? Is that's its purpose? Thanks for the help.

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Dan King

06-13-2000 23:03:11




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 Re: Hydraulic system cavitation - purpose of aux reservoir? in reply to Charlie, 06-13-2000 16:00:16  
Don brought up a good point! Could be the sound is mechanical in origin. As to the aux reservoir. It's purpose is just as you described. The location above the pump is to provide positive flow (Head) to the inlet of the pump. The limiting factor is the diameter (flow capacity) of the inlet piping. In a hydrostatic system (Closed Loop) the purpose of the charge pump is to provide a sufficent flow to the pump inlet to prohibit cavitation. Good old gravity just doesn't get the job done but its allot better than nothing.

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Don

06-13-2000 17:22:29




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 Re: Hydraulic system cavitation - purpose of aux reservoir? in reply to Charlie, 06-13-2000 16:00:16  
Sounds to me that what you are hearing is the pump coupler thats worn out . Take it apart and look at the rubber bushings and coupler halves.When you put a load on the pump it stops the noise momentarly.Also check the cast iron shaft as these can come loose and rattle for awhile before they strip out Hope this helps.



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