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Farmall & IHC Tractors Discussion Forum
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MW pump

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Chester5731

11-21-2006 07:33:10




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I have a 50 M with a M&W live pump. The pressure line splits into to valves, the one by the tank and one I added for a loader. Since it is an open center system I know I need to block one valve off to use the other but then there is a buzzing noise coming from the pump. There does not seem to be pressure on any of the hoses when I do this and everything works OK. What I am wondering is what might cause the buzzing noise and is it going to hurt anything?

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Chester5731

11-21-2006 11:39:05




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 Re: MW pump in reply to Chester5731, 11-21-2006 07:33:10  
Thanks for the info, I will check it out tonight.



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Wardner

11-21-2006 10:58:06




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 Re: MW pump in reply to Chester5731, 11-21-2006 07:33:10  
The noise is probably the sound of cavitation which is not good. It will destroy your pump molecule by molecule. Each high and low wave in the frequency that you hear is a vacuum being created followed by the rapiid collapse of that vacuum.

Ok, enough with the theory. Your pump is not getting enough oil. Check hoses, filter (if any), and breather in the reservoir. Do whatever it takes to get more oil to the inlet of the pump.

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Wardner

11-21-2006 11:08:25




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 Re: MW pump in reply to Wardner, 11-21-2006 10:58:06  
I forgot something but it is not related to the noise. Where the line splits, you can install what is called a selector valve. It will take one hydraulic circuit and provide ports for two circuits. It will have a knob attached to the spool that has two positions. Any hydraulic catalog will have them including Northern Hydraulics. eBay too at $10-$30. For more money, buy a regular open center two spool hydraulic valve. It will have three positions for each lever. They are more convenient to use.

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