Hydraulic pump chatter when loader is off 
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 05-11-1999, 00:00 Post: 3692
Gene Zierdt



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 Hydraulic pump chatter when loader is off

I have recently purchased a JD 650 with a Bush Hog loader and 3-point mower. Last week I wanted to make mowing easier (read: don't hit any more trees with the bucket on the loader). Removing the loader was easy, but when I restarted the tractor, I could hear a high-pitched whine from the hydraulic pump. The loader hydraulics were attached with quick-disconnect fittings on three separate hoses that go into the hydraulic pump area under the seat, so there is no manifold. One of the hoses has a female fitting, and the other two are male. I hooked up one of the male to the female fitting, and the whine disappeared. I'm guessing that hooking up the hoses directly to the pump outlets in this fashion does not put a relief valve in the system, and the whine was the pump working against itself. Is this correct? Should I continue to hook the male and female hoses together when the loader is off? Thanks in advance for any advice.






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 05-12-1999, 00:00 Post: 3720
len



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 Hydraulic pump chatter when loader is off

It sounds like the tractor has a open center hydraulics without a bypass when the loader is diconnected.. By hooking the hoses together you created the bypass,






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