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Hyd lift arms don't stay up ....

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Alan

07-03-1999 20:10:36




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In position control , I hooked about 400 ponds up to my hydraulic lift and noticed that the arms drifted down and then bounced back up to where they should be . This happened continuously . I also turned the tractor off and the lift drifted down fairly quickly . I did not notice this with a lighter load of about 200 pounds . I did not have time to take the inspection cover off to look , but I am afraid that oil is leaking out of the cylinder under the heavier load . I have looked in the archives but did not see anything on this . Any opinion's greatly appretiated .
Thanks
Alan

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ZANE

07-04-1999 04:02:07




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 Re: Hyd lift arms don't stay up .... in reply to Alan, 07-03-1999 20:10:36  
You should first take off the right hand inspection plate under the seat on the side of the lift housing.With an implement on the lift start the engine and with the lift in the up position look inside and see if their is oil leaking from the end of the lift ram cylinder.If their is only a slight drip this is normal.If their is a fairly steady stream this may be the trouble.If the oil is coming from somewhere else try to pin point its orign. If you find no appreciable leaks on top in your view then you may have a pressure relief valve leaking. It is located just under the pto shaft on the vertical back of the pump.Sorta shaped like a spark plug and an 11/16" box end wrench fits it.You can check it by washing it up and then soaping it real good with some dishwashing detergent and water and apply air to the end that goes into the pump. If it is leaking you should replace it with a new one. The part # used to be 8N638. Hope this will give you some starting places. Zane in Al.

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Robert

07-03-1999 21:02:25




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 Re: Hyd lift arms don't stay up .... in reply to Alan, 07-03-1999 20:10:36  
Several years ago my 8n was acting similar. I put up with it until finally the pump quit due to sludge build up. While I had the top off, I took the piston out of the cylinder. I found the cyl walls were scored pretty deep. I'm not sure if this is a common 8n problm or not. I honed the cyl as best I could (No way to get it all out) and went back with a piston that used an o-ring type seal. This piston came from the Ford tractor dealer. Their suggestion was that the o-ring would wear to conform to the scored cyl wall. They also offered to sell me a new cyl but I thought I would give this a try. So far it has worked pretty good. Still leaks down some when the pump isn't turning but not enough to worry about.

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