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77RC Hydraulics

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Jon

04-09-2000 19:44:55




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My tractor has one of those aftermarket 3-point hitches on it. It will raise the plow quite rapidly, but it doesn't remain up at all. It seems to be getting worse; it stayed up when I first got it. If I go the opposite way, and use down pressure, it will lift the tractor right off the ground-and hold it there. Where would I start looking, the lift cylinders, or the control unit? The cylinders are not both the same, if that makes a difference. One is a larger diameter than the other. The Oliver manual that I have talks about Hydra-lectric stuff; I don't have any of that, just two manual levers right on top of the reservior. Was this just done by someone later on, rather than trying to deal with all the wires and such?

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Scott Green

04-10-2000 03:39:47




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 Re: 77RC Hydraulics in reply to Jon, 04-09-2000 19:44:55  
One more thing Jon , if you have a piston cup , and there is only one of them , it won't matter how many times you rebuild the cylinder.You will always have some leakage in one direction.Switch your hydraulic lines around so that the plows stay up , instead of the tractor staying in the air due to good down preasure(NO Leak by).



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jld

04-10-2000 07:51:09




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 Re: Re: 77RC Hydraulics in reply to Scott Green, 04-10-2000 03:39:47  
Sure way to tell if a double acting cyl piston seal is leaking, disconnect the return line from the cylinder. There should be no fluid come from the hose.



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Scott Green

04-10-2000 03:32:11




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 Re: 77RC Hydraulics in reply to Jon, 04-09-2000 19:44:55  
Jon , you have a leak somewhere.The question is , Where?I would think that it was in the valve , or in the cylinder.I'm taking it , you don't see any external leakage.I would start with the cylinder.Take it apart and rebuild it.Replace seals , O-rings , piston cups , packings.I don't know how your cylinders are put togather , but it is a very easy job.Lets hope this does the trick.And that you don't have to find a cracked or scored control valve.I'm sure other people can add to this.

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