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Hydraulic Cylinder Leaking

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1PWRFULH

06-12-2001 17:51:29




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Anybody here know anything about hydraulic cylinders? I put my loader on the H and the cylinders worked fine but then 2 days later the left cylinder started pouring oil out of the place where a return line would hook. Only did this at a certain height and above. Took the thing apart tonight and everything looks fine to what I can tell. I did see some dirt up in the cylinder tube and thought that could be holding the seal up when the cylinder gets to the dirt, causing oil to leak around it? These cylinders havn't been used in years. Oil does not leak around the top of the cylinder and get on the shaft. It only comes out of the return. What gets me though is that it does not leak out of there until you get to about the height of the tractor then it POURS out? I gotta get this bad boy going! Also, do I NEED a return line?? Seems like it comes down fast enough? Well thanx in advance...any help is appreciated!

RC

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KURT

06-13-2001 03:08:58




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 Re: Hydraulic Cylinder Leaking in reply to 1PWRFULH, 06-12-2001 17:51:29  
Yes I agree with Zonie. See that blade set up he made. Looks awesome, too bad it is not a double acting cylinder. the down pressure on the piston on a 3 inch bor cylinder would be able to lift the a** end of the tractor off the ground.



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Zonie

06-12-2001 19:01:13




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 Re: Hydraulic Cylinder Leaking in reply to 1PWRFULH, 06-12-2001 17:51:29  
It does sound as if the piston seal is leaking, the oil won't come out until the piston is pushing it out. If you have dirt in the cylinder it WILL destroy the sealing ring, more likely you have rust in there which is worse. I'd take the cylinder apart and get all new seals, orings and such. Take a cylinder hone to remove the dirt/rust you'll probably need to extend the hone's shaft somehow. Only hone lightly, you don't want to remove anymore than necessary and thoroughly clean all parts. You shouldn't need any return line as the H's hydraulics use only one hoseas supply and return. The port you refer to as the return port should have a vent plug installed this will keep out the dirt and moisture and allow the air to go in and out as necessary, and make sure the vent hole isn't pointing at you while sitting on the tractor,don't ask how I found this out.
I just went thru all this with my H recently, with a cylinder bought at a scrap yard.
you should be able to get the seals from a local hydraulics repair/supply outfit. they should be relativly inexpensive ( mine cost about $10.00 for every seal in 1 cylinder !)and now it doesn't squirt oil all over the neibors car anymore! this can be embarassing!

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Zonie

06-12-2001 18:38:37




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 Re: Hydraulic Cylinder Leaking in reply to 1PWRFULH, 06-12-2001 17:51:29  
It does sound as if the piston seal is leaking, the oil won't come out until the piston is pushing it out. If you have dirt in the cylinder it WILL destroy the sealing ring, more likely you have rust in there which is worse. I'd take the cylinder apart and get all new seals, orings and such. Take a cylinder hone to remove the dirt/rust you'll probably need to extend the hone's shaft somehow. Only hone lightly, you don't want to remove anymore than necessary and thoroughly clean all parts. You shouldn't need any return line as the H's hydraulics use only one hoseas supply and return. The port you refer to as the return port should have a vent plug installed this will keep out the dirt and moisture and allow the air to go in and out as necessary, and make sure the vent hole isn't pointing at you while sitting on the tractor,don't ask how I found this out.
I just went thru all this with my H recently, with a cylinder bought at a scrap yard.
you should be able to get the seals from a local hydraulics repair/supply outfit. they should be relativly inexpensive ( mine cost about $10.00 for every seal in 1 cylinder !)and now it doesn't squirt oil all over the neibors car anymore! this can be embarassing!

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