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Hydraulic cylinder

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mm

07-11-2001 05:43:52




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I own a red lion hydraulic cylinder wth working pressure at 2500 lbs. I have 1 way hydraulics on my tractor. I was unable to get the rod out therefore i brought a breather. Buy the way which end does it go on? I took the cylinder off the implement and got the rod to extend out but it will not go back to the home position even after disconnecting the hoses therefore I removed the cylinder and took it apart and could only get the rod down by taping it with a hammer is this normal? Should I be able to move the rod by hand? Should the breather go on the end with the piston nut end in the home position. What happens if I lossen the nut? How can I tell if the o'rings are bad? Thank You in advance for your reply. Is the cylinder any good?

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rhudson

07-11-2001 19:18:58




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 Re: hydraulic cylinder in reply to mm, 07-11-2001 05:43:52  
Hi MM, i think you have a double acting cylinder, in other words it has fittings for two hoses. one at the rod end, other at piston end. since you are using single acting hydraulic line, you will need the breather at one end or the other as you have already guessed. if you want to extend the cylinder(rod pushing out, this is the most used method on implements) put the breather at the rod end and hose at piston end. the weight of the implement is the only thing that will return the rod.(hydraulic power extend, gravity to return the rod) most DA cylinders will have a wiper and oil seal on the rod end and two oil seals on the piston. thats a lot of friction so its normal and even diserable for it to be hard to manually move the piston back and forth. if it were easy i would suspect badly worn seals. orings should be flexable, no cracks, no flat spots, no cuts or abrasions. kits to rebuild red lions are available, try Tractor supply if you can find anyone working there that knows their stuff (good luck) or baum hydraulics, kit should be under $20.00. with breather in rod end and hydraulic hose in piston end, full extend cylinder and hold valve in extend position for a few seconds, if you see oil seeping out of breather, thats an internal seal leak. red lion is a pretty good cheap cylinder. oh if you do take piston nut off, their is usually an o ring between the piston and rod that should be replaced. this prevents oil from seeping between the piston and rod. hope i have not added to any confusion. email me if you like. i'll try to confuse you even more.

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