Re: Hydraulic Piston Question

Posted by Mark on February 13, 2004 at 08:28:50 from (199.46.199.233):

In Reply to: Hydraulic Piston Question posted by scotty on February 12, 2004 at 11:26:22:

scotty,

I bought an antique combine one time that must have had 20 hydraulic cylinders and seems like there were 4 or 5 different ways to get at them. I had never done hydraulics before but by the time I had them rebuilt I was pretty good.

Repair is not that hard and if you have a reasonable mechanical aptitude you should do fine. If your local IH house can't get seals for you, you should be able to go to a hydraulics parts jobber and get them just by presenting yours to them.

Agreeing with info in other posts, there are 2 sealing mechanisms: 1 seals the innards from the outtards, and 2 seals the piston that does the work.

With a nut on the end, you should be able to back it off and unscrew it. once you pull the nut out there should be a (outter seal) on the bottom of it. With the nut off, you should be able to plush the movable shaft (containing the piston) toward the open end of the cylinder and the piston will come right out. There should be a screw or another nut holding the packing of the piston and it should be right there in your face. Depending on the type unit (mfgr's choice) something unscrews so that the piston and shaft can be removed from a cylinder. Be sure to pay particular attention to the "packing" as there is sealing packing and then there is pressure back -up packing and you need to insure that the pressure back-up is on the right side of the seal or the first time you power her up you'll blow your seal.

Common sense goes a long way on this job and you can do the job for around $35. Might as well do the other side while you're at it. If this side needed it, won't be long before the other will too.

Good Luck,

Mark

PS. On really large cylinders (like on a 100 hp sized front end loader lift cylinders) I had to use a come-a-long to push the piston/shaft back in....and be sure to soak the packing in hydraulic fluid prior to installation. Want things as slippery as you can get them....and don't forget to "vent" the other end of the cylinder when trying to push a piston back in....it's a bear if you don't.

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