hydrolic cylinder

Anonymous-0 · Dec 10, 2009

I just purchased a used disk with a remote hydrolic cylinder. when removed from the disk, the cylinder piston will extend and retract with the tractor hydrolics but when attached to the disk, it will not extend and pick up the disk. Any thoughts on what is wrong would be appreciated

Paul from MI · Dec 10, 2009

Could be several problems. Do the tractor hydraulics work properly with other implements and/or cylinders? If so the problem lies with this particular cylinder and disc. Is the something mechanically limiting the disc so it can't raise? If so the pressure relief valve on the hydraulics should be squealing when you try to raise the disc. If something is wrong inside the cylinder allowing the oil to bypass the piston under load the pressure relief valve will not open, so no noise. I would check for a mechanical issue, then try it with a known good cylinder. You don't say what size the cylinder is, but a small cylinder like a 2" may not have enough force to lift the disc. The same may be true if the disc was operated by an older Allis Chalmers tractor which had a very high pressure system using smaller cylinders. Just some thoughts,
Good luck,
Paul

paul · Dec 10, 2009

What tractor do you have, and how 'strong' are the hydraulics? Some were only 1200-1500 when new, and are much less than that now.

If you got an Allis disk, like mentioned, they used very high pressure, I think 3000 psi so the cylinders were much smaller, don't work with other tractors.

--->Paul

Anonymous-0 · Dec 10, 2009

thanks for the responses. I have tried 3 tractors 1 a 641 Ford 2 a 5000 Ford and 3 an alis 5045. they all work with other equipment.
cylinder is a 4 inch 8 inch extended. Disk works with a different cylinder. No noise from the releif valve. Cylinder will extend and retract when unhooked from disk. when hooked to disk it extendes two inches then nothing. How do I determine what is wrong with the cylinder?

gene bender · Dec 10, 2009

Your lift is determined by the diameter of the cycl the larger the dia the more force it will have. You must have a cycl with a too smal of a dia to go a good job of lifting. Mite need to put a guage on the inlet to see how much pressure your pump has.

Anonymous-0 · Dec 10, 2009

Sounds like you have an internal leak, o-rings on the piston, not as hard to fix as finding the parts.

old · Dec 10, 2009

You sort of answered your own question when you said it works with a different cylinder but not that one. That cylinder is going bad and leaks enough the with a load on it does not work but with no load seems to work but no load means little pressure to make go in and out but with a load takes lots pf pressure and with a lot of pressure the seals leak bad so by pass on you

armand tatro · Dec 10, 2009

if a cylinder has an internal leak you will not be able to see it. It will have to be taken apart and rebuilt. Best way to check it is if another 4in. by 8in. cyl. on your tractors will lift the disc. When I say use a different cyl. it needs to be a known good cyl. Armand

Anonymous-0 · Dec 10, 2009

Probably just need new seals in the cylinder. It's not a big costly job to replace them. If it's a standard type implement cylinder a seal kit will probably cost about $30 and take about 1/2 an hour to fix. If you do the internal seals, it's always a good idea to all of them at the same time. Dave

paul · Dec 10, 2009

There is a disk in the middle of the cyclinder, sorta like a plunger.

Pressure on one side or the other of this disk forces the cyclinder to move.

90% chance this disk or plunger is wore down and the oil is leaking past - instead of pushing on it. It will work with no load on it, but with any load on it, the oil just pushes past the plunger.

Many of these cylinders are rebuildable if you can do it yourself, but probably doesn't pay to pay anyone to do it for you for a regular common one. At auction today was a new never used cylinder went for $25, and at a fleet & farm supply store you can get them for about $65-100.

--->Paul

LenND · Dec 10, 2009

The disk doesn't have a lock holding it in one position does it?

Rusty wheel · Dec 10, 2009

How to test a hydraulic cylinder to see if the oil is bypassing the piston. First, extend the cylinder all the way. Then, disconnect the line going back to the tank at the extended end of the cylinder. Then, shift the valve to extend the cylinder some more and see if any oil comes out where the line is disconnected. If it does, the oil is bypassing. Then you can repeat this operation in the other direction and see if it bypasses in that direction. Some hydraulic pistons have "o" rings and some have cup seals in them, expecially if they are a double acting cylinder. Hope this helps.

hydrolic cylinder

Anonymous-0

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Paul from MI

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paul

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Anonymous-0

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gene bender

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Anonymous-0

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old

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armand tatro

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Anonymous-0

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paul

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LenND

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Rusty wheel

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