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Hydraulic cylinder rebuild question

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Tim

04-01-2004 15:45:42

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I am rebuilding a dump cylinder from my Allis Chalmers HD-5.

It has a 2 part piston. V-ring in front part, bearing ring in back. The parts book shows the two parts tight together with a shim under the v-ring packing. (no instructions on how to set shims)

My question is how tight should I make the v-rings to the cylinder wall. I have new V-rings and no shim so I have to set it up from scratch! If I stack everything up finger tight I have about .125 gap between the two parts of the piston. When I slide the cylinder on, it rubs all around the cylinder wall but not tight.

I figure I'll tighen the the two parts until I'm satified with the fit then dis-assemble it and make a shim.

anybody ever rebuild one of these before??

How tight are new cylinders?

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Charlie

04-01-2004 18:18:04

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Re: Hydraulic cylinder rebuild question in reply to Tim, 04-01-2004 15:45:42

Someone else may comment with particular experience on that kind of cylinder. It sounds like a one way cylinder. Two points: in all the V ring sets I've replaced in cylinders, there have always been bearing rings or shims on both ends of the V set. These mesh with the V (either inside it or over it depending on which end, and are flat on the other side, so that the whole assembly is flat at both ends and can be tightened up reasonably. No need to crank down on anything to get an extra tight seal at all, it's the high pressure of the fluid that pushes out the edges of the V seals to give the actual sealing effect only when you need it. That's the principle of lip seals like V seals.

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Tim

04-01-2004 18:25:40

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Re: Re: Hydraulic cylinder rebuild question in reply to Charlie, 04-01-2004 18:18:04

Thanks for the input.
The stack has a male and female that fit into the v's so the top and bottom is flat.
Your info about the pressure causing the seal to "seal" Is helpful. I guess I'll make a shim so I can tighen the nut to hold the piston tight to the rod and keep the v's just snug to the cylinder wall.

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