hyd cylinder rebuild - is it worth it?

Dan in North Houston · Aug 28, 2016

I picked up an old bat wing shredder, and the lift cylinder leaks. Upon closer inspection, I see that one of the four bolts on the end is broken off. So I figure that no wonder it leaks, with only 3 of the four bolts holding the end on. It is 3" bore and 10" stroke.
But this cylinder has been used with aluminum stop collars around the rod, so that the rod has not been completely retracted in years. There has been water with the hydraulic oil lying in the cylinder bore, and it has rusted in the section of the bore where the rod has not been fully retracted. Seals are pretty ratty also, but that is an easy fix. If I am able to get the broken bolt out, that still leaves me with the problem of the bore. The surface is pitted, not just a thin layer of rust. I could use a cylinder hone or ball hone on it, but the surface is not going to be very smooth unless I remove a lot of metal. Then I'm gong to have a bore that is not uniform unless I do the whole bore. Of course, I could send it to a machine shop, but that's not very cost effective. I wouldn't mind a challenging project, but I am afraid that this could be a technical success and economic failure. What do you all think?

cool hand · Aug 28, 2016

Dan, replace the cylinder with a new one and scrap the old one. They are not terribly expensive.

Steve@Advance · Aug 28, 2016

Getting the broken bolt out won't be a problem, but if it was leaking externally, depending on how it is constructed, there could be some warpage from the stress of the missing bolt.

If the bore is badly pitted, nothing even a machine shop could do, or nothing I know of that would be economically feasible.

JD Seller · Aug 28, 2016

The cost to replace that cylinder would be less than fixing it if the ram and bore are damaged. If the bore and ram are not pitted too bad then a kit to rebuild them is not that much. Usually around $15 or so.

Also are you really sure that it is a 10 inch stroke cylinder??? Eight inch stroke are much more common.

alg · Aug 29, 2016

surplus center .com

Angle Iron · Aug 29, 2016

(quoted from post at 19:40:44 08/28/16) I picked up an old bat wing shredder, and the lift cylinder leaks. Upon closer inspection, I see that one of the four bolts on the end is broken off. So I figure that no wonder it leaks, with only 3 of the four bolts holding the end on. It is 3" bore and 10" stroke.
But this cylinder has been used with aluminum stop collars around the rod, so that the rod has not been completely retracted in years. There has been water with the hydraulic oil lying in the cylinder bore, and it has rusted in the section of the bore where the rod has not been fully retracted. Seals are pretty ratty also, but that is an easy fix. If I am able to get the broken bolt out, that still leaves me with the problem of the bore. The surface is pitted, not just a thin layer of rust. I could use a cylinder hone or ball hone on it, but the surface is not going to be very smooth unless I remove a lot of metal. Then I'm gong to have a bore that is not uniform unless I do the whole bore. Of course, I could send it to a machine shop, but that's not very cost effective. I wouldn't mind a challenging project, but I am afraid that this could be a technical success and economic failure. What do you all think?

f it worked with the stop collars in place in the past why worry about the pitting as it is not in the needed travel area on this shredder. If the travel was far enough before it still will work. If that's the case clean it as best you can and use it on the shredder only.

Kent Petersen · Aug 30, 2016

The kit for that cyl will cost a lot more then $15.00. i just put new piston oring and backing washers in a 2.5 in JD cyl and they cost $24.00 at the dealer. it was a black cyl ie high psi like yours

hyd cylinder rebuild - is it worth it?

Dan in North Houston

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cool hand

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Steve@Advance

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JD Seller

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alg

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Angle Iron

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Kent Petersen

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