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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Rebuilding Cylinders

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John ni MO

05-12-2004 08:26:15




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I have tried everthing I can think of to get the caps off of my cylinders on my John Deere 310A Backhoe/Loader. I sprayed penatrating oil on the caps, made a hook spanner and just wore it out. and they still don't budge.... yes I loosed the set screw for the cap. Help!!! I need to replace the seals in my boom cylinders

Thanks
John




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Charlie

05-13-2004 06:42:57




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 Re: Rebuilding Cylinders in reply to John ni MO, 05-12-2004 08:26:15  
On my 3 inch crowd cylinder I thought the damn thing was never going to turn. Even with the tapping (which really does work, even though I never think it will), I had to use a 3 foot pipe wrench and then jump with my full weight on an 8 ft pipe over the handle. I almost fainted when it budged. A bit chain wrench can prevent the galling. Keep the cylinder mounted if possible when you do this so you don't need to rig up a second thing to keep it from turning.

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DAN

05-12-2004 20:01:57




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 Re: Rebuilding Cylinders in reply to John ni MO, 05-12-2004 08:26:15  
Big pipe wrenches and cheater pipes are usually what is necessary. But have you ever tapped a jar lid to loosen it? It works very well on hydraulic cylinders too, use a medium hammer and hit it many times with care not to hurt anything. The shock will loosen it, also it will help keep the threads from galling. If it seams tight after it turns, stop and tap some more. Brute force can ruin the threads. Be patient keep tapping it and good luck.

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carm

05-31-2004 06:32:09




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 Re: Re: Rebuilding Cylinders in reply to DAN, 05-12-2004 20:01:57  
How do you get the end cap off the cylinder? I can turn it but it doesn't come out. The end looks like a brass ring with two square cut outs opposite each other. I used a punch and hammer to turn it but it doesn't screw out.



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John in MO

05-13-2004 05:26:47




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 Re: Re: Rebuilding Cylinders in reply to DAN, 05-12-2004 20:01:57  
Hi Dan

I have done the tapping ordeal in the oil field to loosen large threaded parts. The cap on the JD cylinder have a very small area to grab on to from 1/4" to 3/8" wide will a pipe wrench work on that? I have also welded nuts onto things to remove them. Don't know if the heat loosed them up or just gave me more power...

A tapping we will go...

Thanks
John



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Alex

05-12-2004 14:22:14




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 Re: Rebuilding Cylinders in reply to John ni MO, 05-12-2004 08:26:15  
John

On my Case swing cylinder I had to put the cylinder in a vice and use a 4 foot pipe wrench to unscrew the cap. It did goudge it up a little but it was the only way of breaking it free. I aslo heated up the cylinder to help expand it a little while avoiding the cap.

Alex



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John in MO

05-12-2004 14:49:26




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 Re: Re: Rebuilding Cylinders in reply to Alex, 05-12-2004 14:22:14  
wow a 4' pipe wrench... once you moved it did it move alot easier?

Thanks
John



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marlowe

05-12-2004 17:02:14




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 Re: Re: Re: Rebuilding Cylinders in reply to John in MO, 05-12-2004 14:49:26  
on my case 450 i used a 4 ft. pipe wrench and a three foot pipe on that and pulled like he11.



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John in MO

05-13-2004 05:22:47




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 Re: Re: Re: Re: Rebuilding Cylinders in reply to marlowe, 05-12-2004 17:02:14  
Did you use any heat or impact on the cap?

Thanks
John



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Alex

05-14-2004 12:09:45




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 Re: Re: Re: Re: Re: Rebuilding Cylinders in reply to John in MO, 05-13-2004 05:22:47  
The cap has about a 1/4" to 5/16" lip on the outside to get a bite on. A friend owns a sprinkler business with the tools I needed. Once it turned it did get easier but once the o-ring that seals the threads was free of the cylinder itself I could easily spin it by hand. I did use a torch but not sure if I needed to.



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