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Breaking gland lose from cylinders

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Pat

03-26-2003 14:07:35




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Hi all,

I am in the process of repacking all the cylinders on my 450. Three of them broke apart with no problems. I have 2 that I cannot break lose. I have the case spanner tool and I have pinned the cylinders to the machine when trying to disassemble them. The retainer screws are removed. I used a 6 foot pipe on my breaker bar but the spanner falls out, slips out I should say, before the gland breaks lose. I am about to use some heat. Anybody had this situation? What should be heated or should I stay away from the heat?

Any help is appreciated.

Pat

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Max

03-26-2003 19:12:28




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 Re: Breaking gland lose from cylinders in reply to Pat, 03-26-2003 14:07:35  
What I used to do was to weld a 'fork' to the gland, then just mearly tap off with a sledge hammer. Worked every time then I would grind off the welds, clean up the gland and add new holes if needed, repaint, repack, and reinstall. If you use a pipe wrench it tears up the gland and most of the time you can't reuse it.



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Tom

03-26-2003 16:18:35




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 Re: Breaking gland lose from cylinders in reply to Pat, 03-26-2003 14:07:35  
I have gone through this before on an older Case Backhoe. You need a very big pipe wrench, like 36" or more, borrow or rent one. And a cutting torch that can make alot of heat real fast.
The cylinders seize on the nut and if you heat the area around the nut and down about an inch, give it a couple good wacks with a hammer then have the wrench in the ready position with a solid helper on the end of a pipe it should go. Crude but effective, we tried evrything else with failure. This is all assuming that your packing nut screws down into the cylinder like mine. This machine has had 3 years hard work since with no problem.

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Jeff

04-01-2003 18:21:56




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 Re: Re: Breaking gland lose from cylinders in reply to Tom, 03-26-2003 16:18:35  

I use a cast iron pipe cutter and its the best way and never fails ,this tool is used to cut(snap) large dia cast iron drain pipe its basicly a hand held plumbers pipe vise,kind of like a giant oil filter wrench but it has chain instead of a steel band .good luck Jeff



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Pat

03-26-2003 17:06:57




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 Re: Re: Breaking gland lose from cylinders in reply to Tom, 03-26-2003 16:18:35  
Thanks Tom. I'll give it a try. How hot did you have to get the cylinder case? I have been told to be careful heating the case so that the tube does no distort.

Do you know if the cylinders have to be dressed with a hone before repacking.

I only want to do this once!

Thanks again Pat



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Tom

03-27-2003 16:41:28




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 Re: Re: Re: Breaking gland lose from cylinders in reply to Pat, 03-26-2003 17:06:57  
I am not sure what Max means by tearing up the gland, we did serveral of these and had no problem. I suppose it depends on how bad it's stuck, even after all this they were very tight. I can't explain why they seize on so bad because once you get them off they all look clean and fine. I heated them to red all around as much as possible and went right at them.
I don't see distorting the tube to be a problem because the seal doen't run up that far, it would take more heat than most of us have access to to distort the tube. As far as honing, if its scored, maybe, but how to do it? Maybe take it to a shop.

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Max

03-27-2003 19:45:22




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 Re: Re: Re: Re: Breaking gland lose from cylinders in reply to Tom, 03-27-2003 16:41:28  
The teeth from the pipe wrench digs in real bad. Of all the several cylinders that I have rebuilt, only time the cylinder needed attention was from a pin hole or bent.



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