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Discussion Forum

Bent cylinder rod

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Gregg Kuljian

01-03-2003 14:18:42




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I've got a hydraulic cylinder with a rod that has a fair amount of bend in it. Has anyone had luck unbending a rod. I know they do it in the shops, but these are pretty noodley. I'm just not sure how bent they can be before they weaken after unbending. And also is there a standard method for unbending? I think this is all pretty straight forward, but thought I'd ask...




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JMS/MN

01-04-2003 13:19:46




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 Re: Bent cylinder rod in reply to Gregg Kuljian, 01-03-2003 14:18:42  
If you don't have a press to straighten it in, use something like a heavy tractor. Support each end of the rod with blocks, and push down on the bend with a hydraulic jack below the tractor axle. You'll need v-blocks to roll it in to check for straightness, and you'll have to push it beyond straight with the jack, so when it springs back it ends up straight. If you go too far, just roll it over and bend it back. Any noticeable curve to it will still wipe out cylinder seals over time.

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Gregg Kuljian

01-04-2003 14:49:04




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 Re: Re: Bent cylinder rod in reply to JMS/MN, 01-04-2003 13:19:46  
Hey, thanks. I've got the tools to do the job, but my biggest concern is that this rod is hard as a file, and will crack when bent. But I'll just go for it! Thanks a mil. Oh yeah, this is bent about an 1/8 inch over two feet!



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JMS/MN

01-04-2003 22:18:04




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 Re: Re: Re: Bent cylinder rod in reply to Gregg Kuljian, 01-04-2003 14:49:04  
Sure would't worry about that much bend-taken out three times that much in an eight inch cylinder with no problems. They really aren't brittle, just the chrome surface is hard to protect it- good reason not to wang it by accident. Any imperfection on the surface will wipe out the seal. Chrome faced to resist rust=imperfection.



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