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Implement Alley Discussion Forum

Bowed sickle bar

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ScottyNY

09-19-2005 11:06:08




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Looking for ways to straighten out one of my sickle bars on an old IH Model 21.

I got carried away pounding away on the old sections to shear the rivets and wound up with a bowed bar.

I've tried beating the bow out of it on an anvil with the bow up but with limited success.

Thinking I need a clever idea for a jig to straighten it with heat, but any tips are welcome.

That failing, a good source for a replacement would be welcome, too. I hate not having a spare around.

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dorset farmer

09-20-2005 06:04:43




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 Re: Bowed sickle bar in reply to ScottyNY, 09-19-2005 11:06:08  
I've been there with you. I had some decent luck by manually bending it with s portion held in a vise. Changing one section per time will minimize the problem. One can no doubt get a new knife from the dealer or try sickleservice.com. Switching from rivettes to bolts is probably the best way to go. Mike



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Larry806

09-19-2005 19:27:03




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 Re: Bowed sickle bar in reply to ScottyNY, 09-19-2005 11:06:08  
Hey Scott I think you mean the section knife not the bar don't you? The knife will work its self out. Be careful pounding rivets that will stretch the knife and your register will be off and than it is junk. I did that to a combine knife once



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Dave H (MI)

09-19-2005 19:01:19




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 Re: Bowed sickle bar in reply to ScottyNY, 09-19-2005 11:06:08  
Here I go being a pain in the a$$, but did you ever think to get one of those sickle riveting tools? New at TSC or cheap at auctions.



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old

09-19-2005 11:17:23




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 Re: Bowed sickle bar in reply to ScottyNY, 09-19-2005 11:06:08  
Every time I do what you did as far as new secktion my bar always bows a little. I just put it back on and go with it and have never had any problems. And whats funny is when I pull it out again for the section replacement its like it had never had a bow.



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ScottyNY

09-19-2005 12:10:03




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 Re: Bowed sickle bar in reply to old, 09-19-2005 11:17:23  
I had wondered if that might be the case, thinking a little heat from friction coupled with some force in the right direction(s) might straighten it out.

I may have a few more whacks at it on the anvil and give that a try.



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Illinois Boy

09-19-2005 12:58:22




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 Re: Bowed sickle bar in reply to ScottyNY, 09-19-2005 12:10:03  
I wouldn't worry too much about it. Put it back on the cutter bar and have at it!!
The whole thing, bar and blade, are pretty flexible - designed that way... as long as it slides along the cutter bar - you're in good shape. I always coat the bar good with some used motor oil before I hit the hay. Just run it some weeds to clean off all the excess oil and go cut.



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john schneider

09-22-2005 13:33:39




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 Re: Bowed sickle bar in reply to Illinois Boy, 09-19-2005 12:58:22  
I can second or third these other comments about not worrying about it too much. I just changed all of my sections and it of course came out bowed pretty good. Replaced it and turned the pitman pulley a few times by hand. There was a bit of cluncking but when I hooked it up and ran it at idle for a few moments, everything went back to normal



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