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Ford 9N, 2N & 8N Discussion Forum
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Dearborn SBM Knives

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Pooh Bear

07-24-2006 10:11:32




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Can I get new knives for my 1954 Dearborn 14-67 6 foot sickle bar mower?
If so, where? Tractor Supply?
I see them on Ebay sometimes as NOS. But what about just new.

I was kinda hoping all SBM knives were a standard one size fits all thing.
If not, how do I know the ones I see on ebay will fit.

Another question. I see on ebay sometimes bolt kits to change out the rivets.
This sounds like a great idea to me. What do ya'll think.
Is there a downside to using bolts for this.

Thanks.

Pooh Bear

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Fordfarmer

07-25-2006 08:03:49




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 Re: Dearborn SBM Knives in reply to Pooh Bear, 07-24-2006 10:11:32  
I use the section bolts in both of my mower/conditioners. Wouldn't EVER go back to rivets. You do need to make sure there is enough clearance under the hold-down clips, but otherwise, easy swap. Experience tells me that rivet tools beat a hammer, chisel, and punch, but the point for driving out rivets likes to break. (One of my mowers has a few riveted sections left, so a hammer and chisel are in it's toolbox.)Bolts that are made for this job have a ribbed shank that has to be squeezed down to fit the hole in the sickle, so it's kinda like a rivet that way. One other thing is make sure you use a *small* wrench to tighten the self-locking nuts on those bolts. Easy to twist off.

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murnga

07-24-2006 12:37:34




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 Re: Dearborn SBM Knives in reply to Pooh Bear, 07-24-2006 10:11:32  
Pooh, a lot of places sell these knives,they are the same as the later Ford's. Ask for 141113 standard serrated or 141198 h.d. serrated. The mfg's used different hole spacing,the New Holland is a little off from the Ford. New Holland stocks the old Ford knives. Bolts might be an easier fix in the field but make sure you have enough clearance under the hold down clips. Some models require a higher clip.

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Pooh Bear

07-24-2006 18:43:15




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 Re: Dearborn SBM Knives in reply to murnga, 07-24-2006 12:37:34  
Thanks for the part numbers.

I'm mostly afraid of the rivots.
How well do the rivot tools work.

Thanks.

Pooh Bear



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duey

07-24-2006 21:26:14




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 Re: Dearborn SBM Knives in reply to Pooh Bear, 07-24-2006 18:43:15  
The thing that is great about rivets is that the shanks swell to fill the holes even if the holes aren't real true. They provide great clamping pressure, too.

A bolt will not "fill" a hole or an oversize hole. A bolt has ONLY clamping pressure to hold the joint together.

The guys that have rebuilt the front bumpers for their Ns and other Fords have set LARGE diameter rivets... 3/8" or more? Nothing better to hold a joint together.... My opinion..... duey

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Kelly Jewell (KY)

07-25-2006 10:20:36




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 Re: Dearborn SBM Knives in reply to duey, 07-24-2006 21:26:14  
duey, the sickle bolts have splines that are made for the backs that have a punch press hole. Later years Kondex drilled the backs for a straight hole. These bolts need to be driven into the early backs as they will pull apart if the nut is used to put them in place. They work extremely well if installed correctly.



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BillM (OH)

07-24-2006 21:03:50




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 Re: Dearborn SBM Knives in reply to Pooh Bear, 07-24-2006 18:43:15  
We always used rivets in the good old days. Need a ball peen hammer and a railroad iron (top of the vise works too) - never had a problem.



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