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Tractor Talk Discussion Forum

Maybe I'm just too strong-ya think??.

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coloflyboy

07-15-2007 16:23:42




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Had a bucket load of rocks in my 641 Ford and was backing up a hill when my steering shaft broke. You know, the one connected to the steering wheel.

Long story short-the gearbox and shaft looked new so why did it break.

Called B&M tractor parts in Taylor, TX and ordered a new one. They told me these boxes were being rebuilt using inferior metal for that shaft.

I'm not a metalurgist(don't even know how to spell it) but the metal where my shaft broke looked bad. It appreared to have been broken almost all the way through when it was formed and was hanging on by a 1/4 inch piece which finally let go.

The purpose of this post is to just make you aware that there is some bad rebuilt steering boxes out there. I've got a Ponderosa tree with a big divot in it to show what can happen. Of course it could have been worse.

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dhermesc

07-16-2007 06:17:44




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 Re: Maybe I'm just too strong-ya think??. in reply to coloflyboy, 07-15-2007 16:23:42  
After 45 to 50 years of service things tend to break.



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paul

07-15-2007 21:41:16




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 Re: Maybe I'm just too strong-ya think??. in reply to coloflyboy, 07-15-2007 16:23:42  
That's nothing - dad had both axles (at different times) on the IHC 300 break under him - same deal, they didn't form the iron right when heat treating them, had cracks that grew.

--->Paul



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big fred

07-15-2007 20:07:17




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 Re: Maybe I'm just too strong-ya think??. in reply to coloflyboy, 07-15-2007 16:23:42  
A fatigue failure will look like that. It starts as a surface crack, then over time the crack grows until the cross section left isn't sufficient to carry the load. The only section that won't look "old" is the last section to fail, as the crack allows corrosion to commence almost immediately.



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Dave from MN

07-15-2007 16:26:32




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 Re: Maybe I'm just too strong-ya think??. in reply to coloflyboy, 07-15-2007 16:23:42  
Was it made in China??



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Mathias NY

07-15-2007 17:30:13




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 Re: Maybe I'm just too strong-ya think??. in reply to Dave from MN, 07-15-2007 16:26:32  
I'm not sure when it happned but Ford did have a plant in India. They were making the xx10 series tractors their when New Holland took over. Depending on when they started making parts for Ford there could have been some serious metalurgical defects.

Incidentally, New Holland sold the factory (along with molds and designs) to Long. They now make a nearly identical tractor at that factory and call it a FarmTrac.

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coloflyboy

07-15-2007 17:05:25




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 Re: Maybe I'm just too strong-ya think??. in reply to Dave from MN, 07-15-2007 16:26:32  
Good question Dave. The steering gear box housing parts appear to be original and have Fords typical markings stamped on them.

The worm gear, which is welded to the steering shaft, has no markings.

The gear nut is made from what appears to be a brass alloy. It is quite crude with processing marks all over the sides, but no numbers.

The Pittman arm bearings are tight with no leaks.

The top and bottom shaft bearings look good. Neither the worm gear or the gear nut have significant wear

The break is about 3 inches above the worm gear. It appears that improper tempering methods were used when welding the worm gear to the shaft as the metal in that area is blackish and not a metallic color as is the rest of the shaft.

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souNdguy

07-16-2007 06:22:54




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 Re: Maybe I'm just too strong-ya think??. in reply to coloflyboy, 07-15-2007 17:05:25  
Is there any deflection in the steering tube that runs up thru the sheet metal? I had a steering shaft break on my 8n 2x before i noticed that the sheet metal was slightly bent, thus putting some pressure onthe steering tube, and thus the steering shaft.

I had mine pinned and welded by a good machinist and it has been holding for about 4+ years now..

soundguy



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