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Farmall 450 steer shaft problems

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old

08-05-2004 14:51:02

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Went to replace the sterring wheel on a 450 and the treads stripped and sos the nut. Got a new nut and was going to renew the treads with a Die but can't seem to find out what size I need I think its 13/16 but not sure and if it is where in the world do I find a die that sixe I can get 7/8 and 3/4 dies but have yet to find a 13/16. Any ideas on how to fix my problem???? Thanks for any help

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Joe Evans

08-05-2004 20:41:24

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Re: Farmall 450 steer shaft problems in reply to old, 08-05-2004 14:51:02

Just got done with a similar (if not the same) problem with a 460. The steering shaft was approximately 7/8 OD and had a VERY fine thread on it. The threads were in bad shape and the thread pitch was VERY fine and therefore strange. I attempted to rethread the shaft with a 7/8 UNF die (can't remember the thread per inch count, maybe 7/8 -14 UNF). The die did not bite into the shaft enough to yield adequate threads. Knowing that a course thread bites deeper into the stock material, I used a 7/8-9 UNC die. The threading went fairly easy. The new threads are not perfect as far as depth is concerned, but after all, your not asking the nut that holds the steering wheel on to do that much work. Turned out great. I have NEVER heard of a 13/16 diameter thread.

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lee

08-05-2004 21:15:03

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Re: Farmall 450 steer shaft problems in reply to Joe Evans, 08-05-2004 20:41:24

In the typical UNC and UNF sizes there are no 13/16 sizes but 13/16-20 is defined in the UNEF sizes. There are lots of not so common thread sizes out there. Your experience with the 7/8 dies seems to indicate the 460 steering shaft thread is smaller than 7/8 thread so this 13/16-20 may very well be it.

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Joe Evans

08-06-2004 05:52:06

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Re: Farmall 450 steer shaft problems in reply to lee, 08-05-2004 21:15:03

Lee: to find out what I was dealing with, I miked the end of the steering shaft. It was bunged-up, corroded and a bit out of round, but the average reading I got was around .850, so I concluded the shaft was .875 at one time.

The existing threads were of poor quality and seemed to be 20 threads per inch according to a guage I had. Is there a 7/8-20 UNEF thread? With nothing to lose, I first attempted to rethread over the very fine thread with a 7/8-14 thinking that this will bite deep into the existing threads and form (rather crude admittedly) new threads. There wasn't enough material there, but the 7/8-9 did the trick. It's not a perfect fix, but usable.

I re-bushed the hole where the shaft enters the dash casting--whatever was there originally was gone. A 7/8 ID x 1 OD bronze flange bushing fixed this slicker than snot on a pump handle. I had to polish the shaft's OD a bit at the area where the bushing was going to go so that the bushing would slip into place over the shaft. This confirmed the shaft's OD as 7/8".

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scotty

08-06-2004 11:35:16

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Re: Farmall 450 steer shaft problems in reply to Joe Evans, 08-06-2004 05:52:06

Joe, Just to add to what Lee has allready stated, it sounds like you have a micrometer or caliper to check diameter. For a few dollars you can buy a thread gage that you lay atop the threads to determine the threads per inch. I have two gages, one is 9thds to 40thds, the other is 2 1/4thds to 20thds. They are very helpful in determining what you have, as Lee stated there are a bunch of mungrols out there! Better than counting thds!

scotty

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Joe Evans

08-06-2004 14:29:58

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Re: Farmall 450 steer shaft problems in reply to scotty, 08-06-2004 11:35:16

Thanks for the suggestion. I will add that to my want list. Just for the record, my brother had a thread gauge similar to what you describe. He determined it was 20 threads per inch. Hmmm...7/8-20 thread. That's an new one on me. Due to my eagerness to get the steering wheel resolved that day and with the likelihood of finding a 7/8-20 nut on a Saturday being zilch, I opted for the fix I gave it.

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lee

08-06-2004 14:58:58

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Re: Farmall 450 steer shaft problems in reply to Joe Evans, 08-06-2004 14:29:58

my only point was that if you need it, it's out there. You did the cheapest fix that could be done. The other way, it's a special nut and a one time use die.

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lee

08-06-2004 06:45:48

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Re: Farmall 450 steer shaft problems in reply to Joe Evans, 08-06-2004 05:52:06

below is the list for UNEF thread sizes. 7/8-20 is in there. It's often difficult to determine an uncommon thread even if you have a
good one to work with. 13/16 is .8125 so if you came up with .850 that't closer to 7/8.

http://shopswarf.orcon.net.nz/unef.html

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lee

08-05-2004 16:34:46

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Re: Farmall 450 steer shaft problems in reply to old, 08-05-2004 14:51:02

first step is to verify the thread size and
number of threads per inch. You will have to do some accurate measuring, thread counting, detective work, whatever it takes. Don't know what more to say than you need to know exactly what die you need. 13/16-20 is a UNEF size. Not real common, but it can be had if you know that's what you need. Below is a source that has a set with that size in it. They don't seem to sell the individual die as far as I can tell. They would have to be contacted. The second site below shows the UNEF sizes. More common sizes are UNC and UNF. If you do a net search on threading dies, rethreading dies, thread chasers, you will find companies but you may have to contact them and inquire on that size, it's not that common.

Link

http://shopswarf.orcon.net.nz/unef.html

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lee

08-05-2004 17:58:21

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Re: Farmall 450 steer shaft problems in reply to lee, 08-05-2004 16:34:46

I was looking at the Jawco spindle re-threader dies again. It says in the description you can order the dies individually.

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