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John Deere Tractors Discussion Forum
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1950 Model A steering play.

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gurneejoe

09-28-2006 13:45:54




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The vertical steering shaft at the front post has about 1/4" side to side play. Even with the books, I can"t figure out if this is an adjustment or a bushing worn or what. What does the eccentric bushing adjust? Worm gear backlash? The front end wobbles at high speeds (6th gear). Not really the end of the world. Just being a perfectionist and trying to see if it is something I can remedy.




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gurneejoe

09-30-2006 04:29:55




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
I want to thank all of you for your time and help. The information is appreciated. This forum is like gold to me.



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Pappy

09-29-2006 21:08:59




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
Yes-you can remove the eccentric bushing from the top. Remove the big nut on top, remove the sector gear and pull the bushing up and out.
The best way to remove the sector gear is to jack up the tractor one inch. Remove the big nut, place a soft big (brass) hammer on top of the shaft and whack it firmly twice with another hammer. The shaft should fall out of the gear. Now, you can pull the bushing up and out.

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almrm

09-29-2006 09:15:24




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
The adjustments and inspection for wear are well described by others. If you take the sector gear out and clean it up, the wear is evident and as stated, more severe in the center or strait position. The contact points with the worm gear are relatively small. To extend the life of the gear, you can add wear to the sector gear teeth away from center with a dramel tool, sanding disc, and steady hand. It is a flat grind with no contour. Just replicate the naturaly worn teeth as close as possible. This will allow the gears to be set closer without binding on the turns.

BTW - I have a 48A and have loaded the tires with rim gard front and rear. Loaded fronts normally do not wobble. This does not help the paraders, pullers, and showers, but if you work your tractor and need ballast, this is a nice side benefit.

Good Luck,

Mark

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mitchp

09-29-2006 07:31:49




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
like john t said be careful moving that eccentric cause it will bind at the ends and could burst the housing, a new sector gear would help alot, i know it did on mine, thats all i replaced and mine steers like new now. you can watch ebay and sometimes a new one will be on there.



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John T

09-28-2006 19:41:10




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
The first thing I try to reduce excess steering shaft play is to see if its possible to remove some of the shim gaskets (used to adjust/preload the end bearing) out under the front steering shaft bearing end cap in order to lessen any front n back play in the shaft itself. Next thing is to adjust/rotate the eccentric bushing to move the sector gear closer over against the worm. To do that you have to remove the top pedestal cover then remove the grease n gunk to locate the vertical stop set screw thats in one of the open half moon adjustment registers in the base of the eccentric bushing, and then remove it so you can rotate the bushing in the direction to move the sector closer to the worm stopping at another open half moon register so you can reinstall the stop set screw. NOTE AND CAUTION since most wear is in the middle or straight ahead position you cant set the sector too close to the worm there cuz then it may bind out near the ends.

Nowwwww w if the bushing or the bore is worn out where it fits down into the pedestal such that you cant get the sector close enough to the worm or its just such a sloppy fit steering play remains despite any adjustemnt, you may have to get the eccentric bushing built up and machined to fill the bore or use another bushing or I DONT KNOW WHAT I seem to recall some discussion of drillign and tapping a horizontal hole to use a bolt to force the entire bushign over closer but I cant rememebr the whole story.

John T

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gurneejoe

09-28-2006 17:48:37




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
After I sent in the question I was staring at the parts breakdown and it dawned on me that the slop was in the eccentric bushing. Duh. So, that said, can it be removed from the top by removing the nut? The question is, can it be changed without taking the front wheels, post, whole flying circus, etc.out? I hope. By resizing, you mean what. Brazing up the inside and reboring?



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jdhbag

09-28-2006 17:24:05




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 Re: 1950 Model A steering play. in reply to gurneejoe, 09-28-2006 13:45:54  
There should be no play in the ecentric bushing. With that much side play you will get lots of front wheel wobble. You will have to either get a good bushing or bush the one you have. The back lash is controled by shims between the housing bearing and the pedestal. Be careful though on how much wear you have on the worm and sector. There can be binding .. which is not good.. at the extremes of your stering. In other words it could be very loose in the middle and very tight at the ends of stering travel.

The IT-JD4 service manual has a good explination of this.

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