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1948 A John Deere shimmies

J

John Francis

New User
My 1948 A John Deere shimmies (front wheels) when going down the road in 6th gear at about 70% throttle and above. I know many old John Deeres do this. What's the fix? Also same tractor doesn't run without pulling choke out slightly. Cleaned carburetor and thought I had it fixed. Problem has returned. Put an inline fuel filter on. Carburetor not adjusted correctly?
 
I fixed the that on our JD A many years ago. Their is a way of adjusting it and I don't remeber how it was done. I know if you can find a manual for that tractor it tells you how to addjust it if it is not worn to bad.
 
If setting still with the tires straight agead you ca turn the wheel 1/4 turn without moving the tires then it is more than likely the steering sector gear worn. You can adjust the sector gear closer to the worm gear by rotating the concentric bushing and it will tighten up the lash BUT once you turn the wheel further past the well worn part then it will be way too tight because you are now into the unworn teeth. If that is the problem then you will need to replace the sector gear. If there is minimal steering wheel movement then jack weight off front end and check out the slop in the roll-a-matic front end bushings/bearings (assuming it has roll-a-matic). What ever it is it's pretty bad to cause wobble so you shouldn't have a problem finding it. Spin tires also to make sure one isn't junk. A manual is a nessessity here , though. You may be able to go online and find the info/pics also.
 
Sometimes the wheels are slightly bent and will do that and to cure that we have put a couple of flat washers on the lug bolts on one side. With the wheel off the ground rotate it and see if it wables and if it does then try putting washers behind and turning untill you see no more wabble.
 
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