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AC Model B Third Gear Problem

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Marv

09-04-2001 05:05:44




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My 1949 AC Model B will not stay in third gear by itself. If I hold it in third it will drive along fine, but as soon as I let go of the shifter it will pop out of third gear into neutral. Can anyone out there help this poor old farmer?




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Marv

09-07-2001 02:56:10




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 Re: AC Model B Third Gear Problem in reply to Marv, 09-04-2001 05:05:44  
Thank you guys. I have the tractor split right now and will take a look at your suggestions.



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steve

09-04-2001 19:40:06




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 Re: AC Model B Third Gear Problem in reply to Marv, 09-04-2001 05:05:44  
Marv, it is not uncommon on a 50 year old tractor, it is also not real easy to fix. On the right side of the transmission next to the shift lever is a 6 inch diameter round plate that holds the shift forks. You can take it off and look inside and get an idea of what is going on. Probably will not be the shift forks or slides. You will probably see rounded teeth which means transmission removal and $$$ if you get that energetic.

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Tom

09-04-2001 17:44:11




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 Re: AC Model B Third Gear Problem in reply to Marv, 09-04-2001 05:05:44  
I believe the dogs, (teeth on the sides of third gear) that engage for third are worn from long use and grinding into gear. I had this problem with a B. New parts are more expensive than a parts tractor. A "C" will work too. It might be possible to take it apart and carefully file or grind the surfaces that engage flat again. This would slightly increase backlash but probably not too much or enough to notice. I haven't tried this.

Tom

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