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Case Tractors Discussion Forum
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Case L - Magneto to Governor Connection

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Steve (DE)

01-11-2006 18:12:05




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I'm working on a 1930 Model L, and I've gotten to the magneto. When I got the tractor it had a 1940's Case mag on it, and I've gotten a Robert Bosch FU4A to put on it, like what it had when it was new. The mag has a C-125 impulse coupling on it, which has a flat face with two lugs and a center hub. The governor has a connector (part no. 9-AA) on it with a hex nut compression fitting arrangement and a woodruff key to hold it in place on the governor shaft. This 9-AA connector also has two lugs on its face. Between the mag and the gov is supposed to be a connector disc with a large hole in the center, and with pairs of slots on either surface (part no. 01799 AB). Problem is that the diameter of the connector disc I have is larger than the inner rim of the rear of the housing on the mag C-125 impulse. What do I do here? I'm guessing that 01799 AB must have come in different diameters over the years, since the number never changes from the 1929 to the 1947 parts books. Can I just turn down the diameter of the coupler so it doesn't touch the impulse housing? What do you think?

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Glen in TX

01-11-2006 22:01:22




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 Re: Case L - Magneto to Governor Connection in reply to Steve (DE), 01-11-2006 18:12:05  
Steve, If the float coupler you have is the right thickness then yes you can just turn down one end of the diameter some to clear the mag housing. I have some float couplers for other applications that are made that way with a step down in diameter so it is not a uncommmon thing there. I make mag couplers from UHMW plastic when I can't find the phenolic couplers in the right size and the UHMW is easy to turn and mill slots in but yet stands up well for the job.

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Steve (DE)

01-12-2006 08:08:44




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 Re: Case L - Magneto to Governor Connection in reply to Glen in TX, 01-11-2006 22:01:22  
Glen, thanks for your reply. The coupler I have is steel, but I only need to take off about 1/8", so I don't think I'll have much problem. Any thoughts on how much clearance there should be, not on the diameter, but between the coupler and the "drive" elements on the mag and gov ends?

Thanks again, Steve



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Glen in TX

01-12-2006 09:49:40




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 Re: Case L - Magneto to Governor Connection in reply to Steve (DE), 01-12-2006 08:08:44  
We see the steel couplers on a lot of the Case L & LA here too but most all have the Case mag or later MJA Bosch mag. I think some recommended about 1/32" clearance. You don't want too much or coupler will flop, vibrate and wear faster.



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