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John Deere Tractors Discussion Forum

1940 B oil pump

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Andy Keil

05-03-2011 02:32:56

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I took the bottom cover off the oil pump on my b (by mistake) and both gears fell out. I put the long shaft back in, but it is not engaged in anything. I looked in the parts listing and it shows a coupling somewhere. Shouldn't the oil pump not spin if the coupling is in place correctly?? and can I get to that if I take the other bolts out aand remove the oil pump al together?

Also shouln't the entire shaft of the oil pump be smooth? I noticed some rough spots on te shaft right above the gear.


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05-03-2011 05:11:29

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 Re: 1940 B oil pump in reply to Andy Keil, 05-03-2011 02:32:56  

You might as well remove the oil pump at this point and give it a good refit.

You will need to remove the crankcase cover and unfasten the oil line going to the pump. Do not try to remove the pump by pounding on the top. This is only a sheet metal cover to hold the screen, and you will bend it. Pry a little from the bottom after you remove the bolts.

By removing the pump, you can now easily clean up the screen, and even remove the screen if you want.

I redid a pump on my "37 B that had the shaft gauled up where it went through the housing. I decided to flip the shaft around so that an unworn part would go throught the housing. I had a machine shop mill the other end for the coupler, and cut a slot for the key for the gear.

Check out the housing and see if it was damaged.

Be sure to use a .020 gasket between the pump body and the cover.


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05-03-2011 04:38:46

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 Re: 1940 B oil pump in reply to Andy Keil, 05-03-2011 02:32:56  
UH oh. You will need to take the top crankcase cover off first so you can see where the oil pump shaft couples with the drive off the bottom of the camshaft. Yes there is a square coupling that drives the oil pump. If the coupling is not still on the cam shaft drive then it is probably laying on top of the oil pump housing in the bottom of the crankcase. How did you take off the oil pump cover by mistake? Dave

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Andy Keil

05-04-2011 02:30:49

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 Re: 1940 B oil pump in reply to greenday, 05-03-2011 04:38:46  
ITS KIND OF A FUNNY STORY....was trying to take off the first reduction cover, all was going good untill I found what looked to be a bolt coming from the inside out....later found out to be a dowel pin, but anyway took off a cover to see if I could reach in and get the bolt out....bad idea.

but anyways I got the oil pump back together without incident. thanks guys

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