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1942 JD Model B Oil Pump Drive Coupler


 
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Brandon K.
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PostPosted: Tue Mar 19, 2013 9:49 am    Post subject: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

I have been working on a JD B that I recently purchased. I took the breather cover off the crankcase to flush and clean the gunk from the crank case. At the bottom of the case I found the square coupler in two pieces. From what I can tell in the parts manual it lookslike the drive coupler for the oil pump. What is required to replace and install a new drive coupler? Are these common to breaking? Any help would be greatly appreciated!

Thanks,

Brandon
 
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RLA
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Joined: 31 Jan 2002
Posts: 1063


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PostPosted: Tue Mar 19, 2013 10:36 am    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

they are made to break to save the oil pump &
shaft. I think everyone has told you to clean
the crank case out completly.. The oil pump
must come apart & the shaft must be aloud to
slide straight down far enough to install a
new couple or a repaird coupler. If it's broke
it's because I Ice in the crankcase or something
is lodged in the pump.. With all that gunk some
is lodged.. The pump sqreen should be checked
also for a larger hole. When Cleaned out the
crank case...
 
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Mike M
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Joined: 31 Mar 1998
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PostPosted: Tue Mar 19, 2013 11:15 am    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

First make sure that it is not left over parts from a previous repair.

If yours is indeed broken off right now then you will need to get a coupling and then drop the outer cover and shaft down to install it.Get a new gasket from Deere. I perfer a good used old style couplings so they can snap if ever needed to in the future. The replacements are heavy duty and likely won't give before the gears or shaft.
 
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jdfun
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Joined: 30 Jun 2012
Posts: 32
Location: French Village, MO

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PostPosted: Tue Mar 19, 2013 1:44 pm    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

I have used couplers for sale . Contact me by email or call 573 535 8952. Thanks, Tom
 
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Brandon K.
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PostPosted: Tue Mar 19, 2013 4:24 pm    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

Can some one give me some pointers on removing th oil pump and changing the drive coupler. I understand the cupler goes onto the pump shaft but what does the other side go on to? What drives the pump shaft? Thanks
 
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donwisc
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PostPosted: Tue Mar 19, 2013 4:26 pm    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

If you are comfortable with having a coupler that wont brake, take an old 1/2 inch drive socket, smallest you got and grind off the socket portion leaving only the 1/2 in sq drive left. This is almost exactly like the deere replacement, but again only if you dont expect to freeze up the pump. Good luck
 
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greenmech
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PostPosted: Tue Mar 19, 2013 6:03 pm    Post subject: Re: 1942 JD Model B Oil Pump Drive Coupler Reply to specific post Reply with quote

The other end of the coupler goes into the worm drive on the camshaft. You may need a helper to guide the assembly together. Ron Mn.
 
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