1938 John Deere Model D Transmission Filler Plug

Todd Widener

New User
I just got my 1938 John deere Model D in March and have been researching the lubricating schedule for it. The "Transmission Filler Plug" on my 38 and the drain plugs are square with cuts in each corner. The plug looks to take a 3/4" drive to open and close it, but a 3/4" drive is just barly too big for it.

Is there a tool that I need to find that was used back when it was made, or is there one that I can use in it"s place that I can find in a hardware store? The cuts in the corner of the square make me think the device was more like a key of some kind?

Any Ideas?
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You could make your own tool. Find a square headed bolt that might fit it or a larger bolt and grind down the head till it fits. Than run a nut down on the threads and weld it to the bolt. You can then use a socket or wrench on the nut. Worked on mine and not hard to make.
 
Buy 12 inches of 3/4 inch key stock heat it to cherry red 2inches from one end and bend 90* file or grind to fit. do both end s now you can use it like a allen wrench.
You can also look on ebay for dog bone tool which has several sizes on each end.
 
Spike tooth harrow tooth is what was commonly used, head on a lot just fit in and put a straight wrench on square part and turn, if did not quite fit it was ground to the point of fitting.
 
The female hole was .760 when new. Yours may be filled up with layers of paint and etc. I use a 3/4 x 2 inch extension. I just drive the extension into the plug with a small hammer. Use a breaker bar to remove and reinstall the plug. When tight you can rock the extension just a little and it will come right out. Been doing it that way for over forty years and it has always worked.
 

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