Ken: Most Farmalls of that era have the plug forward of brakes, on clutch pedal side, about 1/3 distance from bottom on transmission case. It should be a 1/2" plug, maybe a bit larger.
Most of my experience has been 300 and 560. I had a 504 and 656, came with a farm I bought. I know the 656 had a dipstick, think the 504 did as well, but I didn't keep it so I'm not certain. That 504 and 656 were 1967 models, and that would be last year of 504. I know most early 504 used the fill to level plug.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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