Bill..... ....how does the local service station or dealer mechanic check your differential oil level? It doesn't have a dipstick. He pulls the fill plug and if nuttin' drips out, he gives it a squirt of diffy oil, till it does dribble out. Very early production 1939 9N's didn't have a dipstick in the 6" round inspection plate under your right butt, they did have a fill port along side the tranny which you filled to overflowing. Howsomevers..... you can get a "good guess" by pulling the bottom bolt of your 6" round plate. If nothing dribbles out, your low. Top it off till it dribbles. But in the big scheme of things, your hydro/tranny holds 5 gals of Ford/New Holland M2C-134D hydro/tranny oil, and can actually work for a short time with only 3 gallons, but I don't recommend it. Most of the 5 gals acts like a heat sink or radiator to assorb hydraulic pump heat. (you knew that pumping oil generates heat, didn't you?) Matter of fact, you spend 8 hrs straddleing that tranny brushoggin', yer gonna get roasty-toastys (grin)..... .....respectfully, Dell
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