You sure it's a '51 TO-20? they also made to-30's in '51. What's the serial number?
Nonetheless, the oil fill is on top of the tranmission shifter housing. The spec calls for SAE90W mineral oil in Summer and SAE80W in winter. Most people use a good Universal Tractor Fluid (UTF) the meets the MF specs. Some people use engine oil. It takes 24 qts (6 gallons) to fill the transhydraulic system and if you are draining the system there are three drain plugs on the bottom and you should let it drain overnight. It's wise to take off the right side access panel to clean the sumps if you can. If you pull the pto shaft(4 nuts) you can get access to all the sumps, spray some diesel or other solvent in and mop all the sluge out before you replace the fluid. (I would recomend using the tractor and draining the fluid while it is still warm.) When filling, replace all the removed parts and leave the bottom bolt out of the right hand access panel. Fill through the transmission port with five gallons of fluid and let the fluid equalize for a few hours. The put the last gallon in. Jeff(OH) has a sump cleaning method he has posted in the archives or in the TIP OF THE DAY so you might look that up.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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