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Alvin, do you know what type of tractor you have? If you have a 9n, or a 2n, or an 8n, then you have 3 drain plugs underneath and one filler plug. The fluid you use will all goes into one sump for the tranny, diffy, and hydraulic. These ford tractors were made up to 1952. If you have a later model than 1952, then you have 3 drain plugs, and 3 filler caps for 3 different sumps or compartments. Each sump is filled individually. However since you mentioned the F-4 manual, then the assumption is you have an N series tractor. First, drain the fluid by taking off the 3 plugs, start with the one on the rear first and move towards the front as they drain. Then take off the lowest bolt of the inspection plate (use your F-4 manual for a picture of the plate). It takes a little less than 5 gallons of fluid to fill'er up, so once you get close to that point, you will notice the fluid will begin to come out of the inspection plate hole. Then it's time to plug'er up. If you overfill, then you may have a problem with the fluid overspilling into the brakes via the rear axle (hence, reason for taking out the bolt from the inspeciton plate) The all round season fluid recommended by Ford/New Holland is 134 gear fluid. However, if you live in a year round warm weather area, as I do, then 80-90 gear fluid will work fine. AS a side note, if you find that the old fluid looks milky, yuky, and dirty, then try to clean inside before adding the new fluid. Find you a cheap garden sprayer and fill it up with solvent or kerosene or diesel and spray the stuff through the filler hole, moving it around as much as you can. (I normally take off the inspection plate and try to clean through there also.) Let it sit and drain for a while. Put in the new fluid and you are ready to go. Good luck. Davidz
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