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Proper way to check Hydrostatic fluid level


Kokomo

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I ran across an operators manual for a 712H-716H sold new in 1974. It gives the proper way to fill the Hydrostatic fluid is to hold the vent open and add two quarts of fluid or until tube is full and will no longer hold any more fluid. Then it says to: “Press free wheeling latch down firmly to disconnect the hydrostatic pump…With engine running at idle speed, again hold the vent rod up and pour more type F automatic transmission fluid into the transmission fill and level tube until level is stabilized at about 1 inch below the top.” The manual also says that the tractor should be running when every you check the fluid level in the transmission. IS THIS THE PROPER WAY TO FILL AND CHECK ALL HYDROSTATIC TRANSMISSIONS FROM 1974 TO THE LAST ONES MADE? I know that the kinds of transmission fluids has been discussed in the past; however, is there a reason why Simplicity used both Type F fluid and Multi-purpose Hydraulic/Transmission Oil in their hydrostatic transmissions? Did they change seals that required different fluids? Are these types of fluid interchangeable? Bob in Kokomo
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It is still the same procedure and it is all in the same stuff just called a different name and you do not have to use type F as type F is getting hard to find and mircon is the replacement for it. Multi-purpose Hydraulic/Transmission fluid was simplicities name for it to sell there own product. All types of oil are a hydraulic fluid as well as water is one. ATF has built in cleaners in it as well as anti foaming agents and is a very good lubericant.
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