IH made a lot of Hydro's they we're very proud of this innovative transmission. It was innovative in it's time. I think the following were made with hydro transmissions in addition to gear:
656 Hydro 666 Hydro ? not sure about this one
826 Hydro 1026 Hydro
966 Hydro 1066 Hydro
Hydro 70 Hydro 86 Hydro 100
Others
Hydro's were tremendous tractors for planting, hay (cutting bailing) and harvesting or anything that needed variable independant PTO and ground speeds. It's ability to creep was far superior to the optional creeper gears in todays tractors. HOWEVER it was terrible for tillage.
The drawbar HP was generally 30% less then the PTO HP versus gear that would only loose 10%.
Also, the transmission really didn't hold up under constant tillage.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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