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Big John was factory spec’d as an air seeder tractor and thus has three hydros but none of them are used for propulsion. I had to search for a bit to find a low hour air seeder tractor with a mechanical 24 speed transmission.A hydro adds ease at the expense of HP.
Hey @jblnut does "Big John" have a hydro?
Largest true hydro tractor I know of was the International Hydro 186. Great chore tractor but a horrid field tractor for tillage or anything heavy. Using fluid for propulsion creates a pile of heat which needs to be dissipated and results in a large loss of efficiency.
For what the OP is looking to do with a tractor I wouldn’t hesitate to find a machine with a shuttle shift of sorts. All brands call them something different but they will all function the same. A shuttle shift machine will have a power shift between forward and reverse which will require no clutching to change direction. The F/R lever is usually located on the dash of steering column. Some earlier Deeres had the shuttle on the right console. We have a 7210 with the high speed trans and it has a single F/R leer along with a 1-4 power shift gear selector and a clutch required A-E range selector. It’s an amazing machine and goes 28mph down the road and is a dream to operate.