wrapping my head around the VT transmission in my rented 6616 MF..
Basically, it's a ring gear, with 3 planetary. The input is engine driven, which also drives an adjustable (via 'gear shifter') volume hydraulic pump.. This oil then is used to run a motor that regulates how fast or slow this ring gear turns.
Looking at both extremes, a 'locked' ring gear would be one end of the gear reduction spectrum, where this gear that is turning as fast as the input shaft would be the other. Every point in between would be our available 'gear changes'. How fast or slow this gear is allowed to turn is adjusted by the 'gear shift' lever, which changes how much oil is pumped to the motor. A swash plate type adjuster is what changes the volume. Still a gear drive, but 'regulated' via hydraulics.. Not sure, but i think reverse is entirely hydraulic.. I may have to watch the youtube tutorial a couple more times
The transmission is simple as a post, but what concerns me is the complexity of the system that 'runs it'. a LOT of wires, sensors, switches to go haywire in the future... But what new tractor isn't? Dealer called me the other day, wanting to sell me the tractor.. 'just use the rental money as your downpayment'.. So i'm crash coursing myself on all the in's and out's. I've got about 60 hours on it, using it in my worst case scenarios of haying in the steepest hills, and some of the heaviest crops of the year. 8 foot tall forage sorghum @ 5.5 mph through the mower is awesome to watch from the seat. It runs the 16 foot disc conditioner a lot easier than my 3545 ever did, at speeds I never imagined. I accused him of using drug dealer tactics.. LOL, putting that 'candy' in my hand, and knowing I'd be 'hooked'.. Tractor would be a haying, and planter *8 row, or 20 foot drill stuff. So 150 hp is plenty.. it sure uses less fuel than the 3545.. But, that 'saving' is burned up with the DEF. No more clouds of black smoke is nice.