Choosing a transmission is increasingly important. Big engines may generate big power but they can’t do a thing without a way to translate that power onto the ground. Transmissions facilitate that process. Technically speaking, they provide a speed torque conversion from a higher-speed engine to a slower more forceful application.
Hydrostatic transmissions are simple, with no clutching and the ultimate flexibility when driving a combine. Two of the main hydrostatic suppliers are Sundstrand http://www.sundstrand-hydraulics.com/andEaton http://hydraulics.eaton.com/products/trans_main. htm.
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It’s quite a bit different for tractors, but the technology is improving and as you can read below, manufacturers are competing to produce a seamless and productive experience for the operator.
Massey Ferguson Dyna
Massey Ferguson offers the Dyna family of transmissions, including the Dyna-4, Dyna-6 and the Dyna-VT.
Dyna-4: Found on the Massey Ferguson 5400 Series tractors, the Dyna-4 is controlled by a single T-handle that allows completely clutchless operation. A rotary dial lets you adjust the sensitivity of the shift to customize the tractor to individual specifications.
Dyna-6: The smooth-shifting Dyna-6 transmission comes standard on all Massey Ferguson 6400 Series tractors. Speed matching automatically selects the right power shift speed in each range for smooth acceleration. Auto Drive allows the operator to select the RPM in which the tractor will react to changing load requirements. The Dyna-6 also allows for gear-changing and forward/ reverse power shuttling without using the clutch pedal.
Dyna-VT: The Dyna-VT continuously variable transmission features smooth, infinitely variable speed control, with two ranges from 0 to 17 m. p. h. for field applications and either 0 to 25 m. p. h. with the standard front axle or 0 to 31 m. p. h. with the optional front axle suspension system. Featured on the 7400 and 8400 Series, the Dyna-VT moves from super creep to transport speed without shifting or jerking or any delay in traction or power.
Case-International CVT
Case-International features their CVT (Continuously Variable Transmission), which the company says is a hybrid transmission, both mechanical and hydro (hydraulic pump and motor) with infinite speed variability. For 2009 these transmissions can be equipped on the Puma series tractors between 165 and 225 horsepower.
Infinite speed variability has a standard speed of 98 ft./hr. with an optional maximum speed of 30 m. p. h. The speed selection is measured in 0.1 m. p. h. increments. These transmissions set speed at 25 m. p. h. at 1,250 r. p. m. and 30 m. p. h. at 1,550 r. p. m.
According to the company, the CVT transmission delivers unprecedented fuel efficiency, whether at creep or at road speeds. For example, achieving transport speed at only 1,250 engine r. p. m. saves significant fuel, helping manage one of the most critical input costs on the farm today.
The CVT is managed from the operator station by a multi-function transmission control lever, which controls speed ranges and a forward reverser.
