The first two digits represent the tractor’s frame size, or whether it is a 1,000, 2,000, 4,000 or 5,000 platform machine. For example, in CT2XXX the number two indicates that the tractor in question is a 2,000-platform machine. The digit following the first two numbers indicates whether the tractor has an open canopy (ROPS) or a deluxe cab. While a CT50XX has an open canopy, a CT55XX offers a deluxe cab. The final two digits in the model number represent the engine horsepower of each tractor.
WheelsAge.org '2005–н.ч.