John Deere T 660i

Operating experience: performance in the field

When operating a John Deere T 660i, the first thing you notice is the power reserve of the 9-liter PowerTech engine. It handles heavy crops and wet conditions without losing RPM. The main advantage of this machine is the walker separation system. Unlike rotors, it is much gentler on straw, which is a major benefit if you need it for baling. Grain samples in the tank are consistently clean, even in dense wheat fields.

Maintenance and serviceability

Maintenance is well-thought-out. Daily checks are quick since all grease points are grouped, and filters are easily accessible. The machine is heavily computerized, so having access to the Service Advisor diagnostic software is essential for troubleshooting. Mechanically, the T 660i is robust; the chains, shafts, and belts last their full service life as long as you follow the maintenance schedule.

Cab and operator comfort

The air-suspended seat and excellent soundproofing are lifesavers during long 14-hour days. Visibility is top-notch, and the CommandARM console makes machine control intuitive—you get used to it within a few shifts. The AC system is powerful enough to keep the operator productive even during peak harvest heat.

• Fuel efficiency: Highly dependent on load, but the engine power management system keeps consumption competitive.
• Separation: The straw walker system is soft, ensuring minimal grain damage.
• Chassis and cooling: Passability is excellent, but keep the radiators clean—dust buildup is a common issue for this series in dry conditions.

In short, the T 660i is a reliable workhorse for farms that prioritize grain quality and straw integrity over raw throughput speed.