At the end of 1993, the 6000 series was expanded with 6-cylinder models, initially two: the 6600 with 110 horsepower and the 6800 with 120 horsepower. The 6600 had the familiar 5.88-liter engine, and the 6800 had a new 6.8-liter engine. Both were turbocharged and, unlike the 4-cylinder models, came standard with a viscous fan. The standard power range started at 1840 RPM for the 6600 and 1660 RPM for the 6800. In terms of torque characteristics, the six-cylinder engines were among the best of their time.

The PermaClutch clutch was a 3-disc type. The lifting capacity was significantly higher than that of the 4-cylinder models: 6177 and 6840 kg. The 6600 featured the transmission familiar from smaller models with 24+16 (later 24+24) gears, while the 6800 had a sturdier 20+12 transmission. Both had a 4-speed PowrQuad quick shift and a hydraulic reverser. The 6800 also had more powerful brakes. The front tires were quite large, but thanks to the front wheels that could turn 52 degrees, the turning radius was reasonable.

In 1994, the range was expanded with the 6900 (130 hp), which was technically very close to the 6800. The tires and fuel tank were larger. The torque increase percentage of the 6900 was an impressive 38%. In 1995, a naturally aspirated 6-cylinder model, the 6506 (105 hp), was introduced. Its technology mostly corresponded to the 6400 model.

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