At the beginning of 1991, the first models of the Mezzo series were introduced: the three-cylinder 6100 (79 hp) and the four-cylinder 6300 (85 hp), 6400 (95 hp), and 6600 (105 hp). The basic structure was similar to the 05 series: the engine was located above the front axle, and the fuel tank positioned between the engine and gearbox served as part of the load-bearing structure. The engines were the new 20 series. The transmission had a reverser with 12+12 speeds and, as an optional accessory, a Volvo BM quick shift offering 24+24 speeds. The transmission now also featured low gears, and whining noise was eliminated thanks to helical gears. A hydraulic clutch was available as an option, chosen by nearly half of Mezzo buyers. The 6400 had a heavier-duty differential compared to the smaller models.

The cab was manufactured by Maaseudun Kone and was quite spacious inside. The noise level was average at 78 decibels. The seat could rotate 180 degrees, and as an option, Twin Trac rear steering controls were available. The electric hydraulic control (Autocontrol) was standard on all models. The Sige front axle was agile, and four-wheel drive engaged automatically when braking. The Mezzo’s overall dimensions were relatively large compared to their power output.

In the summer of 1993, the optional 2-speed quick shift was replaced by a 3-speed Delta Powershift, and a naturally aspirated four-cylinder 6000 (75 hp) was introduced. Production of the 6100 ended shortly afterward, and the 6000 was only in production for a couple of years.

In spring 1994, Autocontrol II became standard equipment, featuring automatic differential lock activation and an added stop position to the raise-lower switch. At the same time, the 6400’s turbo with a wastegate improved torque characteristics. Unlike the other Mezzos’ increase of roughly 20%, the torque rose by 31%. A year later, the Valmet logo on the side panels was replaced by the Sisu logo.

The most popular models became the 6300 and 6400. At the beginning of 1997, the lineup was expanded with the 80-horsepower 6200, equipped with a distributor pump. At the same time, the HiShift button clutch became an optional feature. Autocontrol was updated to version 2.1, which included a so-called forced lowering function. In 1998, the digital Autocontrol B with oscillation damping became standard.

At the end of 2000, the inline pump on the 6400 was replaced with a distributor pump that provided a quieter running noise and better torque at low RPMs. Power output increased to 100 horsepower, and the engine shut-off was controlled by the ignition key. At the same time, the rear axle was changed to one used in larger models, and lifting capacity increased to 5.6 tons. The 6300 received the same updates in summer 2001 and, after a brief hiatus, returned to the Finnish market as a 90-horsepower model.

In summer 2003, due to new emission regulations, Fortius engines were introduced. The 6400’s ET engine featured an electric pump, while the 6200 and 6300 still had mechanical pumps. Power figures were now given according to the ISO 14396 standard, excluding the fan.

The brand name changed to Valtra Valmet at the beginning of 1998 and to Valtra from 2001 onward.

This is an automated translation. Please report any issues in the translation.