In the autumn of 1998, the Valtra Valmet HiTech range was introduced, based on the Mezzo and Mega series. The four-cylinder models were 6550, 6650, and 6850. The engines were new E-versions, with lower emissions and more torque than before (torque increase of 35%, 31%, and 28%, respectively). The engines featured a viscous fan that only operated as needed, and the 6850 had a new intercooler. Fuel delivery was handled by a distributor pump.

The transmission was fundamentally an outdated Delta Powershift compared to competitors, but now integrated with computerized controls. With automation, two automatic quick-shift programs could be programmed: one for field work and one for road use. The direction reverser was based on two wet multi-plate clutches. The reverse acceleration could be set to be faster or slower than the forward driving speed. The engagement of the quick shift was smoother than in the standard model, thanks to sensors and automation. The power take-off engagement was also controlled by a computer.

The cab was 30 mm higher than that of the Mezzos. Sound insulation was improved from earlier models. The direction reverser lever was located to the left on the environment lever. The clutch pedal was electrically operated, and additionally, a button clutch was standard on the shift lever knobs. The display on the right front pillar showed the quick shift step, selected direction, driving speed, and outside temperature. The rear linkage was an Autocontrol D with oscillation damping. The lifting capacity was greater in the 6850 and later also in the 6650 compared to the Mezzo (6600 kg).

In the autumn of 2000, the HiTech 2.0 models were introduced. The automatic programs were updated. The most significant improvement was the user’s ability to adjust the shift automation RPM thresholds to suit specific tasks. Four-wheel drive now engaged for a few seconds whenever starting off or changing direction. If desired, starting off could be done simply by pressing the accelerator after activating Auto Traction, and stopping by releasing the accelerator or braking. The lifting capacity increased to 7 tons in the 6650 and 6850. Air-suspended front axle was now also available for the four-cylinder HiTech models.

In 2001, a low-rpm model 6750 was introduced, delivering 105 hp at 1800 rpm. Advantages included lower consumption, reduced noise levels, and a 500-hour oil change interval. Unlike other HiTech models, the low-rpm version was not available with a 50 km/h transmission.

In 2003, the range shifted to Fortius engines. The new models were 6350 (101 hp), 6550 (105 hp), and 6850 (125 hp). The engines were the same as those in the Mezzo series, with the 6350 still equipped with a mechanical injection pump. Lifting capacities also decreased to the same level as the Mezzos.

Close relatives of the HiTech models were the articulated X models. Agri and City versions were available, with the latter equipped with a fixed industrial front loader. The X models had a wheelbase 32 cm longer than the base models, and the Agri version weighed 600 kg more than the HiTech. The articulated joint was installed by Junkkari Oy in Ylihärmä.

X 100/110/120 Agri: like the 6550/6650/6850 except maximum speed of 38 km/h, tires 420/70R28 and 520/70R38, fuel tank 135 liters, height 282 cm, length 483 cm, wheelbase 265 cm, weight 5450-5460 kg, turning radius 9.06 m.

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