The T4 series, introduced in the fall of 2014, was Valtra's most significant innovation in over 20 years. The design was striking and the cab was new. Of the six models, the two smallest had 6.6-liter engines, and the larger ones had 7.4-liter engines. The 174e was Valtra’s traditional low-rev model, where with the Eco program the maximum torque was achieved at 1100 rpm and the nominal engine speed was 1900. To meet Stage 4 emission standards, urea was now used as 6–7% of the fuel volume. Therefore, a particulate filter was not required, but an oxidation catalyst was used. Additional power could be drawn from the engines for the power take-off (PTO).

The engine was positioned further back than before, and the wheelbase was 25 cm longer. The wheels turned more, reducing the turning radius compared to its predecessor. The cab had five pillars and the entrance was made more spacious. From fall 2015 onwards, an optional door was also available on the right side, increasing the number of pillars to six. The noise level was stated to be 70 dB. As an option, mechanical or pneumatic cab suspension was available.

There were now four equipment versions. The Hitech, Active, and Versu models all featured a 5-speed quick-shift gearbox with shift automation and an electric range shift. The Active and Versu models included a hill hold assist that allowed the tractor to be stopped using the brakes alone and set in motion by releasing the brake and pressing the throttle. In these models, the engine speed was also automatically raised when using the hydraulics without affecting driving speed. The Hitech had a traditional gear pump in the hydraulics (73 or 90 l/min). Other models featured a load-sensing system (115/160 l/min) and separate hydraulic and transmission oils. The Versu and Direct models had electronic control of the hydraulic valves, an armrest control unit, and a display. The Direct model featured Valtra’s own stepless transmission.

In the summer of 2017, the T254 with a maximum power output of 271 horsepower was introduced, as well as a new more versatile programmable SmartTouch display/armrest for the Versu and Direct models. The T254 had a second power boost stage, which was active in the three highest gears and, in the Direct model, at speeds above 38 km/h. At the same time, a 57 km/h speed option was made available for the 7.4-liter models. Also new at this point was the Direct transmission for the T234 model, though its power and torque were limited compared to other T234 versions.

The transition to LFTN-D5 engines meeting the fivefold emission standard took place at the beginning of 2019.

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