For the year 2018, the flagship model of the lineup introduced was the K-743, which replaced the previous K-744 R. The engine was still Mercedes' 10.7-liter, but now met the stage IV final emissions standard. The power had increased to 435 horsepower. The transmission was a new T5 quick-shift automatic. The range shift operated pneumatically. Load-sensing hydraulics were supplied by Bosch Rexroth. There were four hydraulic blocks. The new T400 axle was reported to be 27% stronger than before, and the brakes had been changed to disc brakes. The lifting capacity was now stated as 5500 kg at a standard distance of 610 mm.

The cab was updated to Comfort Plus. The noise level remained at 75 dB. Despite the purchased components, Kirovets stated that 70% of the tractor’s parts were of its own manufacture.

Outside Western Europe, the series also included many other models with YaMZ, Tutaevsky, and Mercedes engines in lower emissions classes. The last two digits of the model number indicated the maximum power. In 2020, a shorter wheelbase K-525 was also introduced, whose 250-horsepower YaMZ engine met the stage IIIa emissions standard.

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