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In the autumn of 2005, the Agrotron K models were introduced, gradually replacing the smallest MK3 models. The K models were cheaper than their predecessors. They featured a new, smaller cab and the hydraulic output had been reduced to 55 liters. Alongside the basic models, there were Profiline models, which had powershift automation, 83 l/min load-sensing hydraulics with a separate oil supply, four electronically controlled hydraulic valves, and versatile headland management automation. The Profiline hydraulic valves were operated with the buttons on the joystick. In Germany, a cheaper Power package was also available compared to the Profiline, which included, for example, a 75 l/min open hydraulic system, automatic differential lock, and air conditioning.

The engines were the same electronically controlled, water-cooled Deutz engines as in the previous models. The largest model of the series was the new 4-cylinder K120. The transmission was a ZF 24+8 with a three-stage powershift. The 40 km/h speed was achieved by limiting the maximum rpm in top gear to 2000 rpm. Unlike before, the front axle was from Carraro. Front axle suspension and a 50 km/h driving speed were available as options. The front axle had as standard a 45% lock and a 100% lock as an option. The cab followed the same design solutions as previous Agrotrons. The noise level was stated to be 72 dB. Cab suspension was available as an option.

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