At Agritechnica in the autumn of 2015, the first 6-cylinder Zetors were presented for the first time in a long while. The technology had only minor differences compared to the Forterra models, but the model name chosen was the traditional Crystal, and the hood design was more massive. The engines were 6.1-liter Deutz units. The torque increase was a top-level 38%. The emission technology included urea injection, common rail, and a viscous fan. The transmission was an in-house produced 30+30 with a three-stage power shift and power shift automation. The lifting capacity was the same 8.5 tons as in the Forterra HD. The front axle was a separate-sprung Carraro with 25 grease nipples to be lubricated every 100 hours. Cab suspension was also standard. The noise level was 73 dB. The controls were somewhat more basic than usual for tractors of this size, and there was no control armrest like on the Forterra HD.

In autumn 2018, the HD models received Stage 5 engines as well as updated instrument panels, controls, and seats. The 40 km/h speed was now reached at 1750 rpm instead of rated engine speed.

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