Most of the 6-cylinder Agrotrons were upgraded to the M series in the autumn of 2007. The engines had been replaced with 6.1-liter Deutz engines featuring common rail injection. The two most powerful models also had four-valve technology. The torque ratings of the 2-valve models were not very high. Depending on the model, the stated maximum torque was available from just over a thousand RPM up to 1700 RPM. The engines could run on 100% biodiesel. The transmission was still the 24+24-speed ZF 7200 with a four-stage powershift. Automatic functions were offered only in the Profiline version. The standard hydraulics were based on a conventional gear pump, while the Profiline models had a 120 l/min load-sensing hydraulics system with electronic valves.

Both axles had engageable and automatically disengaging 100% locks. The most powerful model, the 650, also had disc brakes on the front axle. The front axle suspension on the 50 km/h version was hydropneumatic. The cab was optionally available with either mechanical or pneumatic suspension for an additional cost. The noise level inside the cab was 73-74 dB. Models 600 and 610 differed only in power and tire size; in the larger models, additional robustness was added to both the front axle and the rear.

For some markets, such as Spain, models M 600, M 620, and M 650 were still produced as late as 2016. However, the appearance had changed to resemble the 6100 series, and the M 600 also featured an additional power function.

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