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For the year 2025, the JD 6M series introduced "Small frame" four-cylinder models equipped with a 4.5-liter PSS engine featuring both variable geometry and fixed geometry turbochargers in series with EGR. The models with a "medium frame" were equipped with a 6-cylinder PVS engine with a single variable geometry turbocharger. All models had a particulate filter, oxidation catalyst, and urea injection. Additional power of 20 hp was available in PTO use and at highway speeds. The highest power models of both frame sizes were available only with the stepless AutoPowr transmission. The four-cylinder models equipped with a traditional transmission had 24+24 gears with a 4-speed splitter, and the 6-cylinder models, as before, had 20+20 gears.

The load-sensing hydraulic system's output was 114…155 l/min. The 130 and 140 models came standard with an 80 l/min pressure-compensated system. Up to three electronic hydraulic valves were available as an option, and up to four valve blocks could be installed at the rear.

The 6MH 155 was a special version equipped with a high ground clearance of 760 mm, featuring 320/90R50 wheels at both front and rear and a maximum speed of 30 km/h. The 6-cylinder models had an additional weight of over one ton compared to their predecessors.

The cab was simpler from the frame outward than the 6R models, but the noise level was only 70 dB. The instrument cluster was located on the front pillar. Optional equipment for the 6M included a control armrest, a 10.1" or 12.8" display, automatic steering, block automation, mechanical cab suspension, hydropneumatic front suspension, and a trailer brake valve.

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