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In the smaller end of the John Deere 6R series, engines equipped with urea injection were introduced in the fall of 2015. Both the model numbers and the rated power increased by five steps. In the three larger models, there was significantly more additional power than before. The four-cylinder engines featured twin turbos, of which the high-pressure turbo operating at higher rpm had a variable geometry. The stated weights of the tractors were 600-1000 kg greater than previously, meaning that compared to the nearly 10-year-old 6430 Premium, the 6120R was 1350 kg heavier.

The basic transmission was the PowerQuad Plus with a four-speed powershift, which had a quick-shift adaptation when changing the range gear. The number of gears in four-cylinder models was 24+24 and in six-cylinder models 20+20. The quick shift automation was available in the AutoQuad Plus version, which was also available in a 50 km/h or 40 km/h Eco version. All models could also be equipped with the stepless AutoPowr transmission, which also included a pedal-drive mode. Starting from the 6145R, a DirectDrive dual-clutch transmission was offered, combining two mechanical gearboxes, each with its own clutch. One handled the even gears, and the other the odd gears. The load on the drivetrain controlled the shift to the next gear. The transmission had three ranges, each with eight quick shifts. The transmission could be operated automatically or manually. The transmission offered good efficiency but did not provide the jerk-free driving experience of a stepless transmission.

The load-sensing hydraulic output was standard at 80 liters, but in Finland, a 114-liter pump was standard. The lifting capacity in the 6110R and 6145R was increased. The noise level was reduced by one decibel to 71. The CommandArm console had been renewed.

At the beginning of 2019, the CommandPRO control lever was introduced, featuring 11 freely programmable buttons.

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