In the autumn of 2008, the MF 8400 series was updated to the 8600 series. In marketing, the main focus was on the largest model of the range, the 8690, which at that time was the most powerful fixed-frame tractor on the market. The maximum power of the 8690 was 370 hp.

The engines of all models were 8.4 liters. In fact, the smallest model, the 8650, had similar power output to the third smallest model of the previous series, the 8470. The 8690 featured a new SCR system, i.e., urea injection, which was intended to reduce fuel consumption despite emission limits. The AdBlue tank was filled approximately every other refueling. The stepless Dyna VT transmission included the Dynamic Tractor Management system, which corresponded to Fendt's TMS. The transmission control, however, differed from Fendt's. Driving speed could be adjusted with the lever on the left side, the joystick on the armrest, or the speed pedal.

Hydraulic flow was increased to 175 liters per minute and lifting capacity to 12 tons. The front axle was the new Dana 770 series. As an option, there was SpeedSteer, which allowed the steering to be adjusted to be faster than normal at speeds under 18 km/h.

The four-post cab was new and 28% more spacious than before. The interior color was changed to light beige. Most of the controls were centralized on the armrest. Cab suspension was standard, while front axle suspension was only available on the 50 km/h version. In Finland, the OptiRide Plus cab suspension—adjusting based on acceleration sensor measurements—and heated mirrors were standard features.

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