For the 1991 model year, power was increased to 100/110/120 horsepower. The engines on these models were equipped with a viscous fan and a new type of injection system. Engagement of the four-wheel drive, the PTO and the differential lock was electro-hydraulic and monitored by an onboard computer. The features also included automatic differential-lock control and the option to disengage the four-wheel drive when the front wheels were turned more than 25 degrees. The three-point hitch gained a new oscillation-damping function. Hydraulic flow was increased to 75 liters per minute, and the lifting capacity of the 312 model was raised to 5,800 kilograms. The front axle of the 312 now featured a multi-plate differential lock.

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