In autumn 2012 the Arions were updated to the T4i stage. The styling of the hood became more striking, and the cheaper C-model was dropped from the range altogether. The lineup shifted upward by roughly twenty horsepower on average. The engines were from John Deere’s PVX series. There was no urea injection, but every other known emissions-control technology was employed.

The six-speed Hexashift Powershift transmission (with creeper gearbox) was offered in three versions: Super Eco 40 (1,650 rpm), Eco 40 (2,000 rpm) and Eco 50 (2,000 rpm). Load-sensing hydraulics with a 110 l/min pump became standard even on the smaller models. The PTO came standard with four speed settings. Published turning-circle diameters increased compared with earlier versions, and the front axle continued to be manufactured by Carraro.

The cab was redesigned with five posts—meaning the right-hand B-pillar was eliminated. On the CEBIS-equipped versions, the 21 cm display and the control joystick were repositioned and updated. CEBIS features included headland automation and memorized cruise-speed settings. The cab was always fitted with helical-spring suspension, and on the 650 model front-axle suspension was standard.

For 2014 Claas introduced a stepless Cmatic driveline. On the Axion models the transmission—replacing ZF units—was developed and built in-house by Claas, based on multi-plate clutches. A top speed of 50 km/h was reached at just 1,500 rpm.

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