CLAAS has announced that the success with a prototype model, means that its rear-tracked tractor, the Axion 900 Terra Trac will go in to full production.

Launched at this week’s Agritechnica, two TT models will be available – the 445hp Axion 960 and the 355hp 930. These will be the first half-track tractors on the market to have a fully suspended track system and the system, developed by Claas specifically for the Axion utilises the company’s wide experience gained over 30 years of rubber track development for the Lexion combine.

To meet the specific power transfer needs of a tractor and to handle high levels of torque, the drive wheel on the tractor version unit is larger than that on the Lexion and has spokes with attached rubber blocks to aid self-cleaning.

The tracks use a force-locking drive and are maintained at a higher tension for even pressure distribution.

Claas also hope this will be a comfy ride for operators, as the half-track’s full suspension, combined with a front axle and four-point cab suspension will not only aid ground contact and reduce wheelslip, but give comfort levels not seen before.

Drive is through a standard CMatic transmission, but with housings changed to bridge the differences in height and length. The actual drive is through a cardan shaft between the pto and the Terra Trac intake shaft.

Tracks are available in widths of 635mm, 735mm and 890mm and all have transport widths similar to tyres and below 3m in total machine width. The footprint on the widest 890mm track is 3.87m2, which is 35% larger compared to a 900/60 R42 tyre. As a result, tractive power is 15% greater and ground pressure is reduced by 50% and, to avoid scuffing when turning, the TTs feature a unique intelligent steering system which aim to give similar driving characteristics to a wheeled tractor.

There’s also ride height control, with low, medium or upper positions for the tracks.