Craig Rupp, CEO of Sabanto, is no stranger to the world of autonomous farming. As a pioneer in the field, Rupp has been at the forefront of operating a fleet of autonomous tractors, providing him with unique insights into the practical realities of autonomy in agriculture. In a series of bi-weekly opinion pieces, Rupp delves into the intricacies of autonomous farming, offering farmers a glimpse into what this technology could mean for their operations today.
One of the most compelling aspects of Rupp’s perspective is his hands-on experience with retrofitting tractors for autonomy. Sabanto has successfully retrofitted over 20 tractor models from six different original equipment manufacturers (OEMs), ranging from sub-60 horsepower to over 400 horsepower. This extensive experience has given Rupp and his team a deep understanding of what works and what doesn’t when it comes to autonomy.
Rupp emphasizes that not all tractors are created equal when it comes to retrofitting for autonomy. The key components that determine a tractor’s suitability for autonomy are the transmission, brakes, and steering. Manual transmissions, for instance, are a significant hurdle due to the complexity of controlling the clutch and gearshift. In contrast, electronic shuttle transmissions and infinitely variable transmissions (IVTs) offer a smoother path to autonomy.
Brakes are another critical consideration. Rupp highlights that tractors with conventional hydraulic brakes require more invasive modifications, such as using electromechanical actuators. However, tractors equipped with air brakes, like those from Fendt, offer a simpler and more effective solution. By regulating air pressure with an electrically controlled air valve, Sabanto can achieve smooth and reliable braking without extensive modifications.
Steering is the final piece of the autonomy puzzle. Rupp explains that tractors with auto-steer capabilities are ideal, but for those without, off-the-shelf hydraulic valves or steering wheel motors can be used. Each solution has its pros and cons, with hydraulic systems offering smoother adjustments but requiring more complex installation, and steering wheel motors providing variable adjustments but potentially lacking longevity.
When it comes to the debate between new and used tractors, Rupp offers a pragmatic view. While OEMs may push for the purchase of new, “autonomous-ready” tractors, Rupp argues that for many farmers, the practicality and long-term value of used tractors make them a more attractive option. Used tractors often have proven reliability, are already matched to the farmer’s implements and field conditions, and can leverage existing capital investments. Additionally, the market for low-hour used tractors provides farmers with cost-effective alternatives to new purchases.
Rupp’s insights underscore the importance of choosing the right platform for a seamless retrofit. Farmers who upgrade their existing tractors can avoid unnecessary costs, maximize the value of their current equipment, and benefit from the increased efficiency and productivity that autonomy offers. As Rupp puts it, autonomy isn’t about replacing tractors—it’s about making them smarter.