Specialized isodiametric tractors are so named because they have all wheels of the same diameter or very close diameters. What sets them apart from traditional tractors are their shorter wheelbases, making them highly maneuverable, and a more balanced weight distribution when carrying equipment. This is because the engine’s overhang relative to the front axle balances the weight of the equipment carried over the rear axle. When the equipment is in contact with the ground, the overhanging engine eliminates or greatly reduces the need to weight the front end with ballast. The result is agile and relatively lightweight machines, excellent for specialized agricultural tasks or operating on sloping terrain.
In such contexts, isodiametric tractors demonstrate superior stability compared to traditional tractors, thanks to their lower centers of gravity, which still allow for adequate ground clearance. However, as the saying goes, “there’s no rose without thorns,” and in the case of isodiametric tractors, the thorns are their traction capability and lift capacity. Due to the diameters of the rear wheels, these parameters are inferior to those of traditional tractors, limiting their use for demanding land preparation tasks.
To overcome this limitation, Ferrari has developed a range of tractors with larger rear wheels under the “Stellar” name. These models maintain Ferrari’s design philosophy for isodiametric tractors but offer a rear lift with higher load capacity and improved traction for handling high pulling efforts.
Named “Stellar,” equipped with a 75 horsepower engine provided by a Kohler unit, the Kdi 2504 Tcr,the “Stellar” tractors feature rear wheels that can reach up to 24 inches in radius, compared to the 18 or 20 inches of the Ferrari “Thor” series isodiametric tractors. The “Stellar” tractors inherit much of their mechanics from the “Thor” series, including mechanical and synchronized transmissions with 16+16 gears controlled by hydraulic multi-disc clutches and the ability to engage or disengage four-wheel drive via electro-hydraulic means.
Ferrari “Stellar 85 Rs”: Top comfort
Also carried over from the “Thor” series are the uni-directional and pedal-operated driver seats, isolating the operator from the chassis and reducing mechanical vibrations and noise. However, the “Stellar” tractors boast improved three-point hitch capacities, with 27 quintals compared to the 24 of the “Thor” series, without negatively impacting energy consumption. Hydraulic capacities remain unchanged, thanks to dual-circuit hydraulic systems with independent pumps capable of delivering up to 33+51 liters/minute compared to the standard 33+30. This ensures no issues in powering up to seven hydraulic outlets, all controlled via mechanical levers conveniently located on the right fender for ergonomic operation.
In the same area, controls for engaging the power take-off (PTO) are positioned, featuring Ferrari’s traditional oil-bath clutch for durability. The gearshift lever is placed in a forward position, allowing easy access to the driver’s seat without needing to navigate steep tunnels, particularly beneficial when equipping the tractor with the optional ultra-low “Compact Pro” cabin, which measures just 170 centimeters from the ground and is Class 4 certified. The cabin is equipped with active filters to prevent dust, liquid, or gaseous infiltration, and a built-in air conditioning system maintains a positive pressure compared to the outside environment, operating automatically.
Compact yet capable of accommodating even larger operators comfortably, the cabin features a suspended seat with breathable fabric instead of the waterproof material found in open versions. These open versions are designed to access low-height crops with a maximum height of 120 centimeters by lowering the safety arches. Designed this way, the Ferrari “Stellar 85 Rs” tractors prove to be highly versatile, with the option to further customize their use with available accessories from the manufacturer. Notable among these are the “Self Cleaning System,” which reverses the fan’s cooling flow to clean the hood vents, rear lift force control, and hydraulic control of the rear lift’s third point, particularly useful for maintaining precise working configurations for carried equipment.
Title: Ferrari “Stellar 85 Rs”, strong and stable tractor
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