This series has eco-friendly diesel engines that are built by Branson. They are Tier 4 certified. No intervention or cycling is required from the operator and the operations is fully automatic while the engine is running. An electronic data logger monitors the system, but does not effect the engine’s fuel injection pump. There is no aluminum, pot metal or brittle metal blends used in the casting of the power train and frame—it’s all CAST IRON. The hoods and fenders are steel with a powder-coated paint finished. The main frame is wide, heavy and reinforced to prevent distortion in rough terrain and heavy duty load applications. These tractors are built to last! Branson’s 4WD axle provides a lock to lock steering angle of 57º with 10º of camber. Since no drag link is used, a smooth, easy and tight turn is achieved. It also reduces front tire wear. Power to the front axel is engaged or dis - engaged with a small lever. We recommend disengaging the front axle for road use. The 15 Series tractors use an independent, wet hydraulic, multi disc clutch PTO system. The tractor does not have to be stopped to engage the PTO. Two PTO speed modes are available. A lever allows selection between 540 and 540E. Branson’s new HYDRO-MAX transmission is standard on all 15 series HST models. With HYDRO-MAX you no longer have to pre-set an engine throttle position The engine rpm automatically increases or decreases as you move the forward/reverse foot pedals. The 15 series comes with either the SL15 loader with a lift capacity of 1,835 lbs. or the BL15 loader with a lift capacity of 2,090 lbs. Best is class weight of 4,529 lbs. 35 & 40 HP Branson Protection Plus 6 Year Powertrain Warranty.