High-Performance Mower Conditioner BiG M 450

The engine

6-cylinder, 449 hp LIEBHERR engine, Emission Stage IV
Large 1,500-hour service intervals
Extremely fuel-efficient thanks to PowerSplit engine control
Automatic load limit control for maximum efficiency
Mounted on silent blocks and therefore quiet running
Large radiator with passive rotor for optimum temperature control

The 449 hp LIEBHERR engine features automatic engine control which tailors the output to the current load on the mowers. Consequently, BiG M 450 will use less fuel in lower- yield crops. A new load limit control system monitors the engine speed and reduces the ground speed when engine speed is very low. Mounted on silent blocks, the engine runs very quietly in all situations.

The LIEBHERR engine that powers the BiG M 450 is Emission Stage IV compliant and uses SCR technology (Selective Catalytic Reduction) to achieve clean combustion. The technology injects urea into the exhaust stream upstream of the catalyst which converts the nitrogen oxides that develop during the combustion process into natural nitrogen and water. The fuel tank holds 780 litres and the urea tank 80 litres to last through long working days without the need for topping up.

The KRONE PowerSplit engine control monitors the engine speed. In Eco mode, the engine starts off at 1,650 rpm and puts out 354 hp. It changes into M mode when a higher output is detected. The output in M mode is 449 hp. Load limit control kicks in when engine speed droop is excessive. It automatically adjusts the output, which substantially reduces consumption.

A new top-speed control system allows operators to make even more efficient use of their machine. The system reduces the ground speed automatically as soon as the engine is revving within a specific range and thereby ensures the cut is always perfect.

Mounting the engine centrally between the rear and front axle brings a number of benefits: short drivelines to the mowers, an ideal 64% : 36% front : rear weight distribution and a low centre of gravity.