A recent edition of the American Farm Progress magazine reported on the launch of two new John Deere tractor models that can supply electrical power to drive implements. Joe Spencer explains the implications of this technological breakthrough.
John Deere introduced the new 30 Series tractors at a launch in Warsaw in September 2006 and the Mannheim manufacturing facility has now announced the 7430E and 7530E Premium models incorporating a 20kW AC generator in place of the flywheel. This development won the company a gold medal for innovation at the recent Agritechnica Show in Hanover. The generator will supply the power for reversible cooling fans, which can clear the chaff and dust from radiators, while airconditioner compressors, coolant pumps and other systems will also be electrically powered.
Initially the project was designed to develop a more efficient tractor, but Deere’s engineers are looking to use excess AC power to drive implements like sprayers, spreaders, compressors and fans on air seeders. Internal company tests have shown fuel savings of 3% to 5% as well as a 7,5kW boost to PTO ratings. This is when compared to normal 135kW and 150kW 7430 and 7530 tractors without the “E” power management system. This may seem a small improvement, but it becomes important when viewed against the ever-increasing cost of diesel. Ten of the E Premium models will be built for testing during 2008 and the units will go into full production by early 2009. crankshaft-driven generator provides 12V at 300A and two outlets are provided at the tractor rear, one rated at 230 VAC, 50Hz, 16A and the other 400 VAC, 50Hz, 9A.
The engine accessories don’t require all the power, so the excess can be used for tools and implements. Electrical systems are of particular importance for the European market where high-pressure hydraulics and revolving components such as PTO drive shafts are increasingly coming under the scrutiny of health and safety officials and safety activists. The system has advantages for other countries too, because of the reduction in maintenance requirements, less heat generation and savings in weight. The new management system results in a quicker warm-up of a cold engine as the infinitely variable fan only runs when necessary. In addition, the airconditioner fan can run at maximum speed even when the engine is running at just over idling speed. When these tractors are used for road haulage, the system runs the air brake compressor only when the pressure falls below the minimum level.
