8030 Series Tractors : Engine

Owners of row-crop tractors have high expectations for fuel economy and field performance. John Deere research and development has engineered an engine that has met these customer requirements and met stringent emission regulations. With the PowerTech Plus™ 9.0 litre engine you can expect superior performance in any application. These engines deliver proven operation, with countless hours of laboratory and in-field usage to verify it can carry the John Deere name.

For excellent economy and load response, a Variable Geometry Turbocharger (VGT) is used on all models. The “variable” part of the turbo provides performance by electronically positioning exhaust airflow vanes. The external actuator has a mechanical linkage to move the vanes to the appropriate position.

The VGT provides these overall benefits:

• Increase low-speed torque
• Quicker response to load
• Increase peak torque
• Improved fuel economy
• Improve performance at high altitudes

This patented fan drive system replaces the viscous and vistronic systems used in prior 8000 Series tractors. The cooling fan and how it is driven is very important to control precisely because it takes horsepower to move air across the coolers and radiator.

The Vari-Cool™ system gains in efficiency are coming from two main elements:

• A belt replaces the viscous clutch where there is always some “slippage”. The belt drive used in Vari-Cool™, transfers almost 100% of the power.
• The fan rpm can be controlled to the exact speed required for the operating conditions. The fan speed can be controlled exactly to the rpm that is required to cool the water from engine, hydraulic oil, and assure good air conditioning operation.