John Deere announces new smarter 9R Series range 4 March 2021 | The new series comes with increased connectivity and automation features John Deere has announced its new smarter 9R Series tractor range, headed by the 691hp flagship models 9R 640 and 9RX 640. The latest 9R, 9RT and 9RX machines have not only been made stronger and more efficient, but also more intelligent. Operators and farm managers are set to benefit from their increasing connectivity and automation features. All the tractors use the same new 13.6-litre John Deere engine as the X9 combines, except for the top of the range 640hp models which are still powered by the 15-litre Cummins engine.