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John Deere’s monster 9-series to top out at 691hp >More in © John Deere John Deere has given its huge 9R, 9RX and 9RT tractors a long-awaited birthday, with improvements including more power and an updated cab. For the biggest wheeled 9R and four-track 9RX 640 models, Deere has stuck with the 15-litre Cummins engine that now maxes out at a whopping 691hp.  The rest of those ranges get the firm’s own six-cylinder, 13.5-litre Powertech block, which was used in roughly half of the outgoing models but now packs an extra 20hp and is apparently 50% quieter. There’s been no change to the power ratings or model numberings for the trio of twin-track RTs, led by the biggest 9RT 570. This develops 627hp, leaving it some way shy of Fendt’s rebranded 673hp 1167 MT Vario in the power stakes.

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