The new engines meet the required emission standards but retain the key features present since the series launch.
The upgraded FT4 engines are new to the 800M-Series tracked feller bunchers and 800MH-Series tracked harvesters. Some of the highlights of these machines include spacious and more comfortable cabs equipped with ergonomically designed controls, fully adjustable armrests and an air-conditioned seat. Floor-to-ceiling front and side windows plus an overhead skylight provide operators with good views of the harvesting area.
The machines have the same undercarriage and boom as the 900M- and 900MH-Series machines. The 800M and 800MH machines have a stronger boom and bigger pins and bushings. When configured as a harvester, it has through-nose harvester head plumbing options to extend hose life, an optional undercarriage-mounted toolbox for convenient storage, and an increase in fuel tank size on the 800M by 50 percent, extending intervals between fill-ups. Source: http://www.deere.com/en_US/corporate/our_company/news_and_media/news_and_media.page