John Deere F8 400
Source-backed specifications and current market configuration for this self-propelled forage harvester.
Specification set: United States · Current F8/F9 US specification Current John Deere F8/F9 data captured 2026-08-31. Individual-page rated/max power and family-table HarvestMotion metrics are deliberately stored under different spec keys when the published values differ.
Machine Configuration
Machine configurationSelf-propelled forage harvester
Official market scopeUnited States current F8/F9 catalog
Engine
Engine modelJohn Deere JD14X 6136
Engine displacement13.6 L
Cylinders6
Engine / turbo configurationSingle-stage turbocharger (SST)
Rated engine power (individual product page)537 hp
ECO mode power459 hp
Harvesting System
Harvest automationProTouch Harvest and Ground Speed Automation available in the current F8/F9 platform
Header Connection
Maize header options14.8, 19.7, 24.6, or 29.5 ft maize header working widths; 6, 8, 10, or 12 rows
Grass pickup options9.84, 11.45, 13.12, 14.76, or 15.09 ft grass pickup transport widths
Kernel Processing
Kernel processor optionsJohn Deere Ultimate250 KP or XStream305 KP
Capacities
Fuel tank capacity290 gal
DEF tank capacity39.9 gal
Sources
Specifications on this page are tied to the cited source records and the selected market/configuration version.