John Deere 8400 Self-Propelled Forage Harvester

  • 532 hp FT4 John Deere engine.
  • All-new design delivers improved serviceability with an integrated KP hoist, easy header hook-up and ground level fuel fill.
  • A best-in-class cab offers easier to use controls, better display access and visibility.


+ Optimal design and positioning of components increases crop delivery performance

+ ProDrive™ coupled with large tires boost performance and uptime in soft conditions

+ Heavier designed components increase reliability while improving uptime and lowering cost of operation

+ Best-in-class power efficiency delivers unmatched performance in the field

+ Advanced comfort and serviceability improve performance and uptime

+ Maximize animal performance through forage quality

Engine power

Maximum power at 1800 rpm397 kW
540 PS / 532 hp
Maximum power at 1900 rpm
Rated power at 2100 rpm369 kW
502 PS / 495 hp
Fuel tank capacity1100 L
290.6 U.S. gal.


ManufacturerJohn Deere
TypePowerTech? PSS 13.5L
Exhaust emission regulation compliancy - Final Tier 4
ModelEurope: 6135HZ014
North America: 6135HZ013
Displacement13.5 L
823.8 cu in.
CylindersIn line six
Fuel systemUnit injectors plus four valves

Cooling system

Cooling system capacity113 L
29.85 U.S. gal.
Cooling fan driveDirect


Ground driveStandard: Hydrostatic, 3-speed - manual shift with helical gears
Engine rpm on road: 1650 rpm
Optional: Prodrive?, autoshift transmission, differential lock (automatic and manual), automatic wet brake system
Engine rpm on road: 1140-2100 rpm
HydraulicsLoad sensing
Crop harvesting unitHarvest channel standard
Crop flow componentsLow-friction crop-flow concept
Main clutchDry clutch
Number of discsOne disc
Main drivebandReinforced with Kevlar inserts
Belt tensioningActive, hydraulic pressure
Main driveband, polybelt beltsSix belts

Electrical system/Electrical and hydraulic system

Type/voltage12 V
Batteries/battery quantity/capacity2 x 174 amp-hr
Alternator200 amp
Hydraulic system capacity50 L
13.2 U.S. gal.

Ground drive

TypeStandard: hydrostatic, 3-speed manual shift
Optional: Prodrive?, autoshift transmission
Differential lockManual or automatic (optional comes with ProDrive)
Maximum transport speedHydrostatic transmission: 30 km/h
18.6 mph
ProDrive transmission: 40 km/h
24.9 mph
Rear axle typeHydro-mechanical 4WD
Automatic wet brake systemAvailable with ProDrive transmission
Engine rpm - ManagementOptional


Tilt and extend steering columnStandard
Air conditioning and heaterStandard - ClimaTrak
Cool boxOptional
Trainee seatStandard
Hectare counterStandard
Operator information systemCornerpost display
CAN-BUS electronicsStandard
Operator's seatAir-suspension seat standard
Side window wiperRear and side window wiper optional
Parallel-type windscreen wiper
Electric adjust and heatedOptional on rear view mirrors
Rear view mirrorsStandard

Machine management solutions

Yield monitoringHarvest Monitor? optional
DocumentationHarvest Doc? optional
Crop analysisHarvestLab? optional
Length-of-cut control based on crop parameterInfinitely variable length-of-cut (IVLOC?) standard
AutoLOC? optional - use with HarvestLab
Satellite (GPS) assisted steeringAutoTrac? optional

Crop-harvesting units

Header height controlAdvanced header control (AHC) optional
Grass pick-ups3.0, 4.0, 4.5 m
9.8, 13.1, 14.8 ft
Maize or corn headers

Harvest channel


Length of cut

Range40 knives: 7-26 mm (0.275-1.0 in.) LOC / 1 mm (0.04 in.) steps
48 knives: 6-22 mm (0.24-0.87 in.) LOC / 1 mm (0.04 in.) steps

Feeding system/Feedrolls

Feed roll frame openingSwing away, 37-45 degree (angle)
Metal detectorStandard
Stone detector is optional
Width, front660 mm
26 in.
Standard feed roll driveHydro feedroll drive IVLOC standard
Infinitely header drive speed standard
Optional feed roll drive


Knife drum width680 mm
26.8 in.
Knife drum diameter668 mm
26.3 in.
Speed at rated engine speedStandard - 1100 rpm
Optional - 1200 rpm
Knife types available (crop)Straight - grass
Curved - corn
Number of knives40 or 48

Knife sharpening system

Reverse rotationYes
Automatic from cabYes, remote from cab
Reverse driveStandard
Reverse speed

Kernel processor

TypeSerrated roller
Quick-changeQuick change and remove

Serrated roller (kernel processor)

Maize, roll teeth number (speed differential)118 - 24 or 32 percent
Wholecrop, roll teeth number (speed differential)178 - 32 percent
Sorghum, roll teeth number (speed differential)238 - 32 percent
Weight145 kg
320 lb

Disk type (kernel processor)

Number of disks (top/bottom)15/14 plus 2-1/2
Diameter of disks240 mm
9.45 in.
Weight172.4 kg
380 lb

Blower/Crop accelerator

Number of blades10


Rotation, degrees210 degree (angle)
Hydraulic height positionHydraulic raise and lower standard
Automatic spout positioning optional
Double-cap deflectionStandard
Number of wear liners


Rotary radiator screen cleanerStandard
Automatic lubrication systemAutoLube optional
Engine oil and filter change durationJD+50? II oil: 500 hours
Other oil: 250 hours


With front tires710/70R42
With rear tires620/60R30
Transport length (without header)6.5 m
21.7 ft
Transport width (without header)3-3.5 m
9.84-11.5 ft
Transport height (to cab roof)3.89 m
12.75 ft
Working height (maximum)Height to spout: 6.60 m
21.65 ft
Approximate weight (without header)

Propelling drive

StandardHydrostatic, 3-speed - manual shift with helical gears


TypeStandard: Hydrostatic, 3-speed - manual shift with helical gears
Hydro-mechanical rear axle optional

Additional information

Date collected