| Manufacturer | John Deere |
| Price | - |
| Model | 8400 |
| Equipment Type | Row-Crop Tractors |
| Factory | Waterloo, Iowa, USA |
NEBRASKA TRACTOR TEST 1691 2
| Description | Diesel 16-speed 4WD April 12 - May 9, 1995 Link: Nebraska Tractor Test 1691 file PTO performance Drawbar performance Gear 8 used for power test Gear 3 used for pull test |
| Max power | 202.28hp / 150.8kW |
| Fuel use | 12.5gal/hour / 47.3l/hour |
| Power at rated engine speed | 228.29hp / 170.2kW |
| Max pull | 29,240lbs / 13263kg |
JOHN DEERE 8400 POWER
| PTO (claimed) | 225hp / 167.8kW |
| Drawbar (tested) | 202.28hp / 150.8kW |
| PTO (tested) | 252.21hp / 188.1kW |
ENGINE DETAIL
The John Deere 8400 features a robust 8.1L turbocharged 6-cylinder engine that provides a high power output at a rated RPM of 2200, making it suitable for heavy-duty agricultural tasks. With a compression ratio of 15.1:1, it enhances fuel efficiency but may require high-quality diesel to avoid knock. Prospective users should consider the substantial oil and coolant capacities (29.6 qts and 30 qts respectively), which contribute to extended maintenance intervals, although this may lead to higher operational costs during routine servicing.
| Description | John Deere turbocharged aftercooled diesel 6-cylinder 12-valve liquid-cooled inline |
| Displacement | 496ci / 8.1L |
| Bore/Stroke | 4.56x5.06inches / 116x 129mm |
| Compression | 15.1:1 |
| Rated RPM | 2200 |
| Starter volts | 12 |
| Oil capacity | 29.6qts / 28.0L |
| Coolant capacity | 30qts / 28.4L |
JOHN DEERE 8400 ENGINE
The John Deere 8400 features an 8.1L 6-cylinder diesel engine, which provides robust power and torque for heavy-duty applications, making it ideal for large-scale farming operations. Pros include fuel efficiency and reduced emissions due to advanced engine technology; however, regular maintenance is crucial to prevent wear on the high-output diesel system. This tractor excels in tasks like plowing and towing heavy implements, contributing to increased productivity in agricultural settings.
| Description | John Deere 8.1L 6-cyl diesel |
TRANSMISSION
The John Deere 8400's PowerShift transmission enables seamless gear transitions, enhancing productivity during field operations with 16 forward and 4 reverse speeds to match varying terrain conditions. The hydraulic wet disc clutch provides improved durability and reduces the likelihood of slippage, while the oil capacity of 148 quarts ensures sufficient lubrication and cooling under heavy loads. Potential challenges include managing heat buildup in the transmission during extended use and ensuring regular maintenance to keep the hydraulic system functioning optimally.
| Transmission | John Deere PowerShift |
| Type | full power shift |
| Gears | 16 forward and 4 reverse |
| Clutch | hydraulic wet disc |
| Oil capacity | 148qts / 140.1L |
MECHANICAL
The John Deere 8400, equipped with a 4x4 MFWD chassis, offers enhanced traction and stability, making it ideal for varied terrains and heavy field operations. Its 16-speed full power shift transmission allows for seamless gear transitions, improving efficiency during plowing or hauling. The electro-hydraulic differential lock enhances field mobility by providing additional traction, but may require careful management to prevent wheel slip in tight turns on uneven ground.
| Chassis | 4x4 MFWD 4WD |
| Final drives | inboard planetary |
| Differential lock | electro-hydraulic |
| Steering | power |
| Brakes | differential hydraulic wet disc |
| Cab | CommandView Cab standard. Row-Trak guidance optional |
| Transmission | 16-speed full power shift |
CAPACITY
| Fuel | 135gal / 511.0L |
| Hydraulic system | 37gal / 140.0L |
| Front hubs | 3.2qts / 3.0L (each) |
| Front diff. | 11.5qts / 10.9L |
HYDRAULICS
| Type | closed center pressure-flow compensated (PFC) |
| Capacity | 37gal / 140.0L |
| Pressure | 2900psi / 200.0bar |
| Valves | 3 to 5 |
| SCV flow | 30gpm / 113.6lpm |
TRACTOR HITCH
| Rear Type | 3/3N |
| Control | electro-hydraulic draft sensing |
| Rear lift | 11700lbs / 5307kg 15650lbs / 7098kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 1000 (1.75)/540/1000 (1.375 optional) |
JOHN DEERE 8400 TIRES
The John Deere 8400, equipped with standard agricultural tires (14.9R34 front and 18.4R46 rear), offers a robust combination of traction and stability, ideal for diverse field conditions. The larger rear tire size enhances flotation and reduces soil compaction, while the front tire size aids in maneuverability and load distribution. However, considering tire selection is crucial for specific tasks; using narrower or narrower tires may improve performance in wet conditions or row crop applications.
| Standard tires (ag) | Front: 14.9R34. Rear: 18.4R46 |
DIMENSIONS
| Wheelbase | 116.1inches / 294cm |
| Length | 206.5inches / 524cm |
| Height (cab) | 120.2inches / 305cm |
| Clearance (front axle) | 23.2inches / 58cm |
| Rear axle | Rack and pinion: 4.331 by 118.5inches / 110by 3009mm |
| Front tread | 60 to 88inches / 152to 223cm |
JOHN DEERE 8400 WEIGHT
| Shipping | 18709lbs / 8486kg |
| Operating | 19,190lbs / 8704kg |
| Ballasted | 29,562lbs / 13409kg |
DIMENSIONS & TIRES
The John Deere 8400 features a wheelbase of 116.1 inches, providing stability and improved handling, especially in field conditions. Weighing between 18,709 and 19,190 pounds, it offers substantial traction for heavy-duty tasks, although this weight may impact mobility in soft or uneven terrain. The tire specifications, with front 14.9R34 and rear 18.4R46, allow for efficient power transfer and support increased load capacities, making it optimal for large-scale agricultural operations.
| Wheelbase | 116.1inches / 294cm |
| Weight | 18709 to 19190 pounds |
| Front tire | 14.9R34 |
| Rear tire | 18.4R46 |
8400 SERIAL NUMBERS
| Location | Serial number plate on the rear of the tractor, above the PTO shaft |
| 1995 | 1001 |
| 1996 | 6001 |
| 1997 | 10001 |
| 1998 | 20001 |
| 1999 | 24001 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 140 |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |