| Manufacturer | John Deere |
| Price | 64,000(USD) |
| Model | 8440 |
| Equipment Type | Four-wheel Drive 4WD Tractors |
| Factory | Waterloo, Iowa, USA |
NEBRASKA TRACTOR TEST 1323 2
| Description | Diesel 16-speed 4WD September 10, 1979 - September 15, 1949 Link: Nebraska Tractor Test 1323 file PTO performance Drawbar performance |
| Power at rated engine speed | 179.83hp / 134.1kW |
| Fuel use | 11.2gal/hour / 42.4l/hour |
| Max power | 160.58hp / 119.7kW |
| Max pull | 25,383lbs / 11513kg |
JOHN DEERE 8440 POWER
| Engine | 215hp / 160.3kW |
| PTO (claimed) | 175hp / 130.5kW |
| Drawbar (tested) | 160.58hp / 119.7kW |
| PTO (tested) | 179.83hp / 134.1kW |
ENGINE DETAIL
The John Deere 8440, featuring a turbocharged 6-cylinder diesel engine, delivers a robust 215hp, optimizing power for heavy-duty applications such as tilling and plowing. Its compression ratio of 15.5:1 enhances fuel efficiency and torque output, particularly beneficial in high-load tasks at the operating RPM range of 1500-2100. However, maintenance considerations such as a substantial oil capacity of 22 quarts and a coolant capacity of 40 quarts must be factored in to ensure optimal engine performance and longevity.
| Description | John Deere turbocharged diesel 6-cylinder liquid-cooled |
| Displacement | 466ci / 7.6L |
| Bore/Stroke | 4.5625x4.75inches / 116x 121mm |
| Power | 215hp / 160.3kW |
| Compression | 15.5:1 |
| Rated RPM | 2100 |
| Idle RPM | 800-2300 |
| Operating RPM | 1500-2100 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 12 |
| Oil capacity | 22qts / 20.8L |
| Coolant capacity | 40qts / 37.9L |
JOHN DEERE 8440 ENGINE
The John Deere 8440, equipped with a 7.6L 6-cylinder diesel engine, provides robust power and torque for heavy-duty agricultural tasks. One advantage is its efficient fuel consumption, enhancing productivity during extended operations, though its weight can pose challenges on softer terrains. Ideal for large-scale farming and versatile applications, its performance is further supported by advanced transmission options for optimized speed control.
| Description | John Deere 7.6L 6-cyl diesel |
TRANSMISSION
The John Deere 8440 features a Quad-Range partial power shift transmission, providing versatility with 16 forward and 6 reverse gears but requiring a full stop to change ranges. The hydraulic wet disc clutch enhances smooth engagement, but the limited range shifting can impact productivity during field operations. Optimal for heavy tillage tasks, this tractor's oil capacity of 160 quarts supports extended operation while maintaining component health.
| Transmission | John Deere Quad-Range |
| Type | partial power shift |
| Gears | 16 forward and 6 reverse |
| Clutch | hydraulic wet disc |
| Oil capacity | 160qts / 151.4L |
| Description | Four gears (1-4) in four ranges (A-D). Tractor must be stopped to select range. Power shift between gears 1-2 and 3-4 within range |
SPEEDS
| Description | With 18.4-38 tires |
MECHANICAL
The John Deere 8440 boasts a 4x4 articulated 4WD chassis, enhancing traction and maneuverability across diverse terrains, making it ideal for heavy-duty agricultural applications. Its hydraulic differential lock improves traction in challenging conditions while the articulated power steering contributes to easier handling in tight spaces. The 16-speed partial power shift transmission allows for efficient speed management, optimizing fuel efficiency and productivity, though it may require operator training to master effectively.
| Chassis | 4x4 articulated 4WD |
| Differential lock | hydraulic front and rear |
| Steering | articulated power |
| Brakes | hydraulic wet disc |
| Cab | Cab standard |
| Transmission | 16-speed partial power shift |
CAPACITY
| Fuel | 156gal / 590.5L |
| Hydraulic system | 40gal / 151.4L |
HYDRAULICS
| Type | closed center |
| Capacity | 40gal / 151.4L |
| Valves | 2 |
| Pump flow | 33gpm / 124.9lpm |
TRACTOR HITCH
| Rear Type | III |
| Rear lift | 8545lbs / 3876kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 1000 |
JOHN DEERE 8440 TIRES
The John Deere 8440 features an 18.4-34 tire configuration on both the front and rear, which provides a wide ground contact area, enhancing stability and traction, especially in wet or soft soil conditions. The tractor's power and weight distribution are optimized for agricultural applications, making it suitable for heavy tillage and pulling operations. However, the relatively large tire size may lead to compaction in sensitive soils if not managed properly.
| Ag front | 18.4-34 |
| Ag rear | 18.4-34 |
DIMENSIONS
| Wheelbase | 125inches / 317cm |
| Length | 223.5inches / 567cm |
| Operating weight | 26,590lbs / 12061kg *With 20.8-38 duals |
| Ground clearance | 19.4inches / 49cm |
| Front axle | Rack-and-pinion: 3.937 by 118.4inches / 99by 3007mm |
| Rear axle | Rack-and-pinion: 3.937 by 118.4inches / 99by 3007mm |
| Front tread | 63 to 130inches / 160to 330cm |
| Rear tread | 63 to 130inches / 160to 330cm |
JOHN DEERE 8440 HEIGHT
| Hood | 87.1inches / 221cm |
| Cab | 126.6inches / 321cm |
| Exhaust | 134.5inches / 341cm |
DIMENSIONS & TIRES
The John Deere 8440 features a 125-inch wheelbase, which enhances stability during field operations, especially in uneven terrain. Weighing 26,590 lbs, it provides significant traction for heavy-duty tasks but may face challenges in soil compaction on softer grounds. The uniform 18.4-34 tire size optimizes versatility in various agricultural applications, though tire wear may increase under heavy loads or high-speed transport scenarios.
| Wheelbase | 125inches / 317cm |
| Weight | 26,590lbs / 12061kg |
| Front tire | 18.4-34 |
| Rear tire | 18.4-34 |
8440 SERIAL NUMBERS
| Location | Serial number plate on the rear of transmission case |
| 1979 | 1000 |
| 1980 | 2266 |
| 1981 | 3758 |
| 1982 | 5235 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 90 |
| Batteries | 2 |
| Battery CCA | 850 |
| Battery volts | 6 |