| Manufacturer | John Deere |
| Price | - |
| Model | 840 |
| Equipment Type | Utility Tractors |
| Factory | Mannheim, Baden-Württemberg, Germany |
JOHN DEERE 840 POWER
| Engine | 37.5hp / 28.0kW |
| PTO (claimed) | 33.5hp / 25.0kW |
ENGINE DETAIL
The John Deere 840 tractor features a robust 3-cylinder, 2.9L diesel engine with a direct injection fuel system, providing a suitable power output of 37.5 hp at a rated RPM of 2400. Its high compression ratio of 16.8:1 enhances fuel efficiency, making it ideal for small-scale farming or light-duty tasks. However, the engine's limited power may pose challenges in heavy-duty applications, necessitating careful consideration of intended usage scenarios.
| Description | John Deere diesel 3-cylinder liquid-cooled |
| Displacement | 179ci / 2.9L |
| Bore/Stroke | 4.19x4.33inches / 106x 110mm |
| Power | 37.5hp / 28.0kW |
| Fuel system | direct injection |
| Compression | 16.8:1 |
| Rated RPM | 2400 |
| Operating RPM | 1300-2400 |
| Starter volts | 12 |
| Starter power | 4 hp /3.0 kW |
| Oil capacity | 7.4qts / 7.0L |
| Coolant capacity | 11.1qts / 10.5L |
JOHN DEERE 840 ENGINE
The John Deere 840 tractor features a robust 2.9L three-cylinder diesel engine, offering efficient fuel consumption and reliable torque delivery for various agricultural tasks. Its compact design enhances maneuverability in tight spaces, but the smaller engine may limit heavy-duty performance compared to larger models. Ideal for small to medium-sized farms, the 840 is well-suited for tasks like tilling, mowing, and light hauling, balancing power with operational efficiency.
| Description | John Deere 2.9L 3-cyl diesel |
TRANSMISSIONS OVERVIEW
The John Deere 840 tractor features an 8-speed collar shift transmission alongside a 16-speed two-speed power shift option, providing versatility in handling various field conditions and workloads. The collar shift allows for straightforward gear engagement, ideal for operators needing precise control during low-speed applications. However, the complexity of the power shift system may present a learning curve for new operators, requiring proper training to maximize efficiency and prevent transmission wear.
| Description | 8-speed collar shift 16-speed two-speed power shift |
TRANSMISSION 1
The John Deere 840 features a collar shift transmission that provides reliable gear engagement, allowing for efficient power transfer in various agricultural applications. With 8 forward and 4 reverse gears, it offers versatility in speed and maneuverability, making it suitable for both fieldwork and transport. The dry disc clutch is maintenance-friendly; however, it may require more precise operator technique to prevent slippage under heavy loads.
| Type | collar shift |
| Gears | 8 forward and 4 reverse |
| Clutch | dry disc |
TRANSMISSION 2
The John Deere 840 features a two-speed power shift transmission, providing seamless gear transitions which enhance operational efficiency. With 16 forward and 8 reverse gears, this tractor offers versatile speed selection for various applications, making it suitable for both heavy-duty and fine-tuning tasks. However, operators must be familiar with the shifting mechanism to maximize performance and avoid potential transmission wear.
| Type | two-speed power shift |
| Gears | 16 forward and 8 reverse |
MECHANICAL
The John Deere 840 features a 4x2 2WD chassis with planetary final drives, offering efficient power transfer but limiting traction on uneven terrain. The manual steering may lack precision compared to power steering systems, while the hydraulic wet disc brakes provide effective stopping power, enhancing safety in various conditions. The 8-speed collar shift and optional 16-speed two-speed power shift transmissions enhance operational efficiency, making it versatile for a range of farming tasks, although the manual shift may require more operator skill.
| Chassis | 4x2 2WD |
| Final drives | planetary |
| Steering | manual |
| Brakes | hydraulic wet disc |
| Cab | Four-post ROPS |
| Transmissions | 8-speed collar shift 16-speed two-speed power shift |
CAPACITY
| Fuel | 20.6gal / 78.0L |
| Hydraulic system | 10.8gal / 40.9L |
HYDRAULICS
| Type | closed center |
| Capacity | 10.8gal / 40.9L |
| Pump flow | 6.1gpm / 23.1lpm |
TRACTOR HITCH
| Rear Type | II/I |
| Rear lift | 4878lbs / 2212kg |
POWER TAKE-OFF (PTO)
| Rear PTO | live/independent |
| Clutch | dry disc/wet disc, independent PTO |
| Rear RPM | 540 |
| Engine RPM | 1000@2070 |
| Front PTO | optional |
| Front RPM | 1000 |
JOHN DEERE 840 TIRES
The John Deere 840 tractor features a robust tire configuration with Ag front tires 6.50-16, providing stability and agility in maneuvering, while the Ag rear options of 9.5-36 or 12.4-28 enable enhanced traction on various terrain. This versatility allows for effective operation in both row crop farming and light tillage tasks. However, the choice of rear tire size can impact ground clearance and performance; selecting the appropriate size based on the operational scenario is crucial for optimized tractor functionality.
| Ag front | 6.50-16 |
| Ag rear | 9.5-36/12.4-28 |
DIMENSIONS
| Wheelbase | 74.4inches / 188cm |
| Length | 138inches / 350cm |
| Width | 65.4inches / 166cm |
| Height (ROPS) | 94.1inches / 239cm |
| Height (exhaust) | 103.1inches / 261cm |
| Shiping weight | 5004lbs / 2269kg |
| Clearance (front axle) | 21inches / 53cm |
| Front tread | 49.6 to 79.5inches / 125to 201cm |
| Rear tread | 53.5 to 73.2inches / 135to 185cm |
DIMENSIONS & TIRES
The John Deere 840 features a wheelbase of 74.4 inches, providing excellent stability for various agricultural tasks, though it may limit maneuverability in tighter spaces. Weighing 5004 lbs, its robust structure supports heavy-duty applications, but this weight may also present challenges in soft or uneven terrain. The tire combination of 6.50-16 in the front and 12.4-32 in the rear offers a good balance of traction and flotation, suitable for a range of field operations while potentially impacting ground pressure management.
| Wheelbase | 74.4inches / 188cm |
| Weight | 5004lbs / 2269kg |
| Front tire | 6.50-16 |
| Rear tire | 12.4-32 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 33 |
| Batteries | 2 |
| Battery volts | 12 |