John Deere 4840 Tractor Parts
4840 parts and accessories
The John Deere 4840, manufactured from 1978 to 1982, was a popular row-crop tractor known for its power and reliability. Powered by a 176 HP diesel engine and boasting a robust PTO, the 4840 became a mainstay on farms across North America. Its comfortable cab and user-friendly design made it a favorite among farmers of the era.
The John Deere 4840 was introduced in 1978 as part of the 'Iron Horse' generation, replacing earlier models and offering increased power and improved features. It was produced until 1982. The heart of the 4840 is the John Deere 619 cubic inch (10.1L) inline 6-cylinder diesel engine, producing approximately 176 horsepower. This engine provided ample power for a variety of tasks. The tractor featured a Quad-Range transmission, offering 16 forward and 6 reverse speeds, providing operators with a wide range of gears for optimal performance in various field conditions. The 4840 delivered around 145 PTO horsepower at both 540 and 1000 RPM, allowing for versatile implement compatibility. Its hydraulic system boasted a flow rate of approximately 30 GPM, powering multiple remote hydraulic circuits. The 3-point hitch was a Category III, providing ample lift capacity for heavy implements. Commonly used in row crop farming, hay production, and general tillage operations, the 4840 distinguished itself from smaller models with its increased horsepower and heavier build, while offering a more economical option compared to the larger frame John Deere tractors of the time.
Specifications
| Engine | John Deere 619 ci (10.1L) 176 HP Diesel |
|---|---|
| PTO HP | 145 HP @ 540/1000 RPM |
| Transmission | Quad-Range, 16 Forward / 6 Reverse |
| Hydraulics | 30 GPM, 2-3 remotes |
| 3-Point Hitch | Category III, 6,800 lbs lift capacity |
| Fuel Capacity | 75 gallons |
| Weight | 16,740 lbs |
| Years Produced | 1978-1982 |
Maintenance Tips
- Engine Oil & Filter: Change the engine oil and filter every 250 hours of operation, using a high-quality diesel engine oil that meets John Deere's specifications.
- Hydraulic System: Regularly check hydraulic fluid levels and inspect for leaks. Change the hydraulic filter every 500 hours or annually, and use the recommended John Deere Hy-Gard fluid.
- Fuel System: Use clean, high-quality diesel fuel and replace the fuel filter every 250 hours. Drain any water from the fuel/water separator regularly to prevent contamination and injector issues.
- Seasonal Storage: Before storing the tractor for the off-season, fill the fuel tank to prevent condensation, change the engine oil and filter, and grease all lubrication points. Consider adding fuel stabilizer.
History & Background
The John Deere 4840 was introduced in 1978 as part of the new 'Iron Horse' generation of tractors from John Deere. It aimed to provide farmers with a reliable and powerful machine for demanding agricultural tasks. While there weren't significant redesigns during its production run, the 4840 solidified its place as a popular and dependable workhorse during a pivotal era in agricultural mechanization.
Frequently Asked Questions
What engine is in the John Deere 4840?
The John Deere 4840 is powered by a John Deere 619 cubic inch (10.1L) inline 6-cylinder diesel engine producing approximately 176 horsepower.
What is the PTO horsepower on a 4840?
The John Deere 4840 delivers approximately 145 PTO horsepower and offers both 540 and 1000 RPM PTO speed options.
What oil filter fits the 4840?
The John Deere 4840 typically uses a John Deere oil filter part number AR51727. Common cross-references include Wix 51794 or Napa 1794.
What are common parts needed for the 4840?
Common parts needed for the John Deere 4840 include engine oil filters, fuel filters, hydraulic filters, fan belts, radiator hoses, hydraulic cylinder seal kits, tie rod ends, steering components, and clutch discs/pressure plates.

R203463 - Hose Support
SKU: R203463
4 in stock

R183947 - Spacer
SKU: R183947
185 in stock

R113050 - O-Ring
SKU: R113050
143 in stock

R10093 - O-Ring
SKU: R10093
344 in stock

AR92109 - 10:00 coil) 12V A6 Style w/ Clutch (1 groove 5.75" pulley New Compressor
SKU: AR92109
232 in stock

AR90771 - Blower Motor Resistor
SKU: AR90771
399 in stock

AR88076 - Evaporator
SKU: AR88076
28 in stock

AR82014 - Switch Blower
SKU: AR82014
284 in stock

AR79857 - Oil Clr/Conden
SKU: AR79857
11 in stock

AR77344 - Thermal Limiter Fuse (Pkg of 6)
SKU: AR77344
85 in stock

AR71287-DEN - Denso A6 Style Clutch
SKU: AR71287-DEN
10 in stock

AR66028 - Blower Wheel
SKU: AR66028
26 in stock

AR65756 - Rec/Drier Outlet Line
SKU: AR65756
21 in stock

AR65755 - Return line to Q.Cplr Plug (w/ 2 pc Ret Line) Line
SKU: AR65755
26 in stock

AR62497 - Blower Motor
SKU: AR62497
26 in stock

AR59780 - Receiver Drier
SKU: AR59780
928 in stock

AR59779 - Switch AC/HT Temp
SKU: AR59779
493 in stock

AR58287 - Suction Side Coupling Q. Cplr Female Half
SKU: AR58287
55 in stock

AR58281 - Press. Line-To Evap Inlet Line Line
SKU: AR58281
120 in stock

AR58278 - Evap.Outlet Line to Rtn Line (2 pc Ret Line) Line
SKU: AR58278
99 in stock

AR58147 - Suction Side Male Half Coupling
SKU: AR58147
25 in stock

AR53154 - Blower Switch
SKU: AR53154
284 in stock

AR53152 - Sub To 220-215
SKU: AR53152
284 in stock

AR49964 - Blower Switch
SKU: AR49964
284 in stock
