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.

AR74411 - Accessory Relay
SKU: AR74411
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AR64422 - Flasher Control Switch
SKU: AR64422
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AR58126 - Ignition (12 Volt) Switch
SKU: AR58126
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AR55827 - Voltage Regulator
SKU: AR55827
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AR54445 - Light Switch Knob
SKU: AR54445
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AR48724 - Light (12 Volt) Switch
SKU: AR48724
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AR21823 - Horn/ Ether Start Aid (12 Volt) Switch
SKU: AR21823
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AR21085 - Tachometer Cable
SKU: AR21085
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AD2062R - Light Bulb
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57M8340 - 7 Pin (North America) Implement Lights Plug
SKU: 57M8340
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RE50533 - Center Link Body
SKU: RE50533
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RE44561 - Center Link End
SKU: RE44561
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RE44559 - Center Link End
SKU: RE44559
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RE44558 - Center Link Assembly
SKU: RE44558
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R80447 - Drawbar Hammerstrap
SKU: R80447
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R79916 - 1" Pin; Lift Link Upper End
SKU: R79916
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R67121 - Rockshaft Control Valve Housing Gasket
SKU: R67121
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R64707 - Sway Block (LH)
SKU: R64707
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R64706 - Sway Block (RH)
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R64084 - Handle
SKU: R64084
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R62760 - Front Drawbar Pin
SKU: R62760
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R62081 - Drawbar w/ 1.750" Offset
SKU: R62081
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R125450 - Top Link Pin
SKU: R125450
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JD8856 - Needle Bearing
SKU: JD8856
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