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.

R73635 - MFWD Steering Motor Rear Pivot Pin
SKU: R73635
60 in stock

R72858 - Oil Seal
SKU: R72858
290 in stock

R66129 - Steering Arm (LH)
SKU: R66129
32 in stock

R66128 - Steering Arm (RH)
SKU: R66128
22 in stock

R63556 - Front Wheel (5/8" - 8 Bolt) Hub
SKU: R63556
Out of stock

R52188 - Upper/ Lower Bushing
SKU: R52188
113 in stock

R34733 - (25/Pack) O-Ring
SKU: R34733
1000 in stock

R30398 - Thrust (Spindle) Washer
SKU: R30398
326 in stock

JD16 - Wheel Bolt (9/16")
SKU: JD16
4520 in stock

AR53880 - Spindle (RH/LH)
SKU: AR53880
6 in stock

AR26625 - Steering Wheel
SKU: AR26625
220 in stock

469-I - Tapered Roller Bearing Cone
SKU: 469-I
2 in stock

453X-I - Tapered Bearing Cup
SKU: 453X-I
135 in stock

2794-I - Tapered Roller Bearing Cone
SKU: 2794-I
54 in stock

2720-I - Tapered Bearing Cup
SKU: 2720-I
169 in stock

R65239 - Special Head Pin
SKU: R65239
100 in stock

AT35121 - 90 Deg Elbow Fitting
SKU: AT35121
263 in stock

TY22404 - Bulk Water Outlet Manifold Hose
SKU: TY22404
160 in stock

RE48583 - 180° Thermostat
SKU: RE48583
78 in stock

RE42139 - Coolant Heater Element
SKU: RE42139
115 in stock

RE29018 - Fan (Set/2) Belt
SKU: RE29018
74 in stock

RE21895 - Radiator
SKU: RE21895
Out of stock

RE20022 - Water Pump Assembly
SKU: RE20022
49 in stock

R88397 - Water Manifold Outlet (2/Pack) Gasket
SKU: R88397
126 in stock
