John Deere 8420T
Power
284 hp
Production
2002-2005
Transmission
John Deere PowerShift
From the same series:
Introduction
John Deere 8420T Agricultural Crawler Tractor
The John Deere 8420T is a high-horsepower agricultural crawler tractor manufactured in Waterloo, Iowa, between 2002 and 2005. Designed for heavy-duty field operations, this tracked machine belongs to the 8000T series, engineered to provide superior traction and soil protection through its specialized undercarriage system.
Engine and Performance
The tractor is powered by an 8.1-liter, liquid-cooled inline engine. It delivers a rated net power of 270 hp (201.3 kW) and reaches a maximum net power of 300 hp (223.7 kW). The engine operates optimally between 1500 and 2200 RPM, featuring a compression ratio of 16.5:1. Maintenance intervals for oil changes are set at 250 hours, supported by a 21.5-liter oil capacity.
Transmission and Drive
The 8420T utilizes a John Deere PowerShift transmission, which allows for full power shifting without manual clutching. It provides 16 forward gears and 4 reverse gears, enabling precise speed selection for various agricultural tasks. The vehicle is steered via an electro-hydraulic power system and is equipped with hydraulic wet disc brakes for reliable stopping power.
Hydraulics and PTO
The hydraulic system is a closed-center, pressure-flow-compensated (PFC) design, capable of providing a standard pump flow of 30 gpm (113.6 lpm), with an optional configuration reaching 42.5 gpm (160.9 lpm). It operates at a pressure of 2900 psi and supports up to 5 valves. The independent rear PTO is designed for 1000 RPM operation with a 1-3/4 inch shaft, suitable for high-torque implements.
Dimensions and Undercarriage
The machine features an 89-inch wheelbase and is fitted with 24-inch tracks, providing a wide footprint for stability and reduced ground compaction. The total operational weight ranges between 25,950 and 26,380 pounds. The rear three-point hitch is rated for a lift capacity of 15,180 lbs (6885 kg), compatible with Category III/IIIN implements.
Conclusion
The John Deere 8420T is a robust, high-performance crawler tractor tailored for demanding agricultural environments where traction and soil integrity are critical. Its combination of a high-capacity hydraulic system, heavy-lift hitch, and power-shift transmission makes it a reliable asset for primary tillage and heavy-draft operations.
Production Information of John Deere, 8420T
- Agricultural Crawler tractor
- Built in Waterloo, Iowa, USA
| Manufacturer | John Deere |
|---|
Engine Specifications of John Deere, 8420T
- Liquid-cooled inline
| Coolant capacity | 35.9 qts [34.0 L] |
|---|---|
| Starter volts | 12 |
| Rated Power (gross) | 284 hp [211.8 kW] |
| Oil change | 250 h |
| Compression | 16.5:1 |
| Maximum Power (gross) | 314 hp [234.1 kW] |
| Displacement | 496 ci [8.1 L] |
| Oil capacity | 22.7 qts [21.5 L] |
| Rated Power (net) | 270 hp [201.3 kW] |
| Maximum Power (net) | 300 hp [223.7 kW] |
| Bore/Stroke | 4.56x5.06 inches [116 x 129 mm] |
| Operating RPM | 1500-2200 |
| Idle RPM | 900-2300 |
| Rated RPM | 2200 |
Transmission Information of John Deere, 8420T
Transmission variants 1
| Transmission | John Deere PowerShift |
|---|---|
| Oil capacity | 260 qts [246.1 L] |
| Type | Full power shift |
| Gears | 16 forward and 4 reverse |
Mechanical Specs of John Deere, 8420T
- Cab standard.
- Hydraulic wet disc brakes
| Drive | Crawler |
|---|---|
| Steering | Electro-hydraulic power |
Power Information of John Deere, 8420T
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 1000 (1-3/4) |
Hydraulics Specifications of John Deere, 8420T
| Type | Closed center pressure flow compensated (PFC) |
|---|---|
| Pump flow | 30 gpm [113.6 lpm] |
| Valves | 5 |
| Capacity | 65 gal [246.0 L] |
| Total flow | 33.5 gpm [126.8 lpm] |
| Pressure | 2900 psi [200.0 bar] |
Three-Point Hitch of John Deere, 8420T
| Rear Type | III/IIIN |
|---|---|
| Rear lift | 15,180 lbs [6885 kg] |
Electrical System of John Deere, 8420T
| Ground | Negative |
|---|---|
| Battery CCA | 925 |
| Batteries | 2 |
| Charging system | Alternator |
| Battery volts | 12 |
| Charging amps | 150 |
Where it sits
With 284 HP, the John Deere 8420T sits between 8320T (263 HP) and 8520T (305 HP) in John Deere's range. Its power puts it in the 93th percentile of 2000s models in our database (2822 machines).
Frequently asked questions
How much horsepower does the John Deere 8420T have?
The John Deere 8420T delivers 284 HP.
What years was the John Deere 8420T produced?
The John Deere 8420T was produced in 2002-2005.
What transmission does the John Deere 8420T use?
The John Deere 8420T uses a John Deere PowerShift transmission.