John Deere 8630
Power
275 hp
Production
1975-1978
Engine
Turbocharged diesel, 6-cylinder
Transmission
John Deere Quad-Range
Drive
4WD
From the same series:
Introduction
John Deere 8630 Four-Wheel Drive Tractor
The John Deere 8630 is a high-horsepower four-wheel drive tractor manufactured in Waterloo, Iowa, between 1975 and 1978. Designed for heavy-duty agricultural operations, it represents a significant model in the evolution of John Deere's large-frame machinery during the late 1970s.
Engine and Performance
The tractor is powered by a 6-cylinder, turbocharged diesel engine with a displacement of 619 cubic inches (10.1 liters). It delivers a rated power output of 275 horsepower at 2100 engine RPM. The engine features a liquid-cooling system and a 15.4:1 compression ratio, designed to provide consistent torque for demanding field tasks.
Transmission and Drivetrain
Equipped with the John Deere Quad-Range transmission, the 8630 offers 16 forward and 4 reverse gears. This system incorporates partial power shift capabilities and a hydraulic wet disc clutch, allowing for efficient speed adjustments and smooth transitions under load. The tractor utilizes a four-wheel drive configuration to maximize traction in various soil conditions.
Hydraulics and PTO
The hydraulic system is a closed-center, constant-pressure design capable of a pump flow of 33 gallons per minute (124.9 liters per minute) with a total capacity of 26 gallons. It supports two valves for implement control. The rear independent PTO operates at 1000 RPM, matched to the engine's rated speed of 2100 RPM, providing steady power for heavy-duty implements.
Operator Environment and Dimensions
The 8630 comes standard with the Sound-Gard cab, which was designed to improve operator comfort and reduce noise exposure. Optional air-conditioning was available to enhance the working environment. The tractor has a wheelbase of 125 inches and an overall length of 223.5 inches, with a ground clearance of 19.4 inches, ensuring stability and maneuverability for its size class.
Conclusion
The John Deere 8630 serves as a robust heavy-duty tractor, well-suited for large-scale farming applications requiring significant drawbar power and hydraulic capacity. Its combination of the Quad-Range transmission and a reliable turbocharged engine made it a standard-bearer for four-wheel drive technology in the late 1970s.
Production Information of John Deere, 8630
- Original price was $53,000 in 1978
- Four-wheel Drive (4WD) tractor
- Built in Waterloo, Iowa, USA
| Manufacturer | John Deere |
|---|
Dimension and Tires Information of John Deere, 8630
| Front axle | 3.622 by 96 inches [91 by 2438 mm] |
|---|---|
| Wheelbase | 125 inches [317 cm] |
| Height (exhaust) | 134.5 inches [341 cm] |
| Height (exhaust)(optional) | 118.4 inches [300 cm] |
| Length | 223.5 inches [567 cm] |
| Front axle | 3.622 by 118 inches [91 by 2997 mm] |
| Ground clearance | 19.4 inches [49 cm] |
| Width | 95.8 inches [243 cm] |
| Rear axle | 3.622 by 118 inches [91 by 2997 mm] |
| Rear axle | 3.622 by 96 inches [91 by 2438 mm] |
Long axle
Standard axle
| Ag front | 18.4-34 |
|---|---|
| Ag rear | 18.4-34 |
Engine Specifications of John Deere, 8630
- John Deere
- Liquid-cooled
- 6-cylinder
- Turbocharged diesel
| Air cleaner | Dry |
|---|---|
| Idle RPM | 800-2300 |
| Displacement | 619 ci [10.1 L] |
| Bore/Stroke | 5.12x5.00 inches [130 x 127 mm] |
| Power | 275 hp [205.1 kW] |
| Rated RPM | 2100 |
| Compression | 15.4:1 |
| Coolant capacity | 44 qts [41.6 L] |
| Starter volts | 12 |
| Operating RPM | 1500-2100 |
Transmission Information of John Deere, 8630
Transmission variants 1
| Transmission | John Deere Quad-Range |
|---|---|
| Clutch | Hydraulic wet disc |
| Type | Partial power shift |
| Gears | 16 forward and 4 reverse |
Mechanical Specs of John Deere, 8630
- Four-wheel drive
- Sound-Gard cab standard. Optional air-conditioning.
- Hydraulic wet disc brakes
| Steering | Hydraulic power |
|---|
Power Information of John Deere, 8630
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 1000 |
| Engine RPM | 2100 |
Hydraulics Specifications of John Deere, 8630
| Type | Closed center constant pressure |
|---|---|
| Pump flow | 33 gpm [124.9 lpm] |
| Capacity | 26 gal [98.4 L] |
| Valves | 2 |
Three-Point Hitch of John Deere, 8630
| Rear Type | III |
|---|
Electrical System of John Deere, 8630
| Ground | Negative |
|---|---|
| Battery volts | 6 |
| Battery CCA | 975 |
| Charging system | Alternator |
| Batteries | 2 |
Where it sits
With 275 HP, the John Deere 8630 sits between 7520 (150 HP) and 8430 (305 HP) in John Deere's range. Its power puts it in the 94th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the John Deere 8630 have?
The John Deere 8630 delivers 275 HP.
What years was the John Deere 8630 produced?
The John Deere 8630 was produced in 1975-1978.
What engine does the John Deere 8630 have?
The John Deere 8630 is powered by a Turbocharged diesel, 6-cylinder engine.
What transmission does the John Deere 8630 use?
The John Deere 8630 uses a John Deere Quad-Range transmission.
Is the John Deere 8630 4WD?
The John Deere 8630 is available in 4WD.