John Deere 8630

Name: John Deere 8630
Brand: John Deere

Power

275 hp

Production

1975-1978

Engine

Turbocharged diesel, 6-cylinder

Transmission

John Deere Quad-Range

Drive

4WD

Over 200 HP 1970s

From the same series:

8430

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."

Introduction

Production Information of John Deere, 8630

The production information of the tractor (8630) includes details about its manufacturing.

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

This section sums up the dimension and tires information of the tractor.


Front axle	3.622 by 96 inches [91 by 2438 mm]
Wheelbase	125 inches [317 cm]
Height (exhaust)	134.5 inches [341 cm]
	118.4 inches*Long axle [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*Standard axle [243 cm]
Rear axle	3.622 by 118 inches [91 by 2997 mm]
Rear axle	3.622 by 96 inches [91 by 2438 mm]


Ag front	18.4-34
Ag rear	18.4-34

Engine Specifications of John Deere, 8630

Get the specifications for the engine and if different options are available.

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, 8630Y

Discover all variants of transmission available for this tractor model.

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, 8630Y

This section summarizes all mechanical information such as the brake system and other specifications.

Four-wheel drive

Sound-Gard cab standard. Optional air-conditioning.

Hydraulic wet disc brakes


Steering	Hydraulic power

Power Information of John Deere, 8630Y

Discover the power specifications and options available for this tractor model but also PTO (Power Take-off) information.


Rear PTO	Independent
Rear PTO Type	1000
Engine RPM	2100

Hydraulics Specifications of John Deere, 8630

Hydraulic system type, pressure, pump flow and valves.


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

Hitch category and rear/front lift capacity.


Rear Type	III

Electrical System of John Deere, 8630

Battery voltage, charging system and ground.


Ground	Negative
Battery volts	6
Battery CCA	975
Charging system	Alternator
Batteries	2

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.

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