Introduction
International Harvester 634: Overview and Specifications
The International Harvester 634 is a classic agricultural tractor produced between 1968 and 1972 at the Doncaster facility in England. As a mid-range utility tractor, it was engineered to provide consistent performance for standard field operations and general farm maintenance.
Engine and Performance
The tractor is powered by the International Harvester BD-281, a 4.6-liter, 4-cylinder liquid-cooled diesel engine. It generates 66 horsepower (49.2 kW) at a rated speed of 1600 RPM. The engine produces a maximum torque of 225 lb-ft (305.1 Nm) at 1000 RPM, providing the necessary lugging ability for tillage and hauling duties.
Transmission and Drivetrain
The 634 features a manual transmission offering 8 forward speeds and 2 reverse gears, coupled with a 330mm dry disc clutch. It was manufactured primarily as a 4x2 2WD machine, although 4x4 conversions were performed by County. Steering varies by configuration, ranging from manual in 2WD versions to power-assisted steering.
Hydraulics and Hitch
Equipped with a hydraulic system operating at 2500 psi (172.4 bar), the tractor provides a pump flow of 10.4 gpm (39.4 lpm). The rear hitch is a Category II system equipped with both position and draft control, offering a lift capacity of 3,360 lbs (1524 kg) to handle various implements.
PTO and Electrical
The machine includes an independent rear PTO designed to operate at 540 RPM, which is achieved at an engine speed of 1458 RPM. The electrical system is built on a 12-volt architecture, utilizing a generator for battery charging and a 95 AH battery for starting.
Conclusion
With a total production run of 3,848 units, the International Harvester 634 remains a respected machine among collectors and small-scale farmers. Its mechanical simplicity, combined with a robust diesel engine and standard Category II hitch, makes it a reliable asset for those requiring a versatile tractor for secondary field work.
Production Information of International Harvester, 634
- Built in Doncaster, England
| Manufacturer | International Harvester |
|---|---|
| Total built | 3,848 |
Dimension and Tires Information of International Harvester, 634
| 2WD Wheelbase | 86.8 inches [220 cm] |
|---|---|
| 2WD Length | 138 inches [350 cm] |
| Height (cab) | 96 inches [243 cm] |
| AWD Wheelbase | 75 inches [190 cm] |
| AWD Front tread | 60 to 80 inches [152 to 203 cm] |
| 4WD Wheelbase | 86.8 inches [220 cm] |
| 4WD Length | 139 inches [353 cm] |
| AWD Length | 150 inches [381 cm] |
| Width | 65.5 inches [166 cm] |
| 4WD Front tread | 53 to 66 inches [134 to 167 cm] |
| 2WD Front tread | 52 to 61 inches [132 to 154 cm] |
| AWD Rear tread | 60 to 80 inches [152 to 203 cm] |
| 4WD Rear tread | 56 to 72 inches [142 to 182 cm] |
| 2WD Rear tread | 56 to 72 inches [142 to 182 cm] |
| 2WD Standard tires (ag) | Front: 7.50-16. Rear: 11-38 |
|---|---|
| 4WD Standard tires (ag) | Front: 10-24. Rear: 12-38 |
| AWD Standard tires (ag) | Front: 14-30. Rear: 14-30 |
Engine Specifications of International Harvester, 634
- International Harvester BD-281
- Liquid-cooled
- Diesel
- 4-cylinder
| Starter volts | 12 |
|---|---|
| Displacement | 281 ci [4.6 L] |
| Rated RPM | 1600 |
| Bore/Stroke | 4.125x5.25 inches [105 x 133 mm] |
| Torque RPM | 1000 |
| Torque | 225 lb-ft [305.1 Nm] |
| Power | 66 hp [49.2 kW] |
Transmission Information of International Harvester, 634
Transmission variants 1
| Gears | 8 forward and 2 reverse |
|---|---|
| Clutch | 330mm dry disc |
Mechanical Specs of International Harvester, 634
- Mechanical disc brakes
- Open operator station. Cab optional.
| Drive | 4x2 2WD |
|---|---|
| 4WD Steering | Power |
| 4WD Steering(optional) | 4x4 4WD |
| 2WD Steering | Manual |
Four-wheel drive conversion by County
Power Information of International Harvester, 634
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 540 (1.375) |
| Engine RPM | 540@1458 |
Hydraulics Specifications of International Harvester, 634
| Pressure | 2500 psi [172.4 bar] |
|---|---|
| Steering press. | 1500 psi [103.4 bar] |
| Pump flow | 10.4 gpm [39.4 lpm] |
| Steering flow | 4.8 gpm [18.2 lpm] |
Three-Point Hitch of International Harvester, 634
| Rear Type | II |
|---|---|
| Control | Position and draft control |
| Rear lift | 3360 lbs [1524 kg] |
Electrical System of International Harvester, 634
| Charging system | Generator |
|---|---|
| Battery volts | 12 |
| Battery AH | 95 |
Where it sits
With 66 HP, the International Harvester 634 sits between Hydro 84 (65 HP) and 574 (67 HP) in International Harvester's range. Its power puts it in the 69th percentile of 1960s models in our database (709 machines).
Frequently asked questions
How much horsepower does the International Harvester 634 have?
The International Harvester 634 delivers 66 HP.
What years was the International Harvester 634 produced?
The International Harvester 634 was produced in 1968-1972.
What engine does the International Harvester 634 have?
The International Harvester 634 is powered by a Diesel, 4-cylinder engine.
Is the International Harvester 634 4WD?
The International Harvester 634 is available in 2WD/4WD.