International Harvester
International Harvester 634
The International Harvester 634 is a farm tractor produced from 1968 to 1972 by International Harvester in Doncaster, England. It features a 4.6L 4-cylinder diesel engine producing 66 hp, with an 8-speed transmission. The tractor offers 2WD and 4WD options, with mechanical disc brakes and an open operator station with optional cab. It has a rear PTO with 540 rpm and a rear hitch with position and draft control. The 634 is equipped with hydraulic systems providing 2500 psi pressure and a pump flow of 10.4 gpm. Dimensions vary by drive type, with weights ranging from 6546 to 9574 pounds. Standard tires differ for 2WD, 4WD, and AWD configurations.
Power66 hp
Founded1968 - 1972
Model634
Technical Specifications
Detailed specifications and technical data for International Harvester 634
Power
| Engine | 66 hp (49.2 kW) |
|---|---|
| PTO (claimed) | 59.3 hp (44.2 kW) |
Engine
| Type | diesel |
|---|---|
| Model | International Harvester BD-281 |
| Power | 66 hp (49.2 kW) |
| Torque | 225 lb-ft (305.1 Nm) |
| Cooling | liquid-cooled |
| Cylinders | 4-cylinder |
| Fuel tank | 20.4 gal (77.2 L) |
| Rated RPM | 1600 |
| Torque RPM | 1000 |
| Bore/Stroke | 4.125x5.25 inches (105 x 133 mm) |
| Displacement | 281 ci (4.6 L) |
| Starter volts | 12 |
Electrical
| Battery AH | 95 |
|---|---|
| Battery volts | 12 |
| Charging system | generator |
Hydraulics
| Pressure | 2500 psi (172.4 bar) |
|---|---|
| Pump flow | 10.4 gpm (39.4 lpm) |
| Steering flow | 4.8 gpm (18.2 lpm) |
| Steering press. | 1500 psi (103.4 bar) |
Mechanical
| Drive | 4x2 2WD, 4x4 4WD (Four-wheel drive conversion by County) |
|---|---|
| Brakes | Mechanical disc brakes |
| 2WD Steering | manual |
| 4WD Steering | power |
| Operator station | Open operator station. Cab optional. |
Production
| Built in | Doncaster, England |
|---|---|
| Total built | 3,848 |
| Manufacturer | International Harvester |
| Years produced | 1968 - 1972 |
Transmission
| Type | 8-speed |
|---|
Tractor hitch
| Control | position and draft control |
|---|---|
| Rear Type | II |
| Rear lift | 3360 lbs (1524 kg) |
Dimensions & Tires
| Width | 65.5 inches (166 cm) |
|---|---|
| Weight | 6546 to 9574 pounds |
| 2WD Length | 138 inches (350 cm) |
| 4WD Length | 139 inches (353 cm) |
| AWD Length | 150 inches (381 cm) |
| Height (cab) | 96 inches (243 cm) |
| 2WD Operating | 6546 lbs (2969 kg) |
| 2WD Wheelbase | 86.8 inches (220 cm) |
| 4WD Operating | 7694 lbs (3489 kg) |
| 4WD Wheelbase | 86.8 inches (220 cm) |
| AWD Operating | 9574 lbs (4342 kg) |
| AWD Wheelbase | 75 inches (190 cm) |
| 2WD Rear tread | 56 to 72 inches (142 to 182 cm) |
| 4WD Rear tread | 56 to 72 inches (142 to 182 cm) |
| AWD Rear tread | 60 to 80 inches (152 to 203 cm) |
| 2WD Front tread | 52 to 61 inches (132 to 154 cm) |
| 4WD Front tread | 53 to 66 inches (134 to 167 cm) |
| AWD Front tread | 60 to 80 inches (152 to 203 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 |
Power Take-off (PTO)
| Rear PTO | independent |
|---|---|
| Engine RPM | 540@1458 |
| Rear PTO Type | 540 (1.375) |
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