International Harvester 634
The International Harvester 634 is a tractor produced by International Harvester. It is equipped with a 281 ci 4.6 L engine. The listed engine power is Diesel (listed): 66 hp / 49.2 kW. Transmission: 8 forward and 2 reverse. Drive type: 4x2 2WD. Operating weight: 6546 to 9574 pounds.
Engine Power
Diesel (listed): 66 hp / 49.2 kW
Drive & Traction
4x2 2WD
Fuel & Capacities
20.4 gal
77.2 L
Transmission
8 forward and 2 reverse
Operating Weight
6546 to 9574 pounds
Overview
 | 1968 - 1972 |
|---|
Production | |
|---|---|
Manufacturer | International Harvester |
Built in Doncaster, England | |
Total built | 3,848 |
International Harvester 634 Engine | |
|---|---|
International Harvester 4.6L 4-cyl diesel | |
Fuel tank | 20.4 gal
77.2 L |
Engine details ...  | |
International Harvester 634 Transmission | |
|---|---|
8-speed | |
Transmission details ...  |
International Harvester 634 Power | |
|---|---|
Engine | 66 hp
49.2 kW |
PTO (claimed) | 59.3 hp
44.2 kW |
Mechanical | |
|---|---|
Drive | 4x2 2WD |
4x4 4WD *Four-wheel drive conversion by County | |
2WD Steering | manual |
4WD Steering | power |
Mechanical disc brakes | |
Open operator station. Cab optional. | |
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 |
Tractor hitch | |
|---|---|
Rear Type | II |
Control | position and draft control |
Rear lift | 3360 lbs
1524 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540 (1.375) |
Engine RPM | 540@1458 |
Dimensions & Tires | |
|---|---|
2WD Wheelbase | 86.8 inches
220 cm |
4WD Wheelbase | 86.8 inches
220 cm |
AWD Wheelbase | 75 inches
190 cm |
Weight | 6546 to 9574 pounds |
Front tire | 7.50-16 |
2WD Rear tire | 11-38 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | generator |
Battery volts | 12 |
Battery AH | 95 |
References | |
|---|---|
 | |
The Roar of Dust and Diesel - A Story of International Harvester Doncaster by Mike Teanby | |
634 Diesel Tractors published by International Harvester |
Engine
Engine Detail — 281 ci / 4.6 L Diesel
Manufacturer | International Harvester BD-281 |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 281 ci
4.6 L |
Bore/Stroke | 4.125x5.25 inches
105 x 133 mm |
Power | 66 hp
49.2 kW |
Rated RPM | 1600 |
Torque | 225 lb-ft
305.1 Nm |
Torque RPM | 1000 |
Starter volts | 12 |
Transmission
Transmission — 8 forward and 2 reverse
Gears | 8 forward and 2 reverse |
Clutch | 330mm dry disc |
Dimensions
International Harvester 634 Tires | |
|---|---|
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 |
Dimensions | |
|---|---|
2WD Wheelbase | 86.8 inches
220 cm |
4WD Wheelbase | 86.8 inches
220 cm |
AWD Wheelbase | 75 inches
190 cm |
2WD Length | 138 inches
350 cm |
4WD Length | 139 inches
353 cm |
AWD Length | 150 inches
381 cm |
Width | 65.5 inches
166 cm |
Height (cab) | 96 inches
243 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 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 |
International Harvester 634 Weight | |
|---|---|
2WD Operating | 6546 lbs
2969 kg |
4WD Operating | 7694 lbs
3489 kg |
AWD Operating | 9574 lbs
4342 kg |
Photos
International Harvester 634
Recommended Implements & Sizing Guide
Engineering recommendations for International Harvester 634 based on its 66 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 3 to 4 Bottom (16")3 - 4 铧 (40 cm) | Heavy Duty | Suitable for medium loam and stubble turnover. |
Rotary Cutter / MowerMowing & Clearing | 7 to 8 ft (84-96 in)2.1 - 2.4 m | Heavy Duty | Heavy-duty twin spindle cutter for overgrown acreage. |
Rotary TillerSeedbed Prep | 78 to 84 in200 - 215 cm | Heavy Duty | Heavy commercial tiller with multi-speed gearbox. |
Disc HarrowSecondary Tillage | 7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙 | Medium Duty | Field leveling and clod breaking behind plows. |
Hay BalerHay & Forage | 4x4 to 4x5 Round Baler1.2x1.5 m 紧凑圆捆机 | Heavy Duty | Silage and dry hay; 540 RPM PTO with slip-clutch. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for International Harvester 634.
Estimated Continuous Field Runtime: 5.9 hrs
Approximately 5.9 hours of continuous field operation at ~75% rated power on a full tank (20.4 gal / 77.2 L).
Estimated 75% Load Fuel Burn~3.4 gal/hr (13 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
International Harvester 634 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for International Harvester 634.
Converted Equivalents:
Horsepower (HP)66 hp
Kilowatts (kW)49.2 kW
Metric Horsepower (PS / CV)66.9 PS
Direct Competitor Comparison
Compare International Harvester 634 against same-era industry alternatives in the same horsepower class.
Current Model
International Harvester
International Harvester 634
Engine Power:Diesel (listed): 66 hp / 49.2 kW
★ Baseline Reference
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