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International Harvester 634

International Harvester 634 tractor
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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.
International Harvester 634IH 634farm tractor66 hp tractor4.6L diesel tractor8-speed transmissiontractor specs
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)