International Harvester 664 Overview
The International Harvester 664 was built for 1972 and 1973 as a two-wheel-drive utility tractor. Its four-cylinder D-239 diesel displaces 239 cubic inches (3.9 L); published figures list 62 hp at the PTO and 54 hp at the drawbar, both claimed ratings.
It has open-center hydraulics rated at 12 gpm and a Category II hitch with draft control. The independent rear PTO, tire, fluid, electrical, and serial details are useful starting points, but the 10-speed Torque Amplifier and 5-speed gear configurations must be matched to the individual tractor.
For documentation, the reviewed IH-O-664 preview includes a model-specific brake supplement and controls material. The IH-P-664 parts-catalog and IH-S-656CHASIS service-manual previews identify their publication families, but both are excerpts rather than full manuals.
International Harvester 664 Quick Answers
- What engine is in an IH 664?The 664 is listed with an International Harvester D-239 four-cylinder diesel rated at 2,400 rpm, with 239 cubic inches (3.9 L) of displacement.
- How much horsepower does an IH 664 have?Published claimed ratings are 62 hp at the PTO and 54 hp at the drawbar. They are claimed figures, not a model-matched independent test result.
- What transmission options were offered?The published options are a 10-speed Torque Amplifier transmission and a 5-speed gear transmission. Identify the installed version before using gear or clutch details.
- What is the IH 664 engine oil capacity?The listed engine oil capacity is 10 quarts (9.5 L). Capacity alone does not establish the correct oil grade or fill procedure.
- What PTO does an IH 664 use?It is listed with an independent rear PTO and a 540 (1.375) shaft, with 540 PTO rpm at 2,000 engine rpm.
- Where do the IH 664 serial numbers start?The published year-start serials are 2501 for 1972 and 3212 for 1973. A serial is the starting point for matching configuration-sensitive parts.
- Which manuals are available for the IH 664?Reviewed previews identify the IH-O-664 operator manual, IH-P-664 parts catalog, and IH-S-656CHASIS chassis service manual. Each preview is shorter than the complete publication.
Engine and Power
The D-239 four-cylinder diesel is listed at 239 cu in (3.9 L), with a 3.875 by 5.06 in bore and stroke and a 2,400 rpm rating. The operator-manual preview confirms the 664 literature identity but is not a full engine-service manual.
Diesel engine
| Displacement | 239 ci 3.9 L |
|---|---|
| Bore Stroke | 3.875x5.06 inches 98 x 129 mm |
| Air Cleaner | dry |
| Compression | 16:1 |
| Rated Rpm | 2400 |
| Idle Rpm | 900-2400 |
| Starter | electric |
| Starter Volts | 12 |
| Engine Oil Capacity | 10 qts 9.5 L |
| Coolant Capacity | 17 qts 16.1 L |
Manufacture years
Transmission
The 664 was offered with a 10-speed Torque Amplifier transmission and a 5-speed gear version. The installed transmission needs identifying before gear-count or clutch details are applied to a particular tractor.
Torque Amplifier
| Name | Torque Amplifier |
|---|---|
| Type | two-speed power shift |
| Gears | 10 forward and 2 reverse |
| Clutch | 279mm dry disc |
5-speed gear
| Type | gear |
|---|---|
| Gears | 5 forward and 1 reverse |
| Clutch | 279mm dry disc |
PTO and Hitch
The listing identifies independent rear PTO equipment and a 540 (1.375) shaft at 2,000 engine rpm. PTO equipment can vary, so the installed shaft and speed matter when matching implements.
Rear PTO
Rear PTO type
Engine RPM
Rear hitch
Hydraulics
Open-center hydraulic pump flow is listed at 12 gpm. The 664 also has a Category II hitch with draft control; the chassis-service preview includes hydraulic-system sections but is not a complete manual.
Type
Pump flow
Fluids, Battery, and Service Facts
Listed capacities are 17.5 gallons of fuel, 10 quarts of engine oil, and 17 quarts of coolant. Capacity does not establish the fluid grade, so the correct fill specification remains configuration-dependent.
Fuel tank
Battery volts
Battery Ah
Tires and Dimensions
Published agricultural tires are 6.50-16 front and 14.9-30 rear, with a 74-inch wheelbase and 5,950 lb shipping weight. Wheel and front-axle choices can change the actual fit.
Wheelbase
Weight
Length
Front tire
Rear tire
Electrical
The cataloged electrical setup uses a 32-amp alternator, two 6-volt batteries, and a 12-volt starter. Confirm the installed system before ordering electrical parts.
Charging system
Charging amps
Battery volts
Serial Number Lookup
The published year-start serials are 2501 for 1972 and 3212 for 1973. Serial numbers are the first step in identifying parts and configuration details.
1972
1973
Manuals and Documents
The IH-O-664 file is a nine-page commercial preview, not the complete operator manual. Its visible pages include the 664 cover, a model-specific brake supplement, safety material, instruments, controls, and break-in information.
The IH-P-664 parts-catalog preview has a 664 cover and major-group index for brakes, cooling, drivetrain, electrical, hydraulics, power, suspension, wheels, and more. The IH-S-656CHASIS preview covers the 664 among several models and is limited to chassis systems rather than complete D-239 engine service literature.
No model-matched Nebraska Tractor Test record is included because none was verified for this 664 reference. The operator, parts, and chassis literature previews are the confirmed documents attached to this model.
Operator manual preview
- International Harvester 664 operator-manual preview - IH-O-664operation, maintenance, and specifications
Reviewed nine-page preview with the 664 cover, brake supplement, controls, safety, and break-in material. It is not the complete manual.
Open operator-manual preview
Operator manual
- International Harvester 664 operator manual listingoperation, maintenance, and specifications
Commercial listing for a 90-page diesel operator-manual reproduction. It is a manual-access reference, not a reviewed complete manual.
View operator manual
Parts catalog
- International Harvester 664 parts-catalog preview - IH-P-664parts matching
Reviewed nine-page preview with the 664 cover and major-group index. It is not the complete illustrated catalog.
Open parts-catalog preview
Service manual
- International Harvester 656/664 chassis-service manual preview - IH-S-656CHASISoperation, maintenance, and specifications
Reviewed 23-page multi-model chassis preview for steering, transmission, PTO, hydraulics, brakes, and testing. It excludes complete engine service coverage.
Open chassis-service preview
Parts Checks Before Ordering
For parts work, start with the model year and serial range, then match the 10-speed Torque Amplifier or 5-speed transmission, PTO equipment, front axle, and tire setup. The IH-P-664 preview provides a catalog group map, but a full serial-matched catalog is needed for a part-number decision.
The multi-model chassis-service preview includes transmission, independent PTO, hydraulics, and brake sections. It is a useful repair-literature lead, while item-specific settings and parts still need the publication and tractor to match.
- IH-P-664 parts-catalog previewNine-page model-specific preview with a major-group index for the 664. It is not the complete catalog.Open parts-catalog preview
- IH-S-656CHASIS chassis-service previewTwenty-three-page multi-model preview covering 664 chassis systems; use the complete matching publication for settings and part-number decisions.Open chassis-service preview
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.