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Tractor · 1959Unverified

International Harvester 660

Name: International Harvester 660
Brand: International Harvester

International Harvester 660 — Standard-tread tractor · 79 hp. Reference specifications; pending source verification.

The International Harvester 660 is a tractor with a rated output of 79 hp, placing it in the middle of its power class. Produced between 1959 and 1963, this tractor features a 6-cylinder diesel liquid-cooled engine, coupled with a hydrostatic transmission for two-wheel drive. Weighing between 9635 and 9875 pounds, the 660 is designed to handle tasks on approximately 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

79 hp

Max power

48.0 kW

Weight

9635 to 9875 pounds

Catalogue coverage

Variants represented

Richest spec table

107 rows

Recorded power

79 hp

Transmissions

5-speed

Production years

1959-1963

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerInternational HarvesterReference

Standard-tread tractorReference

Total built6,945Reference

Original price$6,000 (1963)Reference

Two-wheel driveReference

SteeringmanualReference

Steeringhydrostatic power optionalReference

Independent mechanical disc brakesReference

Open operator station.Reference

Engine

International Harvester 4.3L 6-cyl gasolineReference

International Harvester 4.6L 6-cyl dieselReference

International Harvester 4.3L 6-cyl LP gasReference

Fuel tank124.9 LReference

Fuel tank141.9 LReference

Engine70.8 kWReference

Plows6Reference

Drawbar (tested)52.4 kWReference

International Harvester C-263Reference

gasolineReference

6-cylinderReference

liquid-cooled vertical L-headReference

Displacement4.3 LReference

Bore/Stroke90 x 112 mmReference

Power70.8 kWReference

Air cleaneroil bathReference

Compression7.2:1Reference

Rated RPM2400Reference

Torque297.0 NmReference

Torque RPM1300Reference

Oil capacity8.5 LReference

Coolant capacity18.9 LReference

International Harvester D-282Reference

dieselReference

Displacement4.6 LReference

Bore/Stroke94 x 112 mmReference

Compression18.2:1Reference

Torque RPM1800Reference

Firing order1-5-3-6-2-4Reference

Coolant capacity21.8 LReference

LP gasReference

Compression8.75:1Reference

Torque287.5 NmReference

Torque RPM1200Reference

Coolant capacity19.9 LReference

Power at rated engine speed58.7 kWReference

Max power48.0 kWReference

Power at rated engine speed60.7 kWReference

Max power52.4 kWReference

Power at rated engine speed60.1 kWReference

Max power51.9 kWReference

Transmission

5-speedReference

10-speedReference

Transmissionsliding gearReference

Gears5 forward and 1 reverseReference

Oil capacity60.6 LReference

TransmissionTorque AmplifierReference

Gears10 forward and 2 reverseReference

The Torque Amplifier (TA) provides a clutchless shift-on-the-move between direct drive (DD) and the lower TA speed.Reference

PTO & Hydraulics

PTO (tested)60.7 kWReference

Valves1Reference

Total flow45.4 lpmReference

Total flow64.3 lpmReference

Steering flow9.5 lpmReference

Rear PTOindependentReference

Rear PTO Type540Reference

Dimensions

Wheelbase217 cmReference

Weight9635 to 9875 poundsReference

Front tire7.50-18Reference

Rear tire18.4/15-34Reference

Ag front7.50-18Reference

Ag rear18.4/15-34Reference

Industrial rear23.1/18-26Reference

Industrial rear16.9/14-34Reference

Length362 cmReference

Width198 cmReference

Height (steering wheel)187 cmReference

Ground clearance50 cmReference

Clearance (front axle)44 cmReference

Operating4370 kgReference

Operating4479 kgReference

Ballasted6919 kgReference

International Harvester 660 attachments

front-end loaderReference

660 Serial Number Location

Right side of clutch housingReference

660 Serial Numbers

1959501Reference

19603398Reference

19614259Reference

19625883Reference

19636995Reference

Final?Reference

FAQ: How to read a serial number table.Reference

Test results

NTTL 715: diesel TA 2WDReference

NTTL 721: gasoline TA 2WDReference

NTTL 722: LP gas TA 2WDReference

Diesel TA 2WDAugust 31 - September 5, 1959Link: Nebraska Tractor Test 715 fileReference

PTO performanceReference

Fuel use20.8 l/hourReference

Drawbar performanceReference

Fuel use19.7 l/hourReference

Max pull5010 kgReference

Gear 2-TA used for pull test.Reference

Gasoline TA 2WDOctober 1 - 12, 1959Link: Nebraska Tractor Test 721 fileReference

Fuel use24.2 l/hourReference

Fuel use23.8 l/hourReference

LP gas TA 2WDOctober 3 - 12, 1959Link: Nebraska Tractor Test 722 fileReference

Fuel use33.7 l/hourReference

Fuel use33.3 l/hourReference

Speeds

With 18.4/15-34 rear tires.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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