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Tractor · 1972Unverified

Farmall 666

Name: Farmall 666
Brand: Farmall

Farmall 666 — Row-Crop tractor · 75 hp. Reference specifications; pending source verification.

The Farmall 666 is a tractor model with an output of 75 hp, placing it within the middle range of power for its class. Manufactured between 1972 and 1976, this model features a 6-cylinder diesel liquid-cooled engine, transmitting power to the wheels through a hydrostatic transmission in a two-wheel drive configuration. The listed weight of the tractor is between 6780 and 7420 pounds. It is intended for use on land areas of approximately 200 acres.

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

Rated power

75 hp

Max power

43.3 kW

Weight

6780 to 7420 pounds

Catalogue coverage

Variants represented

Richest spec table

115 rows

Recorded power

75 hp

Recorded weight

3075 kg

Transmissions

5-speed

Production years

1972-1976

Verified variants

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

Hover a source tag to verify

Overview

ManufacturerFarmall (a part of International Harvester)Reference

Row-Crop tractorReference

Built in Rock Island, Illinois, USAReference

Total built9,367Reference

Original price$11,875Reference

Two-wheel driveReference

Power steeringReference

Dry disc brakesReference

Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning.Reference

Engine

International Harvester 5.1L 6-cyl dieselReference

International Harvester 4.8L 6-cyl gasolineReference

Gas Fuel tank124.9 LReference

Diesel Fuel tank117.3 LReference

Engine (gross)55.9 kWReference

Drawbar (claimed)42.5 kWReference

Drawbar (claimed)40.3 kWReference

Drawbar (tested)43.3 kWReference

International Harvester D312Reference

dieselReference

6-cylinderReference

liquid-cooledReference

Displacement5.1 LReference

Bore/Stroke98 x 112 mmReference

Power (gross)55.9 kWReference

Fuel systemdirect injectionReference

Air cleanerdual stage dryReference

Compression17:1Reference

Rated RPM2000Reference

Starter volts12Reference

Coolant capacity19.9 LReference

International Harvester C291Reference

gasolineReference

Displacement4.8 LReference

Bore/Stroke95 x 112 mmReference

Compression7.5:1Reference

Power at rated engine speed49.4 kWReference

Max power43.3 kWReference

Power at rated engine speed49.4 kWReference

Max power42.7 kWReference

Power at rated engine speed51.9 kWReference

Max power40.2 kWReference

Power at rated engine speed51.8 kWReference

Max power39.6 kWReference

Transmission

5-speedReference

hydrostaticReference

10-speed two-speed power shiftReference

Transmissionsliding gearReference

Gears5 forward and 1 reverseReference

TypehydrostaticReference

Gearsinfinite forward and reverseReference

TransmissionTorque-AmplifierReference

Typetwo-speed power shiftReference

Gears10 forward and 2 reverseReference

Clutchdry discReference

PTO & Hydraulics

PTO (claimed)48.5 kWReference

PTO (claimed)51.5 kWReference

PTO (tested)51.9 kWReference

Typeopen centerReference

Pump flow45.4 lpmReference

Rear TypeIIReference

TypeIH Fast HitchReference

Rear PTOindependentReference

Rear PTO Type540 (1.375)Reference

Power at rated PTO speed47.8 kWReference

Power at rated PTO speed48.8 kWReference

Dimensions

Wheelbase261 cmReference

Weight6780 to 7420 poundsReference

Front tire7.50-16Reference

Rear tire15.5-38Reference

Ag front7.50-16Reference

Ag rear15.5-38Reference

Length408 cmReference

Width220 cmReference

Height (steering wheel)195 cmReference

Shipping weight3075 kgReference

Shipping weight3365 kgReference

Clearance (front axle)53 cmReference

Clearance (drawbar)35 cmReference

Front tread127 to 187 cmReference

Front tread142 to 203 cmReference

Rear tread127 to 243 cmReference

666 Serial Numbers

Location:Clutch housing, right sideReference

19727500Reference

19738200Reference

197411585Reference

197513131Reference

197615739Reference

FAQ: How to read a serial number table.Reference

Electrical

Charging systemalternatorReference

Battery volts12Reference

Test results

NTTL 1151: 312 diesel Torque Amplifier 2WDReference

NTTL 1152: gasoline Torque Amplifier 2WDReference

NTTL 1154: gasoline hydrostatic 2WDReference

NTTL 1155: diesel hydrostatic 2WDReference

312 diesel Torque Amplifier 2WDNovember 3 - 14, 1973Link: Nebraska Tractor Test 1151 fileReference

PTO performanceReference

Fuel use17.8 l/hourReference

Drawbar performanceReference

Fuel use17.4 l/hourReference

Gear 3-Direct used for power test.Reference

Max pull3634 kgReference

Gear 2-TA used for pull test.Reference

Gasoline Torque Amplifier 2WDNovember 5 - December 3, 1973Link: Nebraska Tractor Test 1152 fileReference

Fuel use45.4 l/hourReference

Fuel use21.6 l/hourReference

Max pull3620 kgReference

Gasoline hydrostatic 2WDNovember 14 - December 3, 1973Link: Nebraska Tractor Test 1154 fileReference

Fuel use26.1 l/hourReference

Fuel use22.0 l/hourReference

Fuel use29.1 l/hourReference

Max pull3822 kgReference

Diesel hydrostatic 2WDNovember 14 - December 3, 1973Link: Nebraska Tractor Test 1155 fileReference

Fuel use21.2 l/hourReference

Fuel use20.1 l/hourReference

Max pull3769 kgReference

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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