Tractor · 1972Unverified
Farmall 666
Farmall 666 — Row-Crop tractor · 75 hp. Reference specifications; pending source verification.
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
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.