Farmall 666

Farmall 666 tractor photo
1972 - 1976
Row-Crop tractor

Note: the Farmall model 666 is the same as the International Harvester 666. The following data is from the 666 listing.
ManufacturerFarmall (a part of International Harvester)
Row-Crop tractor
Built in Rock Island, Illinois, USA
Total built9,367
Original price$11,875
Farmall 666 Engines
International Harvester 5.1L 6-cyl diesel
International Harvester 4.8L 6-cyl gasoline
Gas Fuel tank33 gal
124.9 L
Diesel Fuel tank31 gal
117.3 L
Engine details ...
Farmall 666 Transmissions
10-speed two-speed power shift
Transmission details ...
Farmall 666 Power
Engine (gross)75 hp
55.9 kW
Drawbar (claimed)57 hp (gear)
42.5 kW
 54 hp (hydro)
40.3 kW
PTO (claimed)65 hp (gear)
48.5 kW
 69 hp (hydro)
51.5 kW
Drawbar (tested)58.01 hp
43.3 kW
PTO (tested)69.61 hp
51.9 kW
Performance test details ...
Two-wheel drive
Power steering
Dry disc brakes
Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning.
Typeopen center
Pump flow12 gpm
45.4 lpm
Tractor hitch
Rear TypeII
TypeIH Fast Hitch
Power Take-off (PTO)
Rear PTOindependent
Rear PTO Type540 (1.375)
Dimensions & Tires
Wheelbase103 inches
261 cm
Weight6780 to 7420 pounds
Front tire7.50-16
Rear tire15.5-38
Full dimensions and tires ...
666 Serial Numbers
Location:Clutch housing, right side

FAQ: How to read a serial number table.
Charging systemalternator
Battery volts12
666 references literature
Farm Equipment Reference Catalog published in 1972, by International Harvester
Page information
Peter Easterlund - owner of
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TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999.
Peter Easterlund - owner/author
Updated on February 6, 2024
©2000-2024 -®. Notice: Every attempt is made to ensure the data listed is accurate. However, differences between sources, incomplete listings, errors, and data entry mistakes do occur. Consult official literature from the manufacturer before attempting any service or repair.