The LAST Of Gasoline Tractors - Diesel is King! - 1971 International Harvester 766 Tractor
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Years in Production / 1971–1976
International Harvester
766
Explore the specifications, hardware, and original references for the International Harvester 766.
No photo
88hp
Engine estimate · from PTO
2WD Only
Drive
1971–1976
Production years
International Harvester
Manufacturer
766 / 01
At a glance
Overview
1971 - 1976
66 Series
Row-Crop tractor
Production
Row-Crop tractor
Built in Rock Island, Illinois, USA
Original price was $13,400 in 1976
- Manufacturer
- International Harvester
- Total Built
- 10,799
Mechanical
Two-wheel drive
Power steering
Hydraulic dry disc brakes
Open operator station. Cab optional.
Hydraulics
- Type
- open center
- Pump Flow
- 12 gpm45.4 lpm
Hitch
- Rear Type
- 2
Pto
- Rear Pto
- independent
- Rear Type
- 540/1000
Serial Numbers
FAQ: How to read a serial number table.
- 1971
- 7101
- 1972
- 7416
- 1973
- 9611
- 1974
- 12378
- 1975
- 14630
- 1976
- 16840
766 / 02
Under the hood
Engine Detail (Option 1)
International Harvester C291
gasoline
6-cylinder
liquid-cooled
- Displacement
- 291 ci4.8 L
- Bore Stroke
- 3.75x4.39 inches95 x 112 mm
- Air Cleaner
- dual stage dry
- Rated Rpm
- 2400
- Starter Volts
- 12
- Fuel Type
- gasoline
- Cylinders
- 6
- Cooling
- liquid-cooled
Engine Detail (Option 2)
International Harvester D360
diesel
6-cylinder
liquid-cooled
- Displacement
- 360 ci5.9 L
- Bore Stroke
- 3.875x5.0625 inches98 x 129 mm
- Compression Ratio
- 17:1
- Rated Rpm
- 2400
- Starter Volts
- 12
- Fuel Type
- diesel
- Cylinders
- 6
- Cooling
- liquid-cooled
Engine Options
International Harvester 4.8L 6-cyl gasoline
International Harvester 5.9L 6-cyl diesel
- Fuel Tank
- 37 gal140.0 L
Engine Options
International Harvester 4.8L 6-cyl gasoline
International Harvester 5.9L 6-cyl diesel
766 / 03
Gears & controls
Transmission (Option 1)
Four gears (1-4) in low and high ranges.
- Transmission Type
- gear
- Gears
- 8 forward and 4 reverse
- Clutch
- dry disc
Transmission (Option 2)
Four gears (1-4) in two ranges (low/high) with the Torque Amplifer (TA) power shift. The TA allows a shift-on-the-move between direct drive and a lower speed.
- Transmission
- Torque Amplifier
- Transmission Type
- two-speed power shift
- Gears
- 16 forward and 8 reverse
- Clutch
- dry disc
Transmission Options
8-speed gear
16-speed two-speed power shift
766 / 04
Size. Stance. Footprint.
Dimensions
- Length
- 165 in419 cm
- Width
- 98 in248 cm
- Height
- 105 in266 cm
- Wheelbase
- 105 in266 cm
- Front tread
- 60 in152 cm
- Rear tread
- 56 in142 cm
Dimensions And Tires
- Wheelbase
- 105 inches266 cm
- Weight
- 10,300 lbs4672 kg
- Front Tire
- 9.5L-15
- Rear Tire
- 18.4-34
Serial Number Location
Left side of clutch housing
Tires And Tracks
- Front Ag
- 9.5L-15
- Rear Ag
- 18.4-34
See it in action
Videos
Watch International Harvester 766 videos from their original YouTube creators.
766 / 06
Tests (NTTL)
Tractor Tests
NTTL 1094: gasoline Torque Amplifier 2WD
NTTL 1117: diesel Torque Amplifier 2WD
Nebraska Tractor Test 1094
Gasoline Torque Amplifier 2WD4/20/1972
PTO performance
Drawbar performance
Gear 1-Hi-TA used for power test.
Gear 2-Lo-Direct used for pull test.
- Id
- 1094
- Power At Rated Engine Speed
- 79.73 hp59.5 kW
- Fuel Use
- 7.1 gal/hour26.9 l/hour
- Fuel Use
- 6.3 gal/hour23.8 l/hour
- Fuel Use
- 7.3 gal/hour27.6 l/hour
- Power At Rated Pto Speed
- 73.96 hp55.2 kW
- Max Power
- 71.32 hp53.2 kW
- Max Pull
- 8,841 lbs4010 kg
Nebraska Tractor Test 1117
Diesel Torque Amplifier 2WDNovember 10 - December 5, 1972
PTO performance
Drawbar performance
Gear 1-Hi-TA used for power test.
Gear 2-Lo-Direct used for pull test.
- Id
- 1117
- Power At Rated Engine Speed
- 85.45 hp63.7 kW
- Fuel Use
- 6.2 gal/hour23.5 l/hour
- Fuel Use
- 5.8 gal/hour22.0 l/hour
- Fuel Use
- 6.1 gal/hour23.1 l/hour
- Power At Rated Pto Speed
- 85.66 hp63.9 kW
- Max Power
- 73.37 hp54.7 kW
- Max Pull
- 9,236 lbs4189 kg