International Harvester 766 tractor specifications

1971 - 1976

1971 - 1976 66 SeriesRow-Crop tractor

Production

Production Manufacturer:International Harvester
Type:Row-Crop tractor
Factory:Rock Island, Illinois, USA
Total built:10,799
Original price:$13,400 (1976)

International Harvester 766 Power

International Harvester 766 Power Drawbar (tested):73.37 hp
54.7 kW
PTO (tested):85.45 hp
63.7 kW
power test details ...

1971 - 1976

66 Series

Row-Crop tractor

Nebraska Tractor Test 1094

Nebraska Tractor Test 1094
Gasoline Torque Amplifier 2WD 4/20/1972 Link: Nebraska Tractor Test 1094 file
PTO performance
Power at rated engine speed:	79.73 hp 59.5 kW
Fuel use:	7.1 gal/hour 26.9 l/hour
Power at rated PTO speed:	73.96 hp 55.2 kW
Fuel use:	6.3 gal/hour 23.8 l/hour
Drawbar performance
Max power:	71.32 hp 53.2 kW
Fuel use:	7.3 gal/hour 27.6 l/hour
Gear 1-Hi-TA used for power test.
Max pull:	8,841 lbs 4010 kg
Gear 2-Lo-Direct used for pull test.

Nebraska Tractor Test 1117

Nebraska Tractor Test 1117
Diesel Torque Amplifier 2WD November 10 - December 5, 1972 Link: Nebraska Tractor Test 1117 file
PTO performance
Power at rated engine speed:	85.45 hp 63.7 kW
Fuel use:	6.2 gal/hour 23.5 l/hour
Power at rated PTO speed:	85.66 hp 63.9 kW
Fuel use:	5.8 gal/hour 22.0 l/hour
Drawbar performance
Max power:	73.37 hp 54.7 kW
Fuel use:	6.1 gal/hour 23.1 l/hour
Gear 1-Hi-TA used for power test.
Max pull:	9,236 lbs 4189 kg
Gear 2-Lo-Direct used for pull test.

International Harvester 766 Engines

International Harvester 766 Engines International Harvester 4.8L 6-cyl gasoline International Harvester 5.9L 6-cyl diesel Fuel tank:37 gal
140.0 L
Engine details ...

1971 - 1976

66 Series

Row-Crop tractor

Engines overview

Engines overview
International Harvester 4.8L 6-cyl gasoline
International Harvester 5.9L 6-cyl diesel

Engine Detail

Engine Detail
International Harvester C291
gasoline
6-cylinder
liquid-cooled
Displacement:	291 ci 4.8 L
Bore/Stroke:	3.75x4.39 inches 95 x 112 mm
Air cleaner:	dual stage dry
Rated RPM:	2400
Starter volts:	12

Engine Detail

Engine Detail
International Harvester D360
diesel
6-cylinder
liquid-cooled
Displacement:	360 ci 5.9 L
Bore/Stroke:	3.875x5.0625 inches 98 x 129 mm
Compression:	17:1
Rated RPM:	2400
Starter volts:	12

Mechanical

Mechanical Chassis:4x2 2WD
Steering:hydrostatic power
Brakes:hydraulic dry disc
Cab:Open operator station. Cab optional.
Transmissions:8-speed sliding gear
16-speed partial power shift
Transmission details ...

1971 - 1976

66 Series

Row-Crop tractor

Transmissions overview

Transmissions overview
8-speed sliding gear
16-speed partial power shift

Transmission

Transmission
Type:	sliding gear
Gears:	8 forward and 4 reverse
Clutch:	dry disc
Four gears (1-4) in low and high ranges.

Transmission

Transmission
Transmission:	Torque Amplifier
Type:	partial power shift
Gears:	16 forward and 8 reverse
Clutch:	dry disc
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.

Hydraulics

Hydraulics Type:open center
Pump flow:12 gpm
45.4 lpm

Tractor hitch

Tractor hitch Rear Type:2

Power Take-off (PTO)

Power Take-off (PTO) Rear PTO:independent
Rear RPM:540, 1000

Dimensions & Tires

Dimensions & Tires Wheelbase:102.7 inches
260 cm
Weight:10,300 lbs
4672 kg
Front tire:9.5L-15
Rear tire:18.4-34
Full dimensions and tires ...

1971 - 1976

66 Series

Row-Crop tractor

International Harvester 766 Tires

International Harvester 766 Tires
Ag front:	9.5L-15
Ag rear:	18.4-34

Dimensions

Dimensions
Wheelbase:	102.7 inches 260 cm
Operating weight:	10,300 lbs 4672 kg
Ballasted weight:	11,880 lbs 5388 kg
Front tread:	60 to 84 inches 152 to 213 cm
Rear tread:	56 to 100 inches 142 to 254 cm

766 Serial Numbers

766 Serial Numbers Location:Left side of clutch housing
photo of 766 serial number
1971:7101
1972:7416
1973:9611
1974:12378
1975:14630
1976:16840

how to read serial numbers...