International Harvester 766

The International Harvester 766 is a tractor produced by International Harvester. It is equipped with a 360 ci 5.9 L engine. The listed engine power is 85.45 hp 63.7 kW. Transmission: Torque Amplifier. Operating weight: 10,300 lbs 4672 kg.

Engine Power

85.45 hp 63.7 kW

Fuel & Capacities

Diesel

Transmission

Torque Amplifier

Operating Weight

10,300 lbs 4672 kg

Overview

	1971 - 1976 66 SeriesRow-Crop tractor 66 Series Row-Crop tractor

Production
Manufacturer	International Harvester
Row-Crop tractor
Built in Rock Island, Illinois, USA
Total built	10,799
Original price was $13,400 in 1976

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

Mechanical
Two-wheel drive
Power steering
Hydraulic dry disc brakes
Open operator station. Cab optional.

Hydraulics
Type	open center
Pump flow	12 gpm 45.4 lpm

Tractor hitch
Rear Type	2

Power Take-off (PTO)
Rear PTO	independent
Rear PTO Type	540/1000

Dimensions & Tires
Wheelbase	105 inches 266 cm
Weight	10,300 lbs 4672 kg
Front tire	9.5L-15
Rear tire	18.4-34
Full dimensions and tires ...

References

766, 966, 1066 and 1466 Tractors published in 1972, by International Harvester
766, 966, 1066 and 1466 Tractors published in 1973, by International Harvester

Engine

Engine options
International Harvester 4.8L 6-cyl gasoline
International Harvester 5.9L 6-cyl diesel

Engine Detail — 291 ci / 4.8 L Gasoline

Manufacturer	International Harvester C291
Fuel Type	Gasoline
Configuration	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 — 360 ci / 5.9 L Diesel

Manufacturer	International Harvester D360
Fuel Type	Diesel
Configuration	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

Transmission

Transmission options
8-speed gear
16-speed two-speed power shift

Transmission — 8 forward and 4 reverse gear

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

Transmission — Torque Amplifier

Transmission	Torque Amplifier
Type	two-speed 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.

Dimensions

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

Dimensions
Wheelbase	105 inches 266 cm
Length	165 inches 419 cm
Width	98 inches 248 cm
Height (exhaust)	105 inches 266 cm
Operating weight	10,300 lbs 4672 kg
Ballasted weight	11,880 lbs 5388 kg
Clearance (drawbar)	14 inches 35 cm
Front tread	60 to 84 inches 152 to 213 cm
Rear tread	56 to 100 inches 142 to 254 cm

Tests

Tractor Tests
NTTL 1094: gasoline Torque Amplifier 2WD
NTTL 1117: diesel Torque Amplifier 2WD

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
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.

Photos

1976 black-stripe International 766

International 766

Recommended Implements & Sizing Guide

Engineering recommendations for International Harvester 766 based on its 85.45 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	3 to 4 Bottom (16")3 - 4 铧 (40 cm)	Heavy Duty	Suitable for medium loam and stubble turnover.
Rotary Cutter / MowerMowing & Clearing	7 to 8 ft (84-96 in)2.1 - 2.4 m	Heavy Duty	Heavy-duty twin spindle cutter for overgrown acreage.
Rotary TillerSeedbed Prep	78 to 84 in200 - 215 cm	Heavy Duty	Heavy commercial tiller with multi-speed gearbox.
Disc HarrowSecondary Tillage	10 to 14 ft Tandem / Offset3.0 - 4.2 m 重型交错耙	Heavy Duty	Aggressive residue cutting in corn/cotton stubble.
Hay BalerHay & Forage	4x4 to 4x5 Round Baler1.2x1.5 m 紧凑圆捆机	Heavy Duty	Silage and dry hay; 540 RPM PTO with slip-clutch.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for International Harvester 766.

Estimated Continuous Field Runtime: 1.4 hrs

Approximately 1.4 hours of continuous field operation at ~75% rated power on a full tank (6.1 gal / 23.1 L).

Estimated 75% Load Fuel Burn~4.4 gal/hr (16.8 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours