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International Harvester A-766

The International Harvester A-766 is a tractor produced by International Harvester. It is equipped with a 310 ci 5.1 L engine. The listed engine power is Diesel (listed): 98 hp / 73.1 kW. Transmission: Torque Amplifier. Operating weight: 10300 lbs 4672 kg.

Engine Power
Diesel (listed): 98 hp / 73.1 kW
Fuel & Capacities
37 gal 140.0 L
Transmission
Torque Amplifier
Operating Weight
10300 lbs 4672 kg

Overview

International Harvester A-766 tractor photo
1972 - 1978 66A SeriesRow-Crop tractor 66A Series Row-Crop tractor
Production
Manufacturer
International Harvester
Row-Crop tractor
Built in Geelong, Australia
International Harvester A-766 Engine
International Harvester 5.1L 6-cyl diesel
Fuel tank
37 gal 140.0 L
Engine details ...
International Harvester A-766 Power
Engine
98 hp 73.1 kW
PTO (claimed)
80 hp 59.7 kW
Mechanical
Two-wheel drive
Final drives
spur gear
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
II
Power Take-off (PTO)
Rear PTO
independent
Rear PTO Type
540/1000
Dimensions & Tires
Wheelbase
104.8 inches 266 cm
Weight
10300 lbs 4672 kg
Front tire
9.5L-15
Rear tire
18.4-34
Full dimensions and tires ...
References
A-766 references literature
International Harvester Australia: Geelong Works by Sarah Tomac*
International Harvester Tractors & Equipment in Australia & New Zealand by Graeme Quick
Technical Annual published in 1977, by Power Farming
696 & 766 Tractors published in 1972, by International Harvester
*Publication contains known errors.

Engine

Engine Detail — 310 ci / 5.1 L Diesel

Manufacturer
International Harvester D-310
Fuel Type
Diesel
Configuration
6-cylinder, liquid-cooled inline
Displacement
310 ci 5.1 L
Bore/Stroke
3.875x4.375 inches 98 x 111 mm
Power
98 hp 73.1 kW
Air cleaner
dual stage dry
Compression
16:1
Rated RPM
2300
Torque
248 lb-ft 336.3 Nm
Torque RPM
1600
Starter
electric
Starter volts
12

Transmission

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

Transmission — 8 forward and 4 reverse sliding gear

Type
sliding 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 Amplifier (TA) power shift. The TA allows a shift-on-the-move between direct drive and a lower speed.

Dimensions

International Harvester A-766 Tires
Ag front
9.5L-15
Ag rear
18.4-34
Dimensions
Wheelbase
104.8 inches 266 cm
Length
155.8 inches 395 cm
Width
91 inches 231 cm
Height (steering wheel)
84.7 inches 215 cm
Operating weight
10300 lbs 4672 kg
Ballasted weight
11880 lbs 5388 kg
Front tread
60 to 84 inches 152 to 213 cm
Rear tread
56 to 100 inches 142 to 254 cm

Photos

International A-766, right side.

International A-766, right side.

International A-766, left side.

International A-766, left side.

Recommended Implements & Sizing Guide

Engineering recommendations for International Harvester A-766 based on its 98 HP power envelope and ASAE agricultural standards.

Implement & OperationRecommended SizeWorkload RatingEngineering Notes
Moldboard PlowPrimary Tillage
4 to 5 Bottom (16-18")4 - 5 铧 (40-45 cm)Heavy DutyHeavy primary tillage; semi-mounted hitch recommended.
Rotary Cutter / MowerMowing & Clearing
10 to 12 ft Flex-Wing3.0 - 3.6 m 折叠双翼Heavy DutyWide swath pasture and crop residue shredding.
Rotary TillerSeedbed Prep
78 to 84 in200 - 215 cmHeavy DutyHeavy 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 DutyAggressive residue cutting in corn/cotton stubble.
Hay BalerHay & Forage
5x6 Round Baler or 3x3 Mid Square1.5x1.8 m 大圆捆或中型方捆机Heavy DutyHigh density baling; requires minimum 85 PTO HP.
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 A-766.

Estimated Continuous Field Runtime: 7.3 hrs

Approximately 7.3 hours of continuous field operation at ~75% rated power on a full tank (37 gal / 140.1 L).

Estimated 75% Load Fuel Burn~5.1 gal/hr (19.3 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

International Harvester A-766 Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for International Harvester A-766.

Converted Equivalents:

Horsepower (HP)98 hp
Kilowatts (kW)73.1 kW
Metric Horsepower (PS / CV)99.4 PS

Direct Competitor Comparison

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