International Harvester A-766 Tractor

Manufacturer	International Harvester
Price	10,799(USD)
Model	A-766
Equipment Type	Row-Crop Tractors
Factory	Geelong, Australia

ENGINE DETAIL

The International Harvester A-766 features a robust D-310 diesel engine with a displacement of 5.1L and a high compression ratio of 16:1, ensuring strong torque and efficiency for heavy-duty applications. With a bore and stroke of 3.875x4.375 inches, it delivers optimal performance at a rated RPM of 2300, making it suitable for tasks requiring sustained power. However, the dual-stage dry air cleaner may necessitate regular maintenance to ensure optimal airflow and engine longevity, especially in dusty operational environments.

Description	International Harvester D-310 diesel 6-cylinder liquid-cooled
Displacement	310ci / 5.1L
Bore/Stroke	3.875x4.375inches / 98x 111mm
Air cleaner	dual stage dry
Compression	16:1
Rated RPM	2300
Starter volts	12

INTERNATIONAL HARVESTER A-766 ENGINE

The International Harvester A-766 features a robust 5.1L 6-cylinder diesel engine, providing a strong torque curve suitable for heavy-duty agricultural tasks. Its 37-gallon fuel tank offers extended operational range, ideal for long work hours in the field without frequent refueling. However, the weight of the tractor should be managed to prevent soil compaction during use on softer terrain.

Description	International Harvester 5.1L 6-cyl diesel
Fuel tank	37gal / 140.0L

TRANSMISSIONS OVERVIEW

The International Harvester A-766 tractor's 8-speed sliding gear transmission provides straightforward gear selection, suitable for general farming tasks, while the 16-speed partial power shift offers enhanced versatility for more complex operations, allowing for on-the-fly gear changes without clutching. This dual transmission setup can significantly improve productivity in varying field conditions, although it may require a learning curve for operators unaccustomed to power shift systems. Overall, the tractor's design is well-suited for both novice and experienced users, effectively balancing simplicity and advanced features.

Description

8-speed sliding gear 16-speed partial power shift

TRANSMISSION 1

The International Harvester A-766 tractor features an 8-speed forward and 4-speed reverse transmission, offering versatility for various tasks, particularly in agricultural applications requiring different speed settings. The sliding gear design enhances operational efficiency but can lead to increased wear if not properly maintained. Its dry disc clutch contributes to smoother engagement but may require more frequent adjustments compared to wet clutches, making regular maintenance essential for optimal performance.

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

TRANSMISSION 2

The International Harvester A-766 features a partial power shift transmission with 16 forward and 8 reverse gears, providing versatility in varying field conditions. The inclusion of a Torque Amplifier (TA) facilitates seamless shifting while on the move, enhancing operational efficiency during tasks that require frequent speed adjustments. However, the dry disc clutch may require more maintenance compared to wet clutches, particularly in heavy-duty applications where slippage could occur.

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

MECHANICAL

The International Harvester A-766 tractor features a 4x2 2WD chassis, which provides simplicity but may hinder performance on uneven terrain compared to 4WD models. Its hydrostatic power steering enhances maneuverability, making it easier to navigate tight spaces, while the hydraulic dry disc brakes ensure reliable stopping power for various applications. With an 8-speed sliding gear and an optional 16-speed partial power shift transmission, this tractor offers flexible gear selection, ideal for both fieldwork and transporting loads, although the absence of a cab may expose operators to harsh weather conditions.

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

HYDRAULICS

Type	open center
Pump flow	12gpm / 45.4lpm

TRACTOR HITCH

Rear Type

II

POWER TAKE-OFF (PTO)

Rear PTO	independent
Rear RPM	540/1000

INTERNATIONAL HARVESTER A-766 TIRES

The International Harvester A-766 tractor features a front tire size of 9.5L-15 and a larger rear tire size of 18.4-34, providing enhanced traction and stability for agricultural tasks. Its robust tire configuration is ideal for navigating varied terrains and optimizing weight distribution, which is essential for heavy-duty applications. However, be mindful of tire wear related to heavier loads, as improper inflation could lead to performance issues.

Ag front	9.5L-15
Ag rear	18.4-34

DIMENSIONS

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

DIMENSIONS & TIRES

The International Harvester A-766 tractor features a 102.7-inch wheelbase which provides stability and maneuverability, making it suitable for various agricultural tasks. With a weight of 10,300 lbs, it offers good traction for heavy-duty operations, but may be challenging in wet or soft ground conditions. The front tire size (9.5L-15) combined with the larger rear tires (18.4-34) enhances power transfer and load capability, ideal for plowing and hauling tasks.

Wheelbase	102.7inches / 260cm
Weight	10,300lbs / 4672kg
Front tire	9.5L-15
Rear tire	18.4-34

A-766 SERIAL NUMBERS

Location	Left side of clutch housing
1972	501
1973	1140
1974	1811
1975	2553
1976	3270
1977	3999
1978	4604
Final	4771

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