International Harvester 966 Tractor

The International Harvester 966 is a 1971-1976 66 Series row-crop tractor with a 6.8L diesel six-cylinder and 95 hp claimed PTO power. It is a capable 2WD or optional 4WD tractor for substantial drawbar, hydraulic, and PTO work.

International Harvester 966 specifications

What the 966 is used for

The 966 is suited to heavy hay, tillage, planting, and PTO work that calls for a roughly 95 hp PTO tractor. Its open-center hydraulic system and available multiple remote valves support period-appropriate hydraulic implements.

Choose the transmission and drive configuration around the intended work. Gear-drive, two-speed powershift, and hydrostatic versions are distinct machines in operation and inspection needs, and the 4WD option affects capability and maintenance.

Why the International Harvester 966 stands out

The 966 pairs a 6.8L diesel with a claimed 95 hp PTO rating and a choice of three transmission types. It also offers independent 540/1000 rpm PTO, power steering, optional 4WD, and an optional heated and air-conditioned cab.

Buying a used International Harvester 966

Verify whether the tractor is gear-drive, two-speed powershift, or hydrostatic and test that system fully when warm. Inspect the torque-amplifier operation where applicable, hydraulic remote and steering performance, PTO engagement, brake response, cab equipment if fitted, and the diesel engine for cooling-system or fuel-system issues.

International Harvester 966 frequently asked questions

How much PTO horsepower does an International 966 have?

It has 95 hp claimed PTO power; TractorData reports 100.80 hp tested PTO power.

What engine is in an International 966?

It uses an International Harvester 6.8L six-cylinder diesel engine.

Did the IH 966 have four-wheel drive?

Yes. It was available in two-wheel-drive or optional four-wheel-drive form.

Specifications are commonly cited figures for general reference; exact figures vary by year and serial number, so confirm against TractorData.com and the machine's records. Values and prices of used tractors vary by condition and region. Page updated Aug 4, 2026.

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