Compare/International Harvester 660 vs International Harvester 766

International Harvester 660 vs International Harvester 766

Verdict: International Harvester 660 vs International Harvester 766

The International Harvester 660 and the International Harvester 766 are both tractors — here is how they stack up on the figures that matter. International Harvester 766 leads on rated power with 80 hp against 79 hp. International Harvester 766 is the lighter machine (4,672 kg vs 9,635 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 766 holds more fuel (140.0 L vs 124.9 L) for longer stints between fills. International Harvester 766 is the newer design (1971 vs 1959). In short: choose the International Harvester 766 for outright pulling power, or the International Harvester 660 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

International Harvester

Fit score

Best match

Clear

International Harvester

Fit score

Best match

Clear

Rated power

79 hp

80 hp

Confidence

40%

Guide price

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Overview

Manufacturer

International HarvesterReference

The Torque Amplifier (TA) provides a clutchless shift-on-the-move between direct drive (DD) and the lower TA speed.Reference

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.Reference

Total built

6,945Reference

10,799Reference

Original price

$6,000 (1963)Reference

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Steering

hydrostatic power optionalReference

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Engine

Fuel tank

141.9 LReference

140.0 LReference

Engine

70.8 kWReference

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Plows

6Reference

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Drawbar (tested)

52.4 kWReference

54.7 kWReference

Displacement

4.6 LReference

5.9 LReference

Bore/Stroke

94 x 112 mmReference

98 x 129 mmReference

Power

70.8 kWReference

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Air cleaner

oil bathReference

dual stage dryReference

Compression

8.75:1Reference

17:1Reference

Rated RPM

2400Reference

Torque

287.5 NmReference

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Torque RPM

1200Reference

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Oil capacity

60.6 LReference

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Coolant capacity

19.9 LReference

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Firing order

1-5-3-6-2-4Reference

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Power at rated engine speed

60.1 kWReference

63.7 kWReference

Max power

51.9 kWReference

54.7 kWReference

Starter volts

—

12Reference

Transmission

Torque AmplifierReference

Gears

10 forward and 2 reverseReference

16 forward and 8 reverseReference

Clutch

—

dry discReference

PTO & Hydraulics

PTO (tested)

60.7 kWReference

63.7 kWReference

Valves

1Reference

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Total flow

64.3 lpmReference

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Steering flow

9.5 lpmReference

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Rear PTO

independentReference

Rear PTO Type

540Reference

540/1000Reference

Type

—

two-speed power shiftReference

Pump flow

—

45.4 lpmReference

Rear Type

—

2Reference

Power at rated PTO speed

—

63.9 kWReference

Dimensions

Wheelbase

217 cmReference

266 cmReference

Weight

9635 to 9875 poundsReference

4672 kgReference

Front tire

7.50-18Reference

9.5L-15Reference

Rear tire

18.4/15-34Reference

18.4-34Reference

Ag front

7.50-18Reference

9.5L-15Reference

Ag rear

18.4/15-34Reference

18.4-34Reference

Industrial rear

16.9/14-34Reference

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Length

362 cmReference

419 cmReference

Width

198 cmReference

248 cmReference

Height (steering wheel)

187 cmReference

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Ground clearance

50 cmReference

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Clearance (front axle)

44 cmReference

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Operating

4479 kgReference

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Ballasted

6919 kgReference

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Height (exhaust)

—

266 cmReference

Operating weight

—

4672 kgReference

Ballasted weight

—

5388 kgReference

Clearance (drawbar)

—

35 cmReference

Bar rear axle

—

82 mmReference

Front tread

—

152 to 213 cmReference

Rear tread

—

142 to 254 cmReference

International Harvester 660 attachments

660 Serial Number Location

660 Serial Numbers

1959

501Reference

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1960

3398Reference

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1961

4259Reference

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1962

5883Reference

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1963

6995Reference

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Final

?Reference

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Test results

Fuel use

33.3 l/hourReference

23.1 l/hourReference

Max pull

5010 kgReference

4189 kgReference

Speeds

766 Serial Number Location

766 Serial Numbers

1971

—

7101Reference

1972

—

7416Reference

1973

—

9611Reference

1974

—

12378Reference

1975

—

14630Reference

1976

—

16840Reference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.