Compare/International Harvester 666 vs International Harvester 824

International Harvester 666 vs International Harvester 824

Verdict: International Harvester 666 vs International Harvester 824

The International Harvester 666 and the International Harvester 824 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 75 hp. International Harvester 666 is the lighter machine (6,780 kg vs 6,934 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 666 holds more fuel (124.9 L vs 70.0 L) for longer stints between fills. International Harvester 666 is the newer design (1972 vs 1971). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer 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

75 hp

Confidence

40%

Guide price

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Overview

Manufacturer

International HarvesterReference

Diesel hydrostatic 2WDNovember 14 - December 3, 1973Link: Nebraska Tractor Test 1155 fileReference

The Agriomatic S provides an additional four forward speeds selected by a right-hand power shift lever. Pushing the lever forward engages the Agriomatic range, while rearward uses the conventional range. The Agriomatic speeds are between high and low ranges, so this provides an undershift in high range and an overshift in low range. In reverse range it operates as a power shuttle.Reference

Total built

9,367Reference

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Original price

$11,875Reference

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Engine

Gas Fuel tank

124.9 LReference

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Diesel Fuel tank

117.3 LReference

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Engine (gross)

55.9 kWReference

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Drawbar (claimed)

40.3 kWReference

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Drawbar (tested)

43.3 kWReference

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Displacement

4.8 LReference

3.9 LReference

Bore/Stroke

95 x 112 mmReference

98 x 129 mmReference

Power (gross)

55.9 kWReference

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Fuel system

direct injectionReference

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Air cleaner

dual stage dryReference

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Compression

7.5:1Reference

16:1Reference

Rated RPM

2000Reference

2300Reference

Starter volts

12Reference

Coolant capacity

19.9 LReference

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Power at rated engine speed

51.8 kWReference

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Max power

39.6 kWReference

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Fuel tank

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70.0 LReference

Engine

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55.9 kWReference

Power

—

55.9 kWReference

Torque

—

257.9 NmReference

Torque RPM

—

1500Reference

Firing order

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1-3-4-2Reference

Starter power

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3.0 kWReference

Oil capacity

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9.1 LReference

Oil change

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200 hReference

Transmission

Torque-AmplifierReference

Agriomatic SReference

Gears

10 forward and 2 reverseReference

12 forward and 4 reverseReference

Clutch

dry discReference

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PTO & Hydraulics

PTO (claimed)

51.5 kWReference

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PTO (tested)

51.9 kWReference

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Type

two-speed power shiftReference

partial power shiftReference

Pump flow

45.4 lpmReference

28.4 lpmReference

Rear Type

IIReference

Rear PTO

independentReference

Rear PTO Type

540 (1.375)Reference

540/1000Reference

Power at rated PTO speed

48.8 kWReference

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Control

—

position and draft controlReference

Rear lift

—

2700 kgReference

Dimensions

Wheelbase

261 cmReference

212 cmReference

Weight

6780 to 7420 poundsReference

6934 to 7596 poundsReference

Front tire

7.50-16Reference

7.50-18Reference

Rear tire

15.5-38Reference

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Ag front

7.50-16Reference

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Ag rear

15.5-38Reference

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Length

408 cmReference

355 cmReference

Width

220 cmReference

198 cmReference

Height (steering wheel)

195 cmReference

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Shipping weight

3365 kgReference

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Clearance (front axle)

53 cmReference

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Clearance (drawbar)

35 cmReference

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Bar rear axle

69 mmReference

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Front tread

142 to 203 cmReference

132 to 172 cmReference

Rear tread

127 to 243 cmReference

146 to 186 cmReference

2WD Rear tire

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13.6-38Reference

2WD Standard tires (ag)

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Front: 7.50-18. Rear: 13.6-38Reference

4WD Standard tires (ag)

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Front: 11.2-24. Rear: 16.9-34Reference

Height

—

181 cmReference

2WD Weight

—

3145 kgReference

4WD Weight

—

3445 kgReference

Ground clearance

—

38 cmReference

666 Serial Numbers

1972

7500Reference

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1973

8200Reference

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1974

11585Reference

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1975

13131Reference

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1976

15739Reference

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Location:

Clutch housing, right sideReference

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Electrical

Charging system

alternatorReference

Bosch generatorReference

Battery volts

12Reference

Charging amps

—

16Reference

Batteries

—

1 (12V)Reference

Test results

Fuel use

20.1 l/hourReference

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Max pull

3769 kgReference

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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.