Compare/International Harvester 666 vs International Harvester 844-S

International Harvester 666 vs International Harvester 844-S

Verdict: International Harvester 666 vs International Harvester 844-S

The International Harvester 666 and the International Harvester 844-S are both tractors — here is how they stack up on the figures that matter. International Harvester 666 leads on rated power with 75 hp against 73 hp. International Harvester 666 is the lighter machine (6,780 kg vs 7,558 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 844-S is the newer design (1975 vs 1972). In short: choose the International Harvester 666 for outright pulling power, or the International Harvester 844-S 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

75 hp

73 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

International HarvesterReference

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

Four gears in each of two ranges, plus reverse.Reference

Total built

9,367Reference

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Original price

$11,875Reference

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Factories

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Saint Dizier, FranceReference

Final drives

—

planetaryReference

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

4.4 LReference

Bore/Stroke

95 x 112 mmReference

100 x 140 mmReference

Power (gross)

55.9 kWReference

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Fuel system

direct injectionReference

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Air cleaner

dual stage dryReference

dual dryReference

Compression

7.5:1Reference

16:1Reference

Rated RPM

2000Reference

2300Reference

Starter volts

12Reference

Coolant capacity

19.9 LReference

16.3 LReference

Power at rated engine speed

51.8 kWReference

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Max power

39.6 kWReference

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Engine

—

64.9 kWReference

Power

—

64.9 kWReference

Torque

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296.2 NmReference

Torque RPM

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1300Reference

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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29.1 LReference

Transmission

Torque-AmplifierReference

Agriomatic SReference

Gears

10 forward and 2 reverseReference

16 forward and 8 reverseReference

Clutch

dry discReference

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PTO & Hydraulics

PTO (claimed)

51.5 kWReference

54.4 kWReference

PTO (tested)

51.9 kWReference

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Type

two-speed power shiftReference

partial power shiftReference

Pump flow

45.4 lpmReference

29.9 lpmReference

Rear Type

IIReference

Rear PTO

independentReference

Rear PTO Type

540 (1.375)Reference

540/1000 (1.375)Reference

Power at rated PTO speed

48.8 kWReference

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Hydraulic system

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15.1 LReference

Capacity

—

15.1 LReference

Valves

—

1 or 2Reference

Rear lift

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3150 kgReference

Engine RPM

—

1000@2000Reference

Dimensions

Wheelbase

261 cmReference

238 cmReference

Weight

6780 to 7420 poundsReference

7558 to 8230 poundsReference

Front tire

7.50-16Reference

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

392 cmReference

Width

220 cmReference

204 cmReference

Height (steering wheel)

195 cmReference

182 cmReference

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

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Rear tread

127 to 243 cmReference

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2WD Rear tire

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15-34Reference

2WD Standard tires (ag)

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Front: 7.50-16. Rear: 15-34Reference

4WD Standard tires (ag)

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Front: 10.00-24. Rear: 15-34Reference

Height (exhaust)

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232 cmReference

2WD Weight

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3428 kgReference

4WD Weight

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3733 kgReference

2WD Ground clearance

—

50 cmReference

4WD Ground clearance

—

39 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

Battery volts

12Reference

Ground

—

negativeReference

Charging amps

—

28Reference

Test results

Fuel use

20.1 l/hourReference

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Max pull

3769 kgReference

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Capacities

Fuel

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84.8 LReference

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.