Compare/International Harvester 645 vs International Harvester 656

International Harvester 645 vs International Harvester 656

Verdict: International Harvester 645 vs International Harvester 656

The International Harvester 645 and the International Harvester 656 are both tractors — here is how they stack up on the figures that matter. International Harvester 645 leads on rated power with 66 hp against 64 hp. International Harvester 645 is the lighter machine (3,701 kg vs 5,800 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 645 is the newer design (1980 vs 1965). In short: choose the International Harvester 645 for outright pulling power, or the International Harvester 656 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

66 hp

64 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

International HarvesterReference

liquid-cooledReference

With 16.9-30 rear tires.Reference

Engine

49.2 kWReference

—

Displacement

3.4 LReference

4.6 LReference

Bore/Stroke

98 x 111 mmReference

90 x 112 mmReference

Power

49.2 kWReference

—

Rated RPM

2180Reference

2300 (late)Reference

Fuel tank

—

87.1 LReference

Plows

—

4-5Reference

Air cleaner

—

dryReference

Idle RPM

—

900-1800Reference

Oil capacity

—

8.5 LReference

Coolant capacity

—

19.9 LReference

Firing order

—

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

Compression

—

8.8:1Reference

PTO & Hydraulics

Rear Type

IIReference

PTO (claimed)

—

47.6 kWReference

Type

—

hydrostaticReference

Valves

—

0 to 2Reference

Pump flow

—

45.4 lpmReference

Control

—

lower-link draft sensingReference

Rear PTO

—

independentReference

Rear PTO Type

—

540/1000Reference

Dimensions

Weight

3701 kgReference

5800 to 6100 poundsReference

Length

352 cmReference

386 cmReference

Width

192 cmReference

187 cmReference

Height

225 cmReference

—

Wheelbase

—

203 cmReference

Front tire

—

7.50-16Reference

Rear tire

—

16.9-38Reference

Ag front

—

6.00-16 (Hi-Clear)Reference

Ag rear

—

15.5-38 (Hi-Clear)Reference

Height (steering wheel)

—

157 cmReference

Height (hood)

—

142 cmReference

Gas Shipping weight

—

2630 kgReference

Diesel Shipping weight

—

2766 kgReference

Clearance (front axle)

—

48 cmReference

Bar rear axle

—

69 mmReference

Front tread

—

137 to 213 cmReference

Rear tread

—

137 to 198 cmReference

Variants

2656

—

industrial tractorReference

IH 656

—

utility tractorReference

Farmall 656

—

row-crop tractorReference

656HC

—

high-clearReference

Transmission

Gears

—

infinite forward and reverse (2-range)Reference

Clutch

—

279.4mm cerametallic discReference

Transmission

—

Torque AmplifierReference

International Harvester 656 attachments

656 Serial Numbers

1966

—

7501 (IH)Reference

1967

—

7842 (IH)Reference

1968

—

9929 (IH)Reference

1969

—

11802 (IH)Reference

1970

—

13353 (IH)Reference

1971

—

14194 (IH)Reference

1972

—

14952 (IH)Reference

1973

—

15746 (IH)Reference

Location:

—

Clutch housing, right sideReference

Electrical

Charging system

—

alternatorReference

Charging amps

—

55Reference

Attachment overview

Speeds

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.