Search
International Harvester 645 vs International Harvester 686
Verdict: International Harvester 645 vs International Harvester 686
The International Harvester 645 and the International Harvester 686 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 66 hp. International Harvester 686 is the lighter machine (3,524 kg vs 3,701 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 1976). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
Tune the fit score
Tell us about your operation
Fit & specs
International Harvester
62
Fit score
Best match
Clear
International Harvester
62
Fit score
Best match
Clear
Rated power
66 hp
66 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
International HarvesterReference
International HarvesterReference
liquid-cooledReference
With 15.5-38 rear tires.Reference
Total built
—
6,000Reference
Engine
Engine
49.2 kWReference
—
Displacement
3.4 LReference
4.8 LReference
Bore/Stroke
98 x 111 mmReference
95 x 112 mmReference
Power
49.2 kWReference
—
Rated RPM
2180Reference
2000Reference
Drawbar (tested)
—
43.3 kWReference
Starter volts
—
12Reference
Air cleaner
—
dryReference
Idle RPM
—
900-2000Reference
Oil capacity
—
60.6 LReference
Coolant capacity
—
19.9 LReference
Power at rated engine speed
—
49.5 kWReference
Max power
—
43.0 kWReference
PTO & Hydraulics
Rear Type
IIReference
IIReference
PTO (tested)
—
49.5 kWReference
Hydraulic system
—
60.6 LReference
Type
—
two-speed power shiftReference
Capacity
—
60.6 LReference
Total flow
—
45.4 lpmReference
Rear PTO
—
independentReference
Rear PTO Type
—
540 (1.375)Reference
Dimensions
Weight
3701 kgReference
3524 kgReference
Length
352 cmReference
411 cmReference
Width
192 cmReference
227 cmReference
Height
225 cmReference
—
Wheelbase
—
261 cmReference
Front tire
—
7.50-16Reference
Rear tire
—
15.5-38Reference
Ag front
—
7.50-16Reference
Ag rear
—
15.5-38Reference
Height (exhaust)
—
266 cmReference
Diesel Shipping weight
—
3524 kgReference
Ballasted weight
—
4690 kgReference
Front tread
—
147 to 208 cmReference
Rear tread
—
142 to 243 cmReference
Transmission
Transmission
—
Torque AmplifierReference
Gears
—
10 forward and 2 reverseReference
Capacities
Fuel
—
117.3 LReference
686 Serial Numbers
1976
—
7500Reference
1977
—
7729Reference
1978
—
9899Reference
1979
—
11417Reference
1980
—
12923Reference
Location:
—
Clutch housing on right side.Reference
Test results
Fuel use
—
15.5 l/hourReference
Max pull
—
3634 kgReference
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.