Head to head · Utility

International Harvester 666 vs International Harvester 686

Image not recorded
International HarvesterModel A

International Harvester 666

Utility

power
Not recorded
displacement
312 ci
Cylinders
6
Forward gears
5
Full 666 specs
Image not recorded
International HarvesterModel B

International Harvester 686

Utility

power
Not recorded
displacement
310 ci
Cylinders
6
Forward gears
10
Full 686 specs
International HarvesterInternational Harvester 666
vs
International HarvesterInternational Harvester 686

How they compare

Headline specs vs. the whole Utility

n = 4,941–5,720

Engine Displacement

▲ 666 higher · +2 ci (<1%)
666312 ci
686310 ci
Median Utility Tractor183 ci

666 is in the 85th percentile; 686 is in the 85th · 5,580 models

Cylinders

= Effectively tied
6666
6866
Median Utility Tractor4

666 is in the 93rd percentile; 686 is in the 93rd · 5,720 models

Forward Gears

▲ 686 higher · +5 (+100%)
6665
68610
Median Utility Tractor12

666 is in the 6th percentile; 686 is in the 39th · 4,941 models

Operating Weight

▲ 686 higher · +717 lb (+10%)
6667,053 lb
6867,770 lb
Median Utility Tractor5,303 lb

666 is in the 67th percentile; 686 is in the 74th · 5,107 models

666 (A)686 (B)Median Utility Tractor

Full comparison

Every spec, side by side

General Information

SpecInternational Harvester 666International Harvester 686Difference
ManufacturerInternational HarvesterInternational HarvesterSame
Model666686—
CategoryUtilityUtilitySame

Engine

SpecInternational Harvester 666International Harvester 686Difference
ManufacturerInternational HarvesterInternational HarvesterSame
ModelD312D310—
Rated RPM2,000RPM2,000RPMSame
Cylinders66Same
Displacement312ci310ci▲ 666+2 ci · <1%
Bore3.9in3.9inSame
Stroke4.4in4.4inSame

Transmission

SpecInternational Harvester 666International Harvester 686Difference
TypeSliding gearTwo-speed power shift—

Dimensions & Weight

SpecInternational Harvester 666International Harvester 686Difference
LengthNot recorded162in—
WidthNot recorded89.4in—
HeightNot recorded105in—
Operating Weight7,053lb7,770lb▲ 686+717 lb · +10%

Hydraulics

SpecInternational Harvester 666International Harvester 686Difference
System TypeNot recordedOpen center—
Steering TypeHydrostatic powerPower—

Power Take-off (PTO)

SpecInternational Harvester 666International Harvester 686Difference
TypeIndependent Rear PTOIndependent—
Speed 1540rpm540rpmSame

Hitch & Towing

SpecInternational Harvester 666International Harvester 686Difference
Hitch TypeIH Fast HitchThree-Point Hitch—
Hitch CategoryIIIISame
Hitch PositionRearRearSame

Chassis & Drive

SpecInternational Harvester 666International Harvester 686Difference
Chassis Type4x2 2WD4x2 2WDSame
Drive Type2WD2WDSame
Steering TypeHydrostatic powerPower—
Brake TypeDry discDisc—

Electrical

SpecInternational Harvester 666International Harvester 686Difference
Starter TypeElectricElectricSame

Capacities

SpecInternational Harvester 666International Harvester 686Difference
CoolantNot recorded5.3gal—

Operator Station

SpecInternational Harvester 666International Harvester 686Difference
TypeOpen or Two-post ROPS (optional)Two-post fixed ROPS—

Category context

Both models against the field

Engine Displacement

median 183 ci
A · 85th percentile (312 ci)B · 85th percentile (310 ci)

Cylinders

median 4
A · 93rd percentile (6)B · 93rd percentile (6)

Forward Gears

median 12
A · 6th percentile (5)B · 39th percentile (10)

Operating Weight

median 5,303 lb
A · 67th percentile (7,053 lb)B · 74th percentile (7,770 lb)
A · 666B · 686Median Utility Tractor
Full spec pageInternational Harvester 666Full spec pageInternational Harvester 686