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Tractor · 1976Unverified

International Harvester 686

Name: International Harvester 686
Brand: International Harvester

International Harvester 686 · 66 hp. Reference specifications; pending source verification.

The International Harvester 686 is a tractor model with a rated output of 66 hp, positioning it in the middle of its class in terms of power. Manufactured from 1976 to 1980, this model features a 6-cylinder diesel liquid-cooled engine, paired with a powershift transmission and two-wheel drive system. The listed weight of the International Harvester 686 is 3524 kg, and it is designed for tasks spanning up to 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

66 hp

Max power

43.3 kW

Weight

3524 kg

Catalogue coverage

Variants represented

Richest spec table

91 rows

Recorded power

66 hp

Recorded weight

3524 kg

Transmissions

10-speed two-speed power shift

Production years

1976-1980

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerInternational HarvesterReference

Total built6,000Reference

Original price was $14,700 in 1980Reference

The International Harvester 686 is nearly identical to the IH 666, it was simply renamed when the 86 series arrived in 1976. One major change did occur in 1979, when the 310 diesel replaced the 312.Reference

Two-wheel driveReference

Power steeringReference

Disc brakesReference

Two-post fixed ROPS.Reference

Engine

International Harvester 5.1L 6-cyl dieselReference

International Harvester 4.8L 6-cyl gasolineReference

Drawbar (tested)43.3 kWReference

International Harvester D310Reference

dieselReference

6-cylinderReference

liquid-cooledReference

German (Nuess) built diesel that replaced the 312 diesel in 1979.Reference

Displacement5.1 LReference

Bore/Stroke98 x 111 mmReference

Rated RPM2000Reference

Starter volts12Reference

International Harvester D-312Reference

Displacement5.1 LReference

Bore/Stroke98 x 112 mmReference

Air cleanerdryReference

Idle RPM900-2000Reference

Oil capacity11.4 LReference

Coolant capacity19.9 LReference

International Harvester C291Reference

gasolineReference

Displacement4.8 LReference

Bore/Stroke95 x 112 mmReference

Power at rated engine speed49.4 kWReference

Max power43.3 kWReference

Power at rated engine speed49.4 kWReference

Max power42.7 kWReference

Power at rated engine speed49.5 kWReference

Max power43.0 kWReference

Transmission

10-speed two-speed power shiftReference

TransmissionTorque AmplifierReference

Typetwo-speed power shiftReference

Gears10 forward and 2 reverseReference

Oil capacity60.6 LReference

PTO & Hydraulics

PTO (tested)49.5 kWReference

Hydraulic system60.6 LReference

Typeopen centerReference

Capacity60.6 LReference

Total flow45.4 lpmReference

Rear TypeIIReference

Rear PTOindependentReference

Rear PTO Type540 (1.375)Reference

Capacities

Fuel117.3 LReference

Dimensions

Wheelbase261 cmReference

Weight3524 kgReference

Front tire7.50-16Reference

Rear tire15.5-38Reference

Ag front7.50-16Reference

Ag rear15.5-38Reference

Length411 cmReference

Width227 cmReference

Height (exhaust)266 cmReference

Diesel Shipping weight3524 kgReference

Ballasted weight4690 kgReference

Front tread147 to 208 cmReference

Rear tread142 to 243 cmReference

686 Serial Numbers

Location:Clutch housing on right side.Reference

19767500Reference

19777729Reference

19789899Reference

197911417Reference

198012923Reference

FAQ: How to read a serial number table.Reference

Test results

NTTL 1151: 312 diesel Torque Amplifier 2WDReference

NTTL 1152: gasoline Torque Amplifier 2WDReference

NTTL 1336: 310 diesel Torque Amplifier 2WDReference

312 diesel Torque Amplifier 2WDNovember 3 - 14, 1973Link: Nebraska Tractor Test 1151 fileReference

PTO performanceReference

Fuel use17.8 l/hourReference

Drawbar performanceReference

Fuel use17.4 l/hourReference

Gear 3-Direct used for power test.Reference

Max pull3634 kgReference

Gear 2-TA used for pull test.Reference

Gasoline Torque Amplifier 2WDNovember 5 - December 3, 1973Link: Nebraska Tractor Test 1152 fileReference

Fuel use45.4 l/hourReference

Fuel use21.6 l/hourReference

Max pull3620 kgReference

310 diesel Torque Amplifier 2WDMarch 26 - April 16, 1980Link: Nebraska Tractor Test 1336 fileReference

Fuel use15.5 l/hourReference

Max pull3634 kgReference

Gear 1-Direct used for pull test.Reference

Speeds

With 15.5-38 rear tires.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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