Search/Tractor/International Harvester/3688

Embed

Paste on your site — shows live UK/US specs and links back here. Free to use.

<iframe src="https://farmfleetspecs.com/embed/international-harvester-3688" width="100%" height="430" loading="lazy" style="border:1px solid #e6e8e4;border-radius:14px;max-width:560px" title="International Harvester 3688 specs — FarmFleetSpecs"></iframe>

Tractor · 1981Unverified

International Harvester 3688

Name: International Harvester 3688
Brand: International Harvester

International Harvester 3688 — 30 Series · 114 hp. Reference specifications; pending source verification.

The International Harvester 3688 is a tractor model with a rated output of 114 hp, positioning it centrally within its class in terms of power. It was manufactured from 1981 to 1985. The 3688 features a 6-cylinder diesel liquid-cooled engine, coupled with a four-wheel drive powershift transmission. Its listed weight ranges from 11300 to 13200 pounds, and it is suitable for jobs covering approximately 200–800 acres.

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

Rated power

114 hp

Max power

74.0 kW

Weight

11300 to 13200 pounds

Catalogue coverage

Variants represented

Richest spec table

85 rows

Recorded power

114 hp

Recorded weight

5125 kg

Transmissions

16-speed partial power shift

Production years

1981-1985

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

Row-Crop tractorReference

Built in Rock Island, Illinois, USAReference

Total built2,572Reference

Original price was $45,000 in 1981Reference

Two- or four-wheel driveReference

Final drivesbull gearReference

Differential lockrearReference

Power steeringReference

Hydraulic wet disc brakesReference

Cab standard with heat and air-conditioning. Optional burgundy or western finish interiors.Reference

Variants

3688 Hi-Clearhigh-clearance modelReference

Engine

International Harvester 7.1L 6-cyl dieselReference

Drawbar (claimed)74.7 kWReference

Drawbar (tested)74.0 kWReference

International Harvester D436Reference

dieselReference

6-cylinderReference

liquid-cooledReference

Displacement7.1 LReference

Bore/Stroke109 x 127 mmReference

Air cleanerdual dry elmementReference

Compression16:1Reference

Rated RPM2400Reference

Idle RPM900-2400Reference

Starter volts12Reference

Coolant capacity24.6 LReference

Oil capacity13.2 LReference

Power at rated engine speed84.8 kWReference

Max power74.0 kWReference

Transmission

16-speed partial power shiftReference

Typepartial power shiftReference

Gears16 forward and 8 reverseReference

Clutch355.6mm cerametallic discReference

Oil capacity85.2 LReference

Left lever selects gear, right lever selects high, low, or reverse range. Tractor may be shifted on the move without the clutch between gear pairs (1-2, 3-4, etc). Synchronized shifting, using the clutch, between gear pairs (2 to 3, 4 to 5, etc). The transmission is four-gear with the powershift provided by an electric solenoid actuated Torque Amplifier.Reference

PTO & Hydraulics

PTO (claimed)84.3 kWReference

PTO (tested)84.8 kWReference

Hydraulic system85.2 LReference

Typeclosed centerReference

Capacity85.2 LReference

Valves2 to 4Reference

Pump flow68.1 lpmReference

Total flow102.2 lpmReference

Steering flow45.4 lpmReference

Rear TypeIIReference

Controldraft sensingReference

Rear PTOindependentReference

Rear PTO Type540/1000 (1.375)Reference

Engine RPM540@2100Reference

Engine RPM1000@2100Reference

Power at rated PTO speed83.9 kWReference

Capacities

Fuel189.2 LReference

Dimensions

Wheelbase266 cmReference

Weight11300 to 13200 poundsReference

Front tire11L-15Reference

Rear tire18.4-34Reference

Ag front11L-15Reference

Ag rear18.4-34Reference

Length467 cmReference

Width259 cmReference

Height (cab)284 cmReference

Shipping weight5125 kgReference

Operating weight5987 kgReference

Ground clearance33 cmReference

Rear axle82 by 2641 mmReference

Rear axle82 by 2997 mmReference

Front tread152 to 213 cmReference

Rear tread167 to 326 cmReference

3688 Serial Numbers

Location:Serial number plate on the right side of the tractor frame, ahead of the rear axle.Reference

1981501Reference

19821743Reference

19832482Reference

19842695Reference

19853068Reference

FAQ: How to read a serial number table.Reference

Electrical

GroundnegativeReference

Battery volts12Reference

Test results

Diesel 16-speed 2WDMay 26, 1982 - June 7, 1962Link: Nebraska Tractor Test 1440 fileReference

PTO performanceReference

Fuel use28.4 l/hourReference

Fuel use26.9 l/hourReference

Drawbar performanceReference

Max pull5556 kgReference

Speeds

With 18.4-34R1 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.

Partner tool · Free

Working out if you can afford this tractor?

YourIncomeCalculator.com — free, HMRC-aligned take-home pay, self-employment & VAT calculators. No sign-up.

Calculate your take-home pay

Recommended kit

Handy kit for owners

Popular tractor and farm accessories owners pick up for machines like this.

Disclosure: some links on this page are affiliate links. If you buy through them we may earn a small commission — at no extra cost to you. Learn more.