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Tractor · 1981Unverified

International Harvester 6788

Name: International Harvester 6788
Brand: International Harvester

International Harvester 6788 — 60 2+2 Series · 171 hp. Reference specifications; pending source verification.

The International Harvester 6788 is a high-powered tractor with a rated output of 171 hp, positioning it within the more powerful machines in its class. It was manufactured from 1981 to 1984. The tractor features a 6-cylinder turbocharged diesel liquid-cooled engine, transmitting power through a four-wheel drive system with a powershift transmission. Its listed weight is 7674 kg, with a capacity for tasks spanning approximately 600–1,500 acres.

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

Rated power

171 hp

Max power

105.9 kW

Weight

7674 kg

Catalogue coverage

Variants represented

Richest spec table

73 rows

Recorded power

171 hp

Recorded weight

7674 kg

Transmissions

12-speed two-range power shift

Production years

1981-1984

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

Built in Rock Island, Illinois, USAReference

Total built347Reference

Original price was $70,500 in 1984Reference

Four-wheel driveReference

Articulated power steeringReference

Cab standard with burgundy finish, heat, and air-conditioning. Optional western finish interior.Reference

Engine

International Harvester 7.6L 6-cyl dieselReference

Engine149.1 kWReference

Drawbar (claimed)105.9 kWReference

Drawbar (tested)105.9 kWReference

International Harvester DT 466BReference

turbocharged dieselReference

6-cylinderReference

liquid-cooledReference

Displacement7.6 LReference

Bore/Stroke109 x 136 mmReference

Power149.1 kWReference

Rated RPM2500Reference

Oil capacity18.9 LReference

Coolant capacity32.2 LReference

Power at rated engine speed127.2 kWReference

Max power105.9 kWReference

Transmission

12-speed two-range power shiftReference

Typetwo-range power shiftReference

Gears12 forward and 6 reverseReference

Oil capacity89.4 LReference

Left lever selects high, low, or reverse range. Right lever selects gear. On-the-move power shift without the clutch between gear pairs 1/2, 3/4, and 5/6. Synchronized shift (with the clutch) from 2-to-3 and 4-to-5.Reference

PTO & Hydraulics

PTO (claimed)126.8 kWReference

PTO (tested)127.2 kWReference

Hydraulic system89.3 LReference

Typeclosed centerReference

Capacity89.3 LReference

Valves2 to 4Reference

Pump flow68.1 lpmReference

Steering flow45.4 lpmReference

Rear TypeIII/IIReference

Rear PTOindependentReference

Rear PTO Type1000Reference

Power at rated PTO speed124.1 kWReference

Capacities

Fuel336.9 LReference

Fuel526.1 LReference

Dimensions

Wheelbase279 cmReference

Weight7674 kgReference

Front tire18.4-38Reference

Rear tire18.4-38Reference

Ag front18.4-38Reference

Ag rear18.4-38Reference

Length579 cmReference

Width284 cmReference

Shipping weight7674 kgReference

Ground clearance72 cmReference

Bar rear axle82 mmReference

6788 Serial Numbers

Location:transmission housing, right sideReference

19818801Reference

19828810Reference

19838840Reference

19848871Reference

19858946Reference

FAQ: How to read a serial number table.Reference

International Harvester 6788 Height

Hood202 cmReference

Cab289 cmReference

Exhaust318 cmReference

Test results

Diesel 12-speed 4WDNovember 5 - 17, 1980Link: Nebraska Tractor Test 1377 fileReference

PTO performanceReference

Fuel use41.3 l/hourReference

Fuel use36.7 l/hourReference

Drawbar performanceReference

Fuel use40.5 l/hourReference

Gear 3-Low-Direct used for power test.Reference

Max pull8649 kgReference

Gear 1-Low-Direct used for pull test.Reference

Speeds

With 18.4-38 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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