WhichTractor
  • WhichTractor size: High-power
  • No lab test on file
  • 1981–1984
  • 347 built

It sits on the standard-size/high-power boundary, so either size is a fair description. WhichTractor size, not the maker’s category

Derived by WhichTractor from a sourced three-point linkage. How we decide what a machine is

International Harvester 6788 specs: hp, weight, years

INTERNATIONAL HARVESTER DT-466 B six-cylinder diesel. The manufacturer claimed 170.6 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

170.6 hp

127.2 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “IHC 6788”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

Weight
18,620 lb
3-point lift
8,598 lb
Hyd. flow
18.0 gpm
Top speed
18.6 mph

International Harvester 6788 specs: key facts

  • The International Harvester 6788 was built from 1981 to 1984.

  • The International Harvester 6788 has a claimed engine power (gross or net not stated) of 127.2 kW (170.6 hp); it has no measured PTO figure.

  • The International Harvester 6788 is four-wheel drive (4WD).

  • The International Harvester 6788 has a INTERNATIONAL HARVESTER DT-466 B engine, a 6-cylinder 7.64 L diesel unit.Source 1

  • The International Harvester 6788 weighs 8,446 kg (18,620 lb) unladen.

  • The International Harvester 6788 has a rear PTO running at 1000 rpm.

  • The three-point hitch of the International Harvester 6788 lifts 3,900 kg (8,598 lb) at the lower-link ends.

  • The hydraulic pump of the International Harvester 6788 delivers 68.1 L/min (18.0 gpm).

Source · Traktorenlexikon, “IHC 6788”

How does the 6788 compare with its class?

  • Limitation:

    Twelve forward gears is low for its class — 33% below the median of 18 across the 137 machines within 10% of its power that hold this figure.

  • Worth knowing:

    An unladen mass of 8,446 kg is high for its class — 24% above the median of 6,835 kg across the 149 machines within 10% of its power that hold this figure.

  • Limitation:

    The power figure is a manufacturer claim, not a measurement. No laboratory test report exists for this machine. Of the 149 tractors within 10% of its power, 10% carry one.

Derived by WhichTractor from 149 comparable records. How we work this out

Illustration of the 1981–1984 International Harvester 6788, a 171 hp farm tractor, a drawing generated from its specification record
Illustration — not a photograph

How much horsepower does a 6788 have?

The only figure for the 6788 is 170.6 hp (127.2 kW) of claimed engine power, gross or net not stated, no test standard stated — not power at the shaft.

Engine, claimed (gross/net not stated)
170.6 hp

Source · Traktorenlexikon, “IHC 6788”

What engine is in a 6788?

A 6788 has an INTERNATIONAL HARVESTER DT-466 B, a 6-cylinder 7.64 L diesel engine.

Engine — 6788 engine specifications
Make & modelINTERNATIONAL HARVESTER DT-466 B
Cylinders6, liquid-cooledSource 2
Displacement466.2 ci · 7.64 L
Electrical system12 VSource 2

Source · Traktorenlexikon, “IHC 3588”

How much will a 6788 lift, and what is its hydraulic flow?

A 6788 lifts 8,598 lb (3,900 kg) at the lower-link ends.

Hydraulics & PTO — 6788 hydraulics and PTO specifications
Pump flow18.0 gpm · 68.1 L/min
Lift at ends8,598 lb · 3,900 kg
Rear PTO1000 rpm
PTO shaft1 3/8"- 6 splines or 1 3/4"- 20 parts

Source · Traktorenlexikon, “IHC 6788”

What transmission does a 6788 have?

Transmission specifications for the 6788 are below.

Transmission — 6788 transmission specifications
ClutchPedal operated dry clutch
SteeringHydraulic steering and adjustable steering wheel
Top speed18.6 mph · 30 km/h

Source · Traktorenlexikon, “IHC 6788”

How much does a 6788 weigh?

A 6788 weighs 18,620 lb (8,446 kg) unladen.

Weights & dimensions — 6788 weights and dimensions
Unladen weight18,620 lb · 8,446 kg
Wheelbase110.0 in · 2,794 mm
Length228.3 in · 5,799 mm
Width112.0 in · 2,845 mm
Height115.8 in · 2,941 mm
Ground clearance28.4 in · 721 mm
Front track62.4–115.0 in · 1,585–2,921 mmWikibooks gives one track for both axles
Rear track62.4–115.0 in · 1,585–2,921 mmWikibooks gives one track for both axles

Source · Traktorenlexikon, “IHC 6788”

What oil does a 6788 take, and how much?

A 6788 engine takes 20.0 qt (18.9 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.

6788 fluid capacities, grades and service intervals
SystemCapacity
Engine oil20.0 qt · 18.9 LSource: Traktorenlexikon, “IHC 6788” · single source, not independently verified
Transmission & hydraulic94.5 qt · 89.4 LSource: Traktorenlexikon, “IHC 6788” · single source, not independently verified
Cooling system34.0 qt · 32.2 LSource: Traktorenlexikon, “IHC 6788” · single source, not independently verified

Always confirm against the operator’s manual for your machine before service.

Which tractors compare with a 6788?

Within 10% of its 166.4 hp at the PTO as the maker claimed it, with no laboratory test on file, the same type, and first built within 15 years of it.

Common questions about the International Harvester 6788

Is a 6788 two-wheel drive or four-wheel drive?

The International Harvester 6788 is four-wheel drive (4WD).

What PTO does a 6788 have?

A 6788 has a 1000 rpm rear PTO on a 1 3/8"- 6 splines or 1 3/4"- 20 parts shaft.

Sources and how this page was built

Compiled from Traktorenlexikon, “IHC 3588”; and Traktorenlexikon, “IHC 6788”.

Sources checked

14 SEP 2026

Spotted an error?

Sources

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

  1. Traktorenlexikon: IHC 3588 — CC BY-SA 4.0, WIKIBOOKS-TL-119176 · revision 1037669. Wikibooks contributors (Traktorenlexikon). Original document
  2. Traktorenlexikon: IHC 6788 — CC BY-SA 4.0, WIKIBOOKS-TL-119178 · revision 1037674. Wikibooks contributors (Traktorenlexikon). Original document