WhichTractor
  • Vehicle type: unspecified
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1921–1929
  • 128,125 built

WhichTractor size, not the maker’s category

We looked and the record does not say what this machine is. How we decide what a machine is

International Harvester 15-30 specs: hp, weight, years

INTERNATIONAL HARVESTER 381 four-cylinder petrol. The manufacturer claimed 29.6 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

29.6 hp

22.1 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “McCormick 15-30”, 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
5,800 lb
Top speed
4.3 mph

International Harvester 15-30 specs: key facts

  • The International Harvester 15-30 was built from 1921 to 1929.Source 1

  • The International Harvester 15-30 has a claimed engine power (gross or net not stated) of 22.1 kW (29.6 hp); it has no measured PTO figure.

  • The International Harvester 15-30 is two-wheel drive (2WD).Source 1

  • The International Harvester 15-30 has a INTERNATIONAL HARVESTER 381 engine, a 4-cylinder 6.26 L petrol unit.

  • The International Harvester 15-30 weighs 2,631 kg (5,800 lb) unladen.

  • The International Harvester 15-30 has a rear PTO running at 661 rpm.Source 1

Source · Traktorenlexikon, “McCormick 15-30”

How does the 15-30 compare with its class?

  • Limitation:

    Three forward gears is low for its class — 50% below the median of 6 across the 138 machines within 10% of its power that hold this figure.

  • Worth knowing:

    An unladen mass of 2,631 kg is high for its class — 59% above the median of 1,655 kg across the 139 machines within 10% of its power that hold this figure.

Derived by WhichTractor from 139 comparable records. How we work this out

Illustration of the 1921–1929 International Harvester 15-30, a 30 hp farm tractor, operator station not recorded — shown as an open platform, a drawing generated from its specification record
Illustration — not a photograph · operator station not recorded — shown as an open platform

How much horsepower does a 15-30 have?

The only figure for the 15-30 is 29.6 hp (22.1 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)
29.6 hp

Source · Traktorenlexikon, “McCormick 15-30”

What engine is in a 15-30?

A 15-30 has an INTERNATIONAL HARVESTER 381, a 4-cylinder 6.26 L petrol engine.

Engine — 15-30 engine specifications
Make & modelINTERNATIONAL HARVESTER 381
Cylinders4, liquid-cooledSource 1
Displacement381.7 ci · 6.26 L

Source · Traktorenlexikon, “McCormick 15-30”

How much will a 15-30 lift?

Hydraulic and PTO specifications for the 15-30 are below.

Hydraulics & PTO — 15-30 hydraulics and PTO specifications
Rear PTO661 rpm

Source · Traktorenlexikon, “IHC 15-30”

What transmission does a 15-30 have?

Transmission specifications for the 15-30 are below.

Transmission — 15-30 transmission specifications
ClutchPedal operated multi-disc clutchSources disagreePedal-operated multi-plate clutch (Traktorenlexikon, “IHC 15-30”)
BrakesHand lever operated transmission brakeSources disagreeHand lever-operated transmission brake (Traktorenlexikon, “IHC 15-30”)
Top speed4.3 mph · 7.0 km/hSource 1

Source · Traktorenlexikon, “McCormick 15-30”

How much does a 15-30 weigh?

A 15-30 weighs 5,800 lb (2,631 kg) unladen.

Weights & dimensions — 15-30 weights and dimensions
Unladen weight5,800 lb · 2,631 kgSource 2
Wheelbase85.0 in · 2,159 mm
Length137.0 in · 3,480 mm
Width65.0 in · 1,651 mm
Height70.0 in · 1,778 mm
Front track52.0 in · 1,321 mmSource 2
Rear track53.0 in · 1,346 mm
Turning radius, braked8.2 ft · 2.51 m

Source · Traktorenlexikon, “IHC 15-30”

What oil does a 15-30 take, and how much?

Fluid capacities for the 15-30 are below.

15-30 fluid capacities, grades and service intervals
SystemCapacity
Cooling system56.0 qt · 53.0 LSource: Traktorenlexikon, “McCormick 15-30” · single source, not independently verified

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

Which tractors compare with a 15-30?

Within 10% of its 30.0 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 15-30

Is a 15-30 two-wheel drive or four-wheel drive?

The International Harvester 15-30 is two-wheel drive (2WD).

What PTO does a 15-30 have?

A 15-30 has a 661 rpm rear PTO.

Sources and how this page was built

Compiled from Traktorenlexikon, “McCormick 15-30”; and Traktorenlexikon, “IHC 15-30”.

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 15-30 — CC BY-SA 4.0, WIKIBOOKS-TL-118689 · revision 1031887. Wikibooks contributors (Traktorenlexikon). Original document
  2. Traktorenlexikon: McCormick 15-30 — CC BY-SA 4.0, WIKIBOOKS-TL-117715 · revision 1059870. Wikibooks contributors (Traktorenlexikon). Original document