• Vehicle type: unspecified
  • Rigid chassis
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1929–1952
  • 20,400 built

It was ranked on an engine power figure whose source does not say gross or net. 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

ALLIS-CHALMERS Modell-U specs: hp, weight, years

CONTINENTAL S-10 four-cylinder. The manufacturer claimed 25.6 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

25.6 hp

19.1 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “Allis-Chalmers Modell U”, 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
4,822–5,031 lb
Top speed
5.0–10.7 mph

ALLIS-CHALMERS Modell-U specs: key facts

  • The ALLIS-CHALMERS Modell-U was built from 1929 to 1952.

  • The ALLIS-CHALMERS Modell-U has a claimed engine power (gross or net not stated) of 19.1 kW (25.6 hp); it has no measured PTO figure.

  • The ALLIS-CHALMERS Modell-U is two-wheel drive (2WD).

  • The ALLIS-CHALMERS Modell-U has a CONTINENTAL S-10 engine, a 4-cylinder unit.

  • The ALLIS-CHALMERS Modell-U weighs 2,187–2,282 kg (4,822–5,031 lb) unladen.

  • The ALLIS-CHALMERS Modell-U has a rear PTO running at 530 rpm.

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

How does the Modell-U compare with its class?

  • Limitation:

    Three forward gears is low for its class — 50% below the median of 6 across the 124 machines within 10% of its power that hold this figure.

  • Strength:

    A 105 L fuel tank is high for its class — 183% above the median of 37 L across the 100 machines within 10% of its power that hold this figure.

Derived by WhichTractor from 126 comparable records. How we work this out

Illustration of the 1929–1952 ALLIS-CHALMERS Modell-U, a 26 hp farm tractor, cab was optional — shown without it, a drawing generated from its specification record
Illustration — not a photograph · cab was optional — shown without it

How much horsepower does a Modell-U have?

The only figure for the Modell-U is 25.6 hp (19.1 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)
25.6 hp

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

What engine is in a Modell-U?

A Modell-U has a CONTINENTAL S-10, a 4-cylinder engine.

Engine — Modell-U engine specifications
Make & modelCONTINENTAL S-10
Cylinders4, liquid-cooled

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

How much will a Modell-U lift?

Hydraulic and PTO specifications for the Modell-U are below.

Hydraulics & PTO — Modell-U hydraulics and PTO specifications
Rear PTO530 rpm

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

What transmission does a Modell-U have?

Transmission specifications for the Modell-U are below.

Transmission — Modell-U transmission specifications
SteeringMechanical worm steering
Top speed5.0–10.7 mph · 8.0–17.3 km/hthe article lists alternatives

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

How much does a Modell-U weigh?

A Modell-U weighs 4,822–5,031 lb (2,187–2,282 kg) unladen.

Weights & dimensions — Modell-U weights and dimensions
Unladen weight4,822–5,031 lb · 2,187–2,282 kgthe article lists alternatives
Length118.5–118.9 in · 3,010–3,019 mmthe article lists alternatives
Width52.0–65.0 in · 1,321–1,651 mmthe article lists alternatives
Height53.5–53.7 in · 1,359–1,365 mmthe article lists alternatives

Source · Traktorenlexikon, “Allis-Chalmers Modell U”

What oil does a Modell-U take, and how much?

A Modell-U engine takes 12.0 qt (11.4 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.

Modell-U fluid capacities, grades and service intervals
SystemCapacity
Engine oil12.0 qt · 11.4 LSource: Traktorenlexikon, “Allis-Chalmers Modell U” · single source, not independently verified
Transmission57.7 qt · 54.6 LSource: Traktorenlexikon, “Allis-Chalmers Modell U” · single source, not independently verified
Cooling system24.0 qt · 22.7 LSource: Traktorenlexikon, “Allis-Chalmers Modell U” · single source, not independently verified

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

Which tractors compare with a Modell-U?

Within 10% of its 25.6 hp of claimed engine power, the same type, and first built within 15 years of it.

Common questions about the ALLIS-CHALMERS Modell-U

Is a Modell-U two-wheel drive or four-wheel drive?

The ALLIS-CHALMERS Modell-U is two-wheel drive (2WD).

What PTO does a Modell-U have?

A Modell-U has a 530 rpm rear PTO.

What serial numbers does a Modell-U carry?

The source records 1 change by serial number, so some parts depend on which serial a Modell-U carries. It does not say whether that is the tractor’s or the engine’s number, and we never work out a year from a serial number.

Sources and how this page was built

Compiled from Traktorenlexikon, “Allis-Chalmers Modell U”.

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: Allis-Chalmers Modell U — CC BY-SA 4.0, WIKIBOOKS-TL-116537 · revision 1001551. Wikibooks contributors (Traktorenlexikon). Original document