Allis Chalmers D21 Specs & Review

Technical Specifications of Allis-Chalmers D21 Series I Tractor


  • Manufacturer: Allis Chalmers
  • Type: Row-Crop tractor
  • Built in: West Allis, Wisconsin, USA
  • Total built: 1,129
  • Original price: $5,700 in 1964


  • Type: Allis Chalmers 7.0L 6-cyl diesel
  • Fuel tank: 52 gal (196.8 L)


  • Type: 8-speed sliding gear


  • Engine: 119 hp (88.7 kW)
  • Drawbar (claimed): 93 hp (69.4 kW)
  • PTO (claimed): 103 hp (76.8 kW)
  • Plows: 7
  • Drawbar (tested): 93.09 hp (69.4 kW)
  • PTO (tested): 103.06 hp (76.9 kW)


  • Drive: Two-wheel drive
  • Steering: Power steering
  • Brakes: Band actuated disc brakes
  • Operator Station: Open

Tractor Hitch

  • Rear Type: III/II

Power Take-off (PTO)

  • Rear PTO: Independent
  • Rear RPM: 1000

Dimensions & Tires

  • Wheelbase: 96.1 inches (244 cm)
  • Weight: 9500 lbs (4309 kg)
  • Front tire: 7.50×20
  • Rear tire: 18.4×34


What is the engine power of the Allis-Chalmers D21 Series I?

The engine power is 119 hp (88.7 kW).

What type of transmission does it have?

The tractor has an 8-speed sliding gear transmission.

What is the fuel tank capacity?

The fuel tank capacity is 52 gallons (196.8 L).

What is the weight of the tractor?

The weight of the tractor is 9500 lbs (4309 kg).

What is the rear PTO RPM?

The rear PTO RPM is 1000.

Review of Allis-Chalmers D21 Series I Tractor

A Historic Milestone from Allis Chalmers

The Allis-Chalmers D21 Series I is a row-crop tractor that was built in West Allis, Wisconsin, USA. It was the first Allis Chalmers tractor to have over 100 horsepower and was priced at $5,700 in 1964.

Key Specifications

The tractor is equipped with a 119 hp engine and an 8-speed sliding gear transmission. It weighs 9500 lbs and has a fuel tank capacity of 52 gallons.


The D21 Series I offers solid performance with its 119 hp engine and 8-speed transmission. Its power steering and band-actuated disc brakes ensure smooth handling and effective braking.


The tractor comes with an open operator station, power steering, and band-actuated disc brakes. It also has a rear PTO that is independent and operates at 1000 RPM.


The tractor is known for its durability and was a significant milestone for Allis Chalmers, being their first tractor to exceed 100 horsepower. It has a robust build and is generally easy to maintain.

Value for Money

Given its historical significance and robust features, the D21 Series I offers good value for money, especially for collectors and those in need of a powerful row-crop tractor.

Pros and Cons

  • Pros: High horsepower, durable build, historic significance.
  • Cons: Open operator station may not be comfortable for all, older model may lack some modern features.

Best Suited For

The tractor is best suited for large-scale farming operations and is particularly good for row-crop farming. Its powerful engine and robust build make it ideal for heavy-duty tasks.

Final Verdict

The Allis-Chalmers D21 Series I is a historic and powerful tractor that offers a range of features designed for efficient and comfortable farming. Its significance as the first Allis Chalmers tractor to exceed 100 horsepower adds to its value, making it a worthwhile investment for both practical use and collection.