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Allis Chalmers D21 Tractors, Parts, Manuals, Information, & Serial Numbers
Allis Chalmers D21

Allis Chalmers released its first D21 tractor in 1963, and it sold for about $12,300. For the first two years, a regular, six cylinder diesel engine ran this machine. This model was referred to as the Series I. Starting in 1965, a six-cylinder turbo-charged diesel engine was used, and it was called the Series II. A major difference in the two engines was the horsepower output. In 1963, the Series I D21 had a max PTO power measure of 103.1 horsepower, and a max drawbar power of 93.1 hp. Once the turbo-charger was installed, the PTO horsepower jumped up to 127.8 hp, and the drawbar power topped out at 116.4.

The transmission used on the D21 was an eight-geared sliding gear tranny. It had eight forward speeds and two in reverse. It was controlled by a range control knob and gear shift lever. The range control knob was near the steering wheel, allowing the farmer to have the tractor in either high or low range. The gear shifter then was used to select the desired gear. All of this had to be done while the tractor was stopped. With 18.4×34 rear tires, the D21 could move anywhere from 1.6mph to 16.2mph.

Serial numbers can be found on the torque housing of the D21. The production year for certain serial numbers are as follows:

1963: 1-100 | 1964: 101-1417 | 1965: 1418-2079 | 1966: 2080-2408 | 1967: 2409-2863 | 1968: 2864-3777 | 1969: 3778-4498

The D21 Series II began with serial number 2201 in 1965.

Antique Allis Chalmers D21 Tractors And Parts

Comments On The Allis Chalmers D21

  1. teddy brown on 01.30.2011

    The tractor that turned the prairie into a corn field, the monster D21 ALLIS!

  2. miguel on 01.26.2013

    Hola tengo un tractor allis chalmers D21 me encuentro en mexico y solo quería saber el precio del kid de reparación general del motor. y si me pudieran ayudar en ese aspecto gracias . esperare su respuesta

    Hi I have a D21 Allis Chalmers tractor am in Mexico and I just wanted to know the price of kid of engine overhaul. and if I could help in this regard thanks. Waiting for your response

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