page_title: Allis-Chalmers D series
section_title: D12
hierarchical_section_title: Allis-Chalmers D series / D12
caption_attribution_description: English: 1966 Allis-Chalmers D 12 series II at a show in Carrollton, Ohio
context_page_description: The Allis-Chalmers D series is a line of tractors made by the Allis-Chalmers Manufacturing Company from 1957 to 1969. Most of the D-series tractors, except for the D21, had hand-operated, shift-on-the-go oil clutches, commonly referred to as a hand clutch. Allis-Chalmers marketed this arrangement as the "Power Director". This clutch was in low range when pulled back, neutral in the middle, and high range when pushed forward. It could also be ordered as a forward-reverser, called the "Shuttle Clutch". This hand clutch also exists on the D21, but it was not meant for shifting on the go.
context_section_description: The D12 replaced the Model CA in 1959. 4,070 D12's were made in their 10-year run from 1959 to 1968. The D12 had a 138.7-cubic-inch, four-cylinder, 31-horsepower gasoline engine that was tested in Nebraska at 29.43 drawbar horsepower.
caption: 1966 D 12 series II
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