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42" A-C #2025080. This Allis-Chalmers operating instruction is for a very common 42" mower deck that was used on most B-series and equivalent Simplicity tractors. (Other A-C models 2029933 and 2029958 share the same owners manual with this 202580, using the revised Form TM-7004A.) These are 6" deep, left-discharge decks, with 3 blades, with a "one-piece" deck skin.
The earliest type 42" decks (shown above) for Simplicity 700 and 725 tractors (MFR # 990190) or A-C B-1s (A-C MFR #2025009), were "3-piece" decks, where the 3 pieces of the deck shell bolted together. This was changed to a one-piece design around 1964.
Then, the next enhancement was a spring-loaded idler pulley that replaced the "slot and sliding shaft" belt tension adjustment (shown above). For example, Simplicity MFR #990285 and #990407 were such 42" decks with a sliding shaft adjustment. The deck described in these operating instructions has both those enhancements, and probably dates from about 1966 or 1967 (?).
300-400 Series Decks. This Allis-Chalmers operators manual is dated 1973 It covers the shallow 42" and 48" right-discharge mower decks used on many of the Lexington- manufactured tractors, including the A-C 300 and 400 series, and some Homelites. See the Homelite Section for more information about their similarities and differences.
Simplicity 885 & 886. This Owner's Manual covers two Simplicity decks (42" and 48") that are representative of the later decks used on Allis-Chalmers 700-series and Simplicity 7000-series. They are deep-style (6" above blades) left discharge decks, that evolved from the deep decks described above.
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