1936,
The model A, introduced in 1933, was the first Deere to use a flange mounted magneto (previous models used a base mount). Deere chose the new Fairbanks Morse magneto RV series, and FM specialized it to Deere's specs and labeled it the RV2A. It is the magneto with the wires coming out the top, and was used from 410000 - 424024. When the B was introduced Deere chose to use the FM series on it, but there was a clearance problem with the fuel tank if the wires came out the top. So, FM provided the DRV2B series, with a normal vertical flange but the magneto body was rotated 90 deg to the front so the wires came out the side towards the front of the tractor (called the "horizontal" DRV2B). The idea was to use the same magneto on both the A and B, but problems arose and the B used a unique version of the DRV2B from B1000-B14037. At that time, following a flywheel change in the model B which involved different locations of the flywheel markings, both the A and B used the DRV2B series into the 1938 model year, when the A changed to the Edison Splitdorf CD at 462101 (with one alternation back to the FM). The B continued with the DRV2B until 24049, when it began alternating with the new Wico 477B.There is some interesting history involved with this subject - Deere became unhappy with FM servicing of their magnetos, and that finally resulted in the switch to Edison Splitdorf and Wico brands. If anyone is interested in this topic, I'm giving a talk on magnetos at the next Gathering of the Green winter convention in March 2008, and will cover these changes in detail, and the history of the magnetos, as well as service info on the various magnetos used by Deere. Info at www.gatheringofthegreen.com.
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