Actually, there were several versions, including Cat I & Cat II models, others specifically for high crop tractors and units built for the little D-10s and D-12s. The Buyer would purchase the one that best fit his needs. If the main use was for plowing, discing and other non-PTO jobs, he would probably buy the one with the top link down between the pull arms so as to allow full use of the Allis "Traction Booster" feature. On the other hand, if the buyer needed to use it for PTO equipment, he would opt for the unit with top-link bracket on the rocker shaft. The D-14, D-15 and D-17 tractors used a bolt on top link bracket in place of the clamp-on style. The parts are interchangable, so a farmer could have one 3-PH with the correct pieces to use it in either configuration. The "Beaming Tube" is simply Allis' name for the top-link and had nothing to do with reducing sway.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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