So many questions. Unfortunately our M109 is tarped right now, but I can foresee having to un-tarp it and opening up the front covers. We also have a spare pack (takeout from a monument) that will answer the questions about the flanges, but it is out back and wrapped up tighter than a drum.
We have more than a regiments worth of manuals here on the M109 and the ARV. Unfortunately, most of the pictures are line drawings. One manual that is sitting before me now, TM 9-2350-311-20-1 has some good line drawings of the various systems. The manual is online if you google that TM number. Here is a photo of the complete steering for instance from page 9-17.
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