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Thanks for the reply! Gemini Drives: Many 7 series models used these drives until about 2005. Models that used Gemini drives include the 718K, 720K, and some 721D and 725K models. Gemini drives combine the pump and drive motor in one unit on each side of the mower.

Purchased a used 721D that keeps ripping the flex disc- mostly on the gemini drive end, On closer observation I noticed the previous owner did not use matching motor mounts leading to a vertical issue, so I ordered 4 new motor mounts which by visual observation seems to have corrected the...