ZTR's and Commercial Turf Equipment
Got the classic issue with a weak left side (DUP-10A[S?]). I reached out to Tuff-Torq and they advised that the DUP-10E was an upgraded part (no cooling fan as it is not needed) and should work on my 757. The DUP-10E new is around $500.
There is nearly no information about these pumps online...