I put the search term "dry pto" as a general internet search term in my internet browser and got:
Defines pto as power take-off in a PTO 101 article. Though where it was located on the internet was a bit strange.
"This information was collected from numerous posts on the Country Coach Yahoo Group site. Many list members contributed, espe- cially George Harper, Bob Handren and Roger Uhlich, who all provided photographs. PTO 101 was edited by Lee Zaborowski."
Note: general internet searches are great because they search the various rv forums as well, yet, I still use the search feature in this forum at times.