I found a serial # on the back of the tranny while pulling the right side rear tire off the 109 today (2050 0440 437733) Is that the transmission serial number?
Jeremiah: (do you mind if I call you Jeremiah?)
Long story short-er, I got time to look at the 109 today while in the trade-in lot, and, in answer to your questions from last night:
1. It has external brakes.
2. It does not have lights.
3. It has a deck, but, like I said, I can't run it at the moment.
4. The belts are in fair shape, & would probably get me through a year or two if I needed.
5. By button, I'm thinking you mean the little one that sticks up through the top of the PTO engagement lever? It (appears) fine.
6 & 7. I took a closer look and still haven't noticed any leaks.
8. No way of knowing at the moment.
9. Didn't check.
Charlie: Thanks for posting the filter cross-references.
Charlie, I am running 50" decks on a 129 and 149. They have 2 different sized speed up pulleys. I will try to get the numbers off of them as soon as I can. I know the smaller one of the 2 I had to find a belt to fit and finally used a 1/2" belt from the green side that would work.