Boyler,
Rather than trade, purchase the third valve for the hydro, pull the hudros and install the third valve in each hydro and wala! You now have a 3100 rather than a 2800 and you are a Fastrak speedster.
I'm going to have to look very hard now to find you the hydro repair videos that shows the difference between a 2800 and 3100. There are three valves in the 3100, if you leave out one of the three, it is then a 2800. I ran across that early last year and my intentions are to do the upgrade come winter. There are three Fastraks on my block. One Super Z, One X-One and my Raptor SD. Yes sir, I'm the slum of the neighborhood. However, I have the largest yard with the stupid property lines and as have stated before. I get my yard done in less time than the other fellas simply due to the deck width and I'm not afraid of a bit of forward stick.
By the way, none of these folks mow professionally or for other folks. The dealer just talked them into the higher money. One of the fella's mower didn't come with the suspension seat. I questioned it and it turns out the mower had 71 hours on it. It was the demo and they sold the suspension seat off it. lol. Now that mine has the flex forks and suspension seat. The fella wants to trade. lol. He didn't notice I'd painted and installed the flex forks. I just offered to let him try my suspension seat. Only thing I said to him was, see if you can make it go any faster? lol
Now, three valves may cost you 40 bucks or less. I wouldn't be at all surprised if Bert could give us an estimate of the valves in the 2800 and 3100 hyrdos. Bert?
Max