Just got a new x394 & have one thing that I'm not sure about. With the engine running, parking brake off & no pedals depressed, if on an incline is it normal to have the machine start rolling? Forward or backward makes no difference.
I first ran into this in getting the unit off the trailer. The grade made it a bit nose down & when I took my foot off the brake after disengaging the parking brake control it immediately started rolling. Kinda caught me by surprise because of how far you have to move your foot from brake to HST pedal. Checked it again on grades while doing some test mowing & if you aren't on the brake or the appropriate pedal, it will roll down grade.
I don't remember having this happen with the SST18. If you didn't pull the release at the back, you could not get it to move much at all without engaging a pedal.