I also need some advice on what RPM's to be running at. The owner's manual doesn't specifically call out RPMs other than to not run full throttle for the first 50 hours. I kept moving the throttle around to not keeep it at a fixed RPM while under 50 hours.
The BX's are designed to run with the throttle wide open to give maximum flow and pressure to the hydraulics that run everything. But it doesn't really need "full throttle" for most work, and you eventually get a sense of how fast to run the engine. A few of the things I do, mostly based on "common sense":
1) Let the engine warm up at a moderate rpm... not idle and not wide open... for several minutes before getting to work.
2) Don't lug the engine at low rpm. Better to have it revved more than enough than too slow.
3) Use low range for any heavy work such as FEL digging, pulling that box blade, etc. Also for any steep hills.
4) Remember that the "go" pedal controls the HST and it does not operate like a gas pedal... when you need more pulling power and less speed, you
back off the pedal instead of stepping on it more. This is kind of hard for some folks to get used to.
5) As noted by others, take it easy for the break in period. Avoid running wide open and change the rpm's around some.
6) Change the fluids and filters per the specs. Diesels like clean fuel and air, and all those hydraulics will last longer if the hydro fluid is likewise clean.
Good luck. You have a great little tractor that can do amazing things.