dawall
Hearing that the your BX has been out side for 1.5 years, I'm glad that you have decided to have a dealer go over it. They might find things that you wouldn't think to look for.
Get a manual if you can, if not buy the shop manual it helps a lot.
I did my own 50 hr service, my dealer provided great advice and I followed what they do at 50 hours.
Changed: air, oil, hydro, and both fuel filters, hydro fluid (super UDT), front axel fluid (super UDT), and engine oil (used mobil 1 5w40)
Greased: hydro pedal, back hoe, and FEL (done every 10 hours as per manual)
Cleaned: hydro screen, and radiator.
checked: wheel torque (this was third time), coolant level and concentration, tire pressure, all hydraulic lines, fuel lines, all fasteners on tractor, hydro fan, sprayed battery terminals.
I should have sprayed some superlube or triflow on the FEl linkage and will from now on.