I have a honda harmony. Got it with my house. Been working perfectly. Automatic transmission it seems. Won't move today. Checked the little plastic oil reservoir by the right rear wheel. It's dry. Do you use transmission fluid or something else. Don't want to screw it up.

Hi,
It calls for the Honda brand. You did not say a model and all are Harmonys. See an example manual at:
http://www.hondapowerequipment.com/pdf/manuals/31763800.pdf
Peace,
Clarke