Hey Lexus 114,
When you hear someone tell you that the Toro personal pace transmissions are maintenance free, don't believe them. On the landscaper forums, I have read about what happens when those guys "cheap out" and try to use Toro personal pace 21" mowers (with Honda or Kawasaki engines) instead of the standard Toro commercial duty 21" mowers with 3 speed transmissions and the same engines. Long story short - they don't make it past their 2nd year under commercial conditions. I heard one guy was quoted $200 + labor for his shot transmission.
It is my understanding that the toro manual calls for #2 white lithium grease in that transmission gear box. (I am too lazy to check it out, but I am sure someone else will). Anyway, the pan is removable.
As for me, I have a 2 stroke, 6 1/2 HP Lawn Boy with an Easy Stride transmission (which is a clone of the Personal Pace). I tend to go overkill on maintenance, and used that Amsoil Series 2000 Synthetic Racing Grease, instead of the lithium grease. (Also because I didn't know what else to do with that spare tube of grease). I'm going into my 2nd year using that Racing grease, and so far, no ill effects or grinding noises.