The self propelled setup in the 10 year old "yard machine" push mower kicked the bucket. I couldn't see anything wrong externally so I took the "transmission's" gear box apart and found that the axle shaft plastic gear was completly chewed up. The goofy thing was that it had very little oil/ grease (whatever they used) with no signs of it leaking.
Thankfully I had a spare from a junked mower that the GF's BIL gave me, but it is sad to think it could have been useless if not for the spare. Stuff really is throw away these days.

Thankfully I had a spare from a junked mower that the GF's BIL gave me, but it is sad to think it could have been useless if not for the spare. Stuff really is throw away these days.