Thought I'd have a quick look at the Self Drive Mechanism as I've not seen one of these before.
Very basic!!
First I had to take off the blade plate, and of course the nut was rusted and seized - but I learned my lesson from you guys doing this same job with The Triplets - lots of Penetrating Oil - gave it an hour and out with the Rattle Gun - BANG - off it came

The off with the Belt Drive mechanism cover - damn - didn't take any photos off the bottom of the mower before taking this off.
And this is what was inside the Belt Drive Mechanism....lots of rubbish - but not too bad.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2017/05/full-7902-34615-dscn3191.jpg)
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2017/05/full-7902-34616-dscn3192.jpg)
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2017/05/full-7902-34617-dscn3193.jpg)
And inside the gear box that sits on top of the deck.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2017/05/full-7902-34619-dscn3190.jpg)
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2017/05/full-7902-34620-dscn3189.jpg)
Yuk - this has been full of water for quite some time - still - should be fixable - in fact it should come up well from what I can see so far.
Polybus