Hi Grumpy,
I take it from what you are saying that there is meant to be an adjustment for the chain that is inside the rear left wheel but all there is is a large cog the chain is going around and a little one on top which turns with the clutch and that's it.

Also the chain has some loose slack in it as you can see to the right part of the pic below. You will also notice to the left of the chain (toward the front of the mower) there are some holes in the frame where it seems maybe this chain tightening adjustment may go.

Do I get the feeling we are onto something or am I getting excited for nothing?


[Linked Image]