Hello, this link is for the owner / operators manual.
http://www.coxmowers.com.au/wp-content/uploads/2012/08/20-4398H-11.5-13-Economy.pdf

To start with you need to know a few things:
There are two drive disks under your seat.
The LHS is the reverse disk and the RHS is the forward disk.

With out the engine running, push your pedal to go forward and at the same time, watch to see the drive cone swing across to touch the RHS disk.

Then push the pedal as if you want to reverse, does the drive cone swing across to touch the LHS disk.

The movement should be minimal as the set clearance from cone to plate should be 0.8 to 1mm each side of the cone. Doesn't really matter if it is the gap is a bit larger.
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I am not a Cox mechanic, but I have owned 2 x steel bonnet Cox's for years and I think they are mighty machines. Sorry to hear of your bad experience with yours.
I know there are Cox mechanic's on this forum.
See how you go.
Mark

Last edited by mark electric; 02/12/14 08:09 AM.
Happy is he who penetrates the mystery of things.