First, the Model Number for your mower is A16314E, and the specific identification if it has 32" cut with side discharge, is CS4L16B32. If it has 38" cut with side discharge, it is a CS4L16B38. As far as I can tell, Outdoorking does not have any information on either of them. It is possible that Bruce has some and can upload it. However you can download the owner manual and Illustrated Parts List here:
http://www.coxmowers.com.au/wp-content/uploads/2012/08/A16314E-Stockman-4000-Live-Axle.pdf

That seems to answer a number of your questions. Note also there
is some general information on Cox maintenance here:
http://www.coxmowers.com.au/?page_id=1308

According to the Cox site, your mower has the standard Cox conical variable ratio drive. You can get some information on its care and feedling from this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=58315#Post58315