I will look to see if I have any relevant manuals, but I don't think I do.
These may help:
http://middx.net/aec/board/viewtopic.php?f=1&t=436
http://www.greenmachinesurplus.com/aec-37-c.asp
There's always ebay, though they only seem to have the user manual for the recovery variant and a parts list for the tipper variant this morning.