There are several versions of this unit. If you do not have the manual for this model, I recommend performing a search and downloading it. The manual is an assembly manual. It details the parts. It also has a section on getting the treadclimber ready for transport. Rather than trying to tear down the treadclimber and reducing it to its pre-assembly form, I suggest you examine the transport section.
http://download.nautilus.com/supportdocs/AM/Bowflex/BFX_TM3-5-7_AM_RevD_web.pdf