Photos would be great to confirm my thinking!I've a similar model.
It runs off two phases I 'think' as there's only one transformer winding.
I can get some photos of how my very similar one is wired tomorrow. (Today).
They are great bits of kit. Not very portable, mind you.
haha. Portability - it took hoists and two people at each end to get it in the discovery and the suspension sank somewhat once in!!