Your technical English is good. No problem here, understanding what
There is a repair manual in the Massey section on this site. Here is the link.
You can download from here, but there are restrictions as to how many per day, until
your post count reaches a certain level. I'm not sure of the specifics, but I'm sure
they are detailed here somewhere.
Do a search in the Massey section here. there was conversation not too long
ago about hubs that have play, and several good ideas on how to fix.
Looking forward to seeing the hitch operate.