Hello , i would like to know if i claim a cs go server the rank of server in gametracker will be reset or remain the present rank before claim ?
For example i want to claim a cs go server , the rank now is 120 and after i claim the rank remains 120 or will be reset ? I just want to be sure .

So according to your example, you want to claim a server that's already in the GameTracker list. If so yes, rank will remain the same. Still, ranks aren't consistent and will change according to the number of players your server getting compared to other servers.

Basically, it doesn't matter if you claimed it or not.

A server's rank is not nuked if / when the server has been claimed.

FAQ: How is server rank determined?

None of the information there has alluded or implied that claiming a server will nullify its current rank.