hard surface tool issue

Aloha. I have a turbo hybrid hard surface cleaner and the swivel stopped spinning mid way through a job. I ordered a replacement swivel part because when I took my old one off it seemed a bit stiff so I figured that was the problem. Well after spending $190 for the replacement swivel I turned...

This is the spinner I have… don’t know why it is so hard to push. Had it set on 800psi last time i used it. By the end of a job i am drenched in sweat and beat. Any suggestions??