BX2380 mower deck won’t lock out on “top”

[Bruh44]

I watched a YouTube video on this. I found the adjustment in the back next to the rear left tire. I bottomed it out. It still won’t lock in the top position. It will adjust 1-4 with no issues.
I’m not real sure where to go with it from here. I took the deck off so I was able to scrape my road with a box blade. I won’t lock in top with the mower deck off either.
Any ideas where the issue is?

 

[skeets]

You have to run the deck all the way up till the pump starts to bypass and then turn the knob,, some times it can be a PIA so run it all the way up turn it off and get under and look at the piece, you can push up on the deck as you turn the knob,, If its is really new they seem to put a lot of paint on things and it wont let it lock in place. I am sure there is a deck adjustment for it but I dont know what it might be