New Holland 688 Baler

I have a new-to-me 2002 NH 688 baler and I am having trouble getting the pickup head down. It has a hydraulic head on it, and a hand crank but I cannot get the head down using either.  I cannot get the crank to turn and the hydraulics don’t lower it either.  Is there some sort of lock on the header that I am missing?  

 

I am also wondering how to thread Pritchett net wrap.  There are diagrams for white net wrap and black net wrap but I do not know which one is more like the Pritchett wrap.

 

Thanks for any help anyone can give me.

New Holland 688 Baler