You need to go to your nearest New Holland dealer and buy a Baler Knotter Service Manual.
I suggest this because it sounds to me that you have absolutely no clue what you are talking about, just by the way you've presented your question.
Additionally, there are lots of help forums on here - Google the words "how to time new holland baler" - and you will find a plethroa of generic information for different NH balers on timing procedures.
HOWEVER... If you are not familiar with this kind of service work... Please... go buy yourself a MANUAL! They are NOT that expensive, and they are worth their weight (and then some) in gold!
You can also buy manuals on-line. I bought mine from a seller on eBay.
Here's a link to a current auction, good for the next 29 days or so: http://www.heavyequipmentshop.info/view.php?item=NewHollandKnotterServiceTipsBalerManualLot&num=370404567925
You can purchase the pair of manuals for like $32.00 US dollars, including the shipping!
Don't get screwed by being a cheap skate! Hay is extremely weather dependent, and there's no time for down time!
Good luck & god bless...