Terry,
I believe Roger drew a blank on the lockout valve. It is almost necessary to lockout the deck cylinder to operate the angle of the blade quickly.
Does your 445 have the quick couplers installed on the selective control valve, under the left foot well? Are the colored dust plugs present on the quick couplers? If so, is the hydraulic port identification sticker present on the front left lip of the foot well? If the sticker is present and the 54" blade has the proper colored caps installed, the hook-up is a lot easier.
I just checked my tractor and quick hitch. The connections are made as follows:
The top left port(when looking at the front of the selective control valve),labeled "1" and colored yellow, is connected to the rear of the angle cylinder.
The top right port, labeled "2" and colored silver, is connected to the front of the angle cylinder.
The bottom left port, labeled "3" and colored black, is connected to the top of the lift cylinder.
The bottom right port, labeled "4" and colored green, is connected to the bottom of the lift cylinder.
The top lever will control the angle. The bottom lever will control the up/down motion. The bottom lever also has a float detent, when pushed fully forward.
EDIT: I posted this after your reply to Roger. The 425 did not come standard with the hydraulic couplers. Also, my 2000 455 did not have the couplers when I purchased it from the original owner. He said the dealer told him it would be an extra, IDK.
I hope this helps.
Bill