How to Legal Scan HP Officejet Pro 8600

Anyone have the answer to get my Officejet Pro 8600 to Scan Legal Size Documents - (8 ½" x 14") ?

Can not get it to work using the flatbed scanner or the ADF (Automatic Document Feed)

I believe I have all the current drivers installed

Prints Fine and Scans fine in Letter Size (8 ½ " x 11")

Running OS X Yosemite 10.10.4