Before diving into the "how," it is important to understand the "why." Simply flipping the deck up on its side is often not enough for thorough maintenance on the F725.
Whether you need to sharpen the blades, replace the spindle bearings, clean caked-on grass, or perform belt replacement, removing the 60-inch or 54-inch deck is a necessary skill.
This is the most critical step. You must remove the drive belt that connects the engine PTO clutch to the deck.