To manually lift a Grasshopper mower deck, follow these steps:
1. Locate the release lever on the mower deck.
2. Pull the lever to disengage the deck lift mechanism.
3. Lift the front of the deck using your hands or a lifting tool.
4. Secure the deck in the raised position by engaging the locking mechanism.
5. Lower the deck by releasing the locking mechanism and gently lowering it back into place.