I am traveling Air China From the USA, arrive PEK T3, have a 7 hour layover at the airport.

Well, are the both flights Air China? If yes, it is an international to domestic transfer at T3. You need to check the luggage at PEK. The correct transfer procedures are the following:
Inspection & Quarantine, Exit and Entry Frontier Inspection - Baggage Claim - Customs Inspection - Going through Transfer Formalities - Security check - Waiting & Boarding.
In addition, you can make a reservation for the hourly lounge at T3. The hotline is 010-64558577 (T3C)，010-64532621 (T3E).