transfer in Beijing Capital Airport - T1 to T3

I land at 8am in PEK from MNL with china eastern airlines T1 and need to transfer to T3 United Airlines to Chicago at 3:20pm ( 5 hrs layover ) do I have enough time? Is there a United transfer desk in T1 to print boarding pass and leave luggage? I’m able to transit PEK without transit visa for 24 hours with proof of onward ticket. Is this possible with bag checked?