I had a friend who made his living repairing generators mostly Onan. He said the 5500 Onan at about 1900 hours, or I think it was 1900 hours would break the belt that hooked the engine to the generator. They have a what he called a vertical lawn mower engine. I’m not sure whether it is an actual lawn mower engine or just a vertical engine. When the belt breaks it is a major repair. The belt is like a timing belt on a car and the generator must be dissembled to change it. So if at about 1900 hours it quits this could be the the belt.
Lynwood
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