Onan Generator shutting down

[rrmccorm]

Hi. Have a 4.0 onan generator that occasionally just shuts down while a/c is running. It will start back up in a couple of minutes or so and you never know when it will do it again. Driving me crazier. Anybody know what to do?
Thanks
Ronnie

[gmacklem]

My brother just had his genny tuned up because it would shut off on him. One of the things they mechanic did was adjust the governor. Apparently it regulates the engine speed when it is put under load.

[TimNJTA]

Possible faulty (or possibly working) low oil shutoff switch?

[CHICKDOE]

does the onan 4.0 have flashijng error codes when it shuts down? i know my onan 550 does. what are the error codes flashing?

[mzodarg]

When I purchased my 5er, it came with a 5.5 Onan. During the walkthrough they had a portable generator hooked up it raised a red flag. Anyway I told them I wanted the generator I'm paying for running. It kept dying and would flash 3x Believe it was service Generator code. It wouldn't restart until it was cooled down. Ended up being an engine oil leak, they had to swap generator with one from another 5er.

[AquaMan]

What is the ambient temperature while running? Could be vapor locking. This has been an issue on different models. Some have had vents put in their bay doors.