My Onan 7000(NHM spec-F)seems to be failing under load, but only after running for a while and I do not know why.
It will run for about 30 min to an hour or so with everything on and then a small surge (throttle kicks back and forth about 4 times fast) then shuts down.
After this first run I can restart it but it will but not last as long at all with a load or a long rest.
I ran it with no load for about 4 hours with out it shutting down.
Nothing is blocking the cooling intake or exhaust, or the fins of the blowing (cooling) wheel.
The oil level is just a hair under the full mark.
New plugs, fuel filter, carb, and air filter.
the voltage is at 120 and the Hz is 60 and does not change with a load. After it shuts down the first time and I restart it the voltage can go from 117 to 123 and the Hz from 59 to 61.
The compression is at about 120 psi and the generator brushes are at 11/16"
I am now looking at the Regulating Module only be cause it controls shutdown for every issue and is out of spec when it comes to shutting down RPM.
The book says that it should shut down at 2700 but it shuts down at 2200 so who knows if it is working right. Any ideas?
squeakkos wrote: check the cooling system / radatior is clear mine had a bild up on the fins and would not let the air pass. had to go underneath the coach to see it.
This Onan model is an air cooled model and I found no air path restriction there either. Thank for the reply anyway.
Magician wrote: Is the gennerator giving an error code ( lights blinking on your start switch) ? If so, what is it and what does your manual say?
Magician
No, when it shuts down the light just goes out with the power. If there is a way to get the code after this I am not aware of it.
Thank you for your reply.
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