Henry J Fate
Well-known member
- Joined
- Jun 14, 2018
- Posts
- 2,444
Hello Friends
Bought a 2001 Winnebago Brave 34T 4 months ago.in Very low milage and in great condition. My only problem is the generator. It's a Onan Microquiet 4000. 4Ky. Rear mounted splash lubed with under 400 hours on the clock. Recently serviced and runs like a top when it runs. Here is my problem.....
At about 75% or higher load in an 85F outside temp or higher, the generator shuts down and will immediately restart without hesitation. The shutdowns are consistent with engaging the stop button. No sputtering or warning signs just shuts down and free spins to a stop. Starts right back up and will continue to run under a light load but once the load is back to 75%, it will shutdown again. I have isolated all remote controls from the generator and it still shuts down. I am down to the units factory components at the generator. I have removed the start/stop switch from the generator and it meters good and feels good. I will test the generator this weekend with the switch out if the circuit. I have reviewed the wiring diagram and cannot identify a thermal cutoff switch anywhere. I have read that there is one but have not seen any evidence of its existence. I am reasonably certain that the shutdowns are thermally induced either by design or by a fault somewhere or both. I have noticed that when I am driving with the generator running under similar load that the generator seems to be a little bit more dependable maybe due to the fact that battery charging duty is switched to the coach engine reducing the load to the generator which in turn reduces heat. Air flow might be a factor also. Speaking of airflow... The airflow from the generator cooling fan is working great. All is clean and serviced
Any help would be appreciated
Thanks
HJF
Bought a 2001 Winnebago Brave 34T 4 months ago.in Very low milage and in great condition. My only problem is the generator. It's a Onan Microquiet 4000. 4Ky. Rear mounted splash lubed with under 400 hours on the clock. Recently serviced and runs like a top when it runs. Here is my problem.....
At about 75% or higher load in an 85F outside temp or higher, the generator shuts down and will immediately restart without hesitation. The shutdowns are consistent with engaging the stop button. No sputtering or warning signs just shuts down and free spins to a stop. Starts right back up and will continue to run under a light load but once the load is back to 75%, it will shutdown again. I have isolated all remote controls from the generator and it still shuts down. I am down to the units factory components at the generator. I have removed the start/stop switch from the generator and it meters good and feels good. I will test the generator this weekend with the switch out if the circuit. I have reviewed the wiring diagram and cannot identify a thermal cutoff switch anywhere. I have read that there is one but have not seen any evidence of its existence. I am reasonably certain that the shutdowns are thermally induced either by design or by a fault somewhere or both. I have noticed that when I am driving with the generator running under similar load that the generator seems to be a little bit more dependable maybe due to the fact that battery charging duty is switched to the coach engine reducing the load to the generator which in turn reduces heat. Air flow might be a factor also. Speaking of airflow... The airflow from the generator cooling fan is working great. All is clean and serviced
Any help would be appreciated
Thanks
HJF