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Old 09-12-2016, 09:56 AM   #1
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My generator stops running when going over bumps, rough roads

My 5.5 Onan genset cuts off on its own if I am driving on a rough road (hard to go around these), go over a rough railroad crossing, hit a pot hole, etc. On a previous trip, one of the two 30 amp breakers would trip, but on this last trip, both breakers are still on after the generator stops. I am running 1 A/C, and, per FR advice due to known problems, have the vent on the A/C open, as opposed to closed which would direct the cool air into the overhead ducts. I also experience what sounds like the A/C almost shutting off, but staying on, and then quickly getting back to full capacity as I am driving along. Any help on this issue so I can stay cool while driving? (sorry, I put this post into the general discussion first by accident).
Thanks.
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Old 09-12-2016, 09:59 AM   #2
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Make sure your oil is right up to the full mark. There is a low oil sensor that might be cutting it off.
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Old 09-12-2016, 10:11 AM   #3
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Thanks. I check it regularly and it is maybe 1/4" below total full mark, but I'll put more in.
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Old 09-12-2016, 10:25 AM   #4
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Quote:
Originally Posted by salwolfe View Post
My 5.5 Onan genset cuts off on its own if I am driving on a rough road (hard to go around these), go over a rough railroad crossing, hit a pot hole, etc. On a previous trip, one of the two 30 amp breakers would trip, but on this last trip, both breakers are still on after the generator stops. I am running 1 A/C, and, per FR advice due to known problems, have the vent on the A/C open, as opposed to closed which would direct the cool air into the overhead ducts. I also experience what sounds like the A/C almost shutting off, but staying on, and then quickly getting back to full capacity as I am driving along. Any help on this issue so I can stay cool while driving? (sorry, I put this post into the general discussion first by accident).
Thanks.
We have had the same problem with our new MH. Thanks in advance for all the helpful advice. Deb
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Old 09-12-2016, 12:40 PM   #5
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I have a Generac that shuts off going down the road also. It starts right up again but will shut down again for no apparent reason. Oil is full and breakers are not tripped. Runs fine when the unit is parked. Any ideas?
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Old 09-12-2016, 12:47 PM   #6
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Many generators use a spring loaded, coil activated contactor in the transfer switch to transfer the electrical power to the coach once started.

I've seen some of these that 'bumps/rough roads' would jar the contactor enough to disconnect.

Just a possibility.
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Old 09-12-2016, 01:00 PM   #7
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It's worth a shot.
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Old 09-12-2016, 01:07 PM   #8
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Also, on the onan units they need a valve adjustment after the first 50 hours or so. The valves tighten up during breakin. That will cause a severe loss of compression.
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Old 09-12-2016, 01:33 PM   #9
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Maybe they are getting fuel starved - their fuel pickups are supposed to be at the 1/4 tank level, but maybe they aren't or the fuel was too low?
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Old 09-12-2016, 03:12 PM   #10
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As for mine, the fuel has been at least 1/2 tank if not more. Thought it might be a fuel filter problem but it only quits going down the road.
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