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Old 06-06-2012, 03:14 PM   #1
Sean Marconette
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Default Onan 7000 Generator problems

Has anyone had a problem with an Onan Marquis Gold 7000 HGJAB with overheating? If I run my generator for 15-30 min, and shut it off it will not restart, it throws a code 37 (Invalid Configuration Fault) When it cools down it will restart. It only has 95 hrs on it, and it looks like the previous owner had the same issue. I have been unable to find anything on the web, other than possibly a circuit board is overheating, and has to cool down. It is a 2006 model. It runs great and has no other issues unless I shut it off and make a pass, and then try to restart it. Once it is running I can run it for a race weekend without even a hickup.

Thanks for any help.

Sean
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Old 06-06-2012, 03:40 PM   #2
Ed Fernandez
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Default Re: Onan 7000 Generator problems

Reach out on here for Rich Beibel and /or Matt Shurman.They both race in the Super catogories.They're generator guys.




2 more to go.
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Old 06-07-2012, 10:27 AM   #3
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Default Re: Onan 7000 Generator problems

Thanks Ed. I contacted Rich and have a direction to look for the problem now.

Sean
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Old 06-07-2012, 10:56 AM   #4
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Default Re: Onan 7000 Generator problems

Sean.....One other thing you can check...but it rarely happens...

The air inlet for cooling is directly in front and below the aluminum base tray.

If a rag or some paper or something else gets sucked up in there it can block the air flow and cause the unit to get very hot.

There is a fan blade attached to the underside of the generator end. It sucks air up and in for cooling.

We had one racer who had something making a nest up in there and it blocked the air flow. Probably a chipmunk or mice or a bird.....

DON'T put your hand up in there when it's running!!!! and don't leave a rag under the unit for checking the oil.......

The suction will take it right out of your hand when it's running......


and Ed....Please spell my name right....Biebel, like Diesel and Spiegel........and contrary to what the announcers have said for 40 + years.....my family pronounced it......BEE-BULL NOT BIBLE....LOL

I was told that the announcer...probably Dave Mclelland at the time said something like...how can you beat a guy named BIBLE on Sunday......Well you couldn't on that particular day.....that was always very funny to me.....
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Old 06-07-2012, 11:31 AM   #5
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Default Re: Onan 7000 Generator problems

I bought a new trailer last year and had the same issue, overheating problems. One of the Cummins guys looked under the trailer and told me there was nothing directing the heat away from the cool air intake on the bottom. I made a duct out of aluminum and it solved the problem. Miine did the same as yours, shut it off and would not restart but it usually ran all night. Good luck!

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Old 06-07-2012, 11:36 AM   #6
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Default Re: Onan 7000 Generator problems

Thanks Rich,

I will look into making sure no obstructions, and no nests or rags too.

Sean
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Old 06-07-2012, 12:51 PM   #7
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Default Re: Onan 7000 Generator problems

This model Onan does NOT have a high temp shutdown. If they shutdown or won't restart it is not because of any specific safety shutdown built into the machine. It's more like the machine just got too hot and something fails to operate because of the heat.

And yes they do need to NOT suck up their own hot exhausted air.

They had some of these units mounted under the back end of work Vans. They released an air deflector to direct the hotter air away from the front of the machine....I installed a few.

Most larger machines and diesels DO have an over temp shutdown. These would be liquid cooled and have a coolant sensor....

Big generators all have safetys as we call them. L.O.P. Overspeed, Over Temp and more.......all to protect a big dollar unit....

W
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Old 06-07-2012, 01:25 PM   #8
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Default Re: Onan 7000 Generator problems

Dennis and Rich,

There is not a divider or ducting, so chances are it is recirculating the same heated air, and just heat soaking everything. It looks like when the trailer was built they just windowed a hole under the generator in the plywood. I found info on the web about the ducting kit that was being installed. So definitely a trip under the trailer is in order to rule out what you guys have pointed out here.

I really appreciate the advice and help.

Sean
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Old 06-08-2012, 09:11 AM   #9
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Default Re: Onan 7000 Generator problems

Checked for rags, nests in the fan. It is clear. With it running, it was definitely recirculating it's own air. Installed baffle to correct. Shut it off and same thing. Code 37. Pulled control module and heat sink was very dirty. Cleaned heat sink and reassembled and still code 37. Looks like the module is bad. Probably too many overheating cycles on it. All wiring connections clean and tight too.

Sean
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Old 06-09-2012, 07:07 AM   #10
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Default Re: Onan 7000 Generator problems

Part # 300-5047 You can expect to pay over **500 for one.

I have had them fail and can push on the lower right corner of the potting material...... and they work.....

The fuel pump/carb solinoid circuit fails.....usually....

I keep a known good used one around for testing.....

All it is is a PC Board.....in a tray.

The same part number is used for carb'ed models or EFI models.....
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