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Old 06-30-2015, 11:24 AM   #1
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ONAN 7500 Quiet Diesel

Unit has been shutting off periodically. Changed oil and filter recently and now shuts off after running a few minutes. Indicates low oil pressure on led readout. Any ideas?
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Old 06-30-2015, 11:32 AM   #2
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Possibly a bad oil sending unit if that is the code it is putting out.
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Old 06-30-2015, 05:56 PM   #3
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Sounds like either low oil or a bad pressure sensor, but the fact that you just changed it is worrisome. Right viscosity oil? Correct filter? No oil leaks?
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Old 07-01-2015, 07:33 AM   #4
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All parts correct. Wondering if oil filter may be defective even though I've never seen one bad. Changing fuel filter today. Don't see this having anything to do with it.
Seems oil pressure sensor could be the problem. Guess I'll have to take to ONAN to check. Thanks
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Old 07-01-2015, 07:34 AM   #5
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Don't know how to check sensor or oil pressure. Will have to take to ONAN I guess. Thanks.
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Old 07-01-2015, 07:36 AM   #6
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Fan Belt....????
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Old 07-01-2015, 07:44 AM   #7
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You can unscrew the sensor and screw in a oil pressure guage ( you can get one most anywhere Auto Zone O'Reillys) that way you will know if it is the oil pressure and you will know exactly how much oil pressure you have. Some people buy a "TEE" and put in to have both a light and the guage.

Hope this helps.
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Old 07-01-2015, 08:18 AM   #8
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All you ever wanted to know about the Onans under RV SYSTEMS!
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Old 07-01-2015, 11:33 AM   #9
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Quote:
Originally Posted by Gary RVRoamer View Post
Sounds like either low oil or a bad pressure sensor, but the fact that you just changed it is worrisome. Right viscosity oil? Correct filter? No oil leaks?

X2! Plus, did you check to be sure the oil is up to the full mark?
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Old 07-01-2015, 10:09 PM   #10
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First question is what code is the genset showing. On the generator itself momentarily push the stop button then read the first code blink. Should be either 1 or 2 or 3 blinks. Then push the stop button again and read the second part of the code, it may be one or two digits. Then check the owners manual and see what the error is. It won't tell you exactly what is wrong, just the subsystem causing the shut down.

I recently had a error code that told me the coolant temp sensors system lost temp sensing failure of 5 minutes auto safety shut down. Turned out my temp probe was failing.

Hope this helps.
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Old 07-03-2015, 05:27 PM   #11
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Just call the Onan generator tech at Phone Number 763-574-5000 and ask for the generator guy.

I had a problem with mine after I had the oil and filter, air filter, and all the coolant changed. The generator guy told me I had a vapor lock in the coolant line. I pulled the line farther out of the access hole and sure enough a big burp came out. Generator has worked fine ever since.
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Old 07-04-2015, 09:41 AM   #12
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The coolant lines on the Onan7500 are notorious for the air bubble problem, but this report is for the low oil pressure error code. There aren't any hoses to trap oil bubbles!

A bad filter is a remote possibility, so I would change it before spending big bucks at Onan.
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Old 07-04-2015, 04:45 PM   #13
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Gary RV Romer: I know it is low oil pressure, the point you missed is that the Onan Repair tech can diagnose the problem for him for free. The tech can point him at a solution quicker than trying to replace parts that might be good.
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Old 07-06-2015, 10:06 AM   #14
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the point you missed is that the Onan Repair tech can diagnose the problem for him for free.
Free? Your Onan shop must be really nice guys. Mine doesn't do anything for free. Sure, they can tell you (even over the phone) that a low oil pressure code means low oil pressure. The question is why, and that requires labor as well as expertise to isolate the cause.
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