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06-30-2015, 10:24 AM
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#1
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Junior Member
Join Date: Jun 2015
Posts: 11
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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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06-30-2015, 10:32 AM
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#2
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Senior Member
Entegra Owners Club
Join Date: Apr 2007
Location: SW FL
Posts: 31,718
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Possibly a bad oil sending unit if that is the code it is putting out.
__________________
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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06-30-2015, 04:56 PM
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#3
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,676
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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?
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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07-01-2015, 06:33 AM
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#4
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Junior Member
Join Date: Jun 2015
Posts: 11
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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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07-01-2015, 06:34 AM
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#5
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Junior Member
Join Date: Jun 2015
Posts: 11
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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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07-01-2015, 06:36 AM
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#6
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Senior Member
Join Date: Jan 2010
Posts: 178
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Fan Belt....????
Larry
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07-01-2015, 06:44 AM
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#7
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Junior Member
Join Date: Nov 2012
Posts: 25
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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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07-01-2015, 07:18 AM
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#8
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Senior Member
Monaco Owners Club Texas Boomers Club
Join Date: Jan 2009
Posts: 2,529
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All you ever wanted to know about the Onans under RV SYSTEMS!
__________________
Hal & Ginny Miller '04 Beaver Santiam PRT40
'04 Saturn Vue - US Gear Brake - Blue Ox tow
3"girls" (2 Irish Setters - 1 Retriever) - RIP Annie & Emily (12/26/2017)
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07-01-2015, 10:33 AM
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#9
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,768
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Quote:
Originally Posted by Gary RVRoamer
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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X2! Plus, did you check to be sure the oil is up to the full mark?
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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07-01-2015, 09:09 PM
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#10
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Senior Member
Winnebago Owners Club
Join Date: Jul 2010
Location: Palm Harbor, FL
Posts: 405
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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.
__________________
Earl
05 Meridian, 39K, 350 CAT. '13 F-150 4X4, Blue Ox Aventa LX, Roadmaster 9160, 2018 Honda GL1800 Goldwing Tour, USAF Retired.
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07-03-2015, 04:27 PM
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#11
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Senior Member
Join Date: Aug 2010
Location: Oklahoma
Posts: 297
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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.
__________________
Retired Army, Disabled Veteran
Wife, me, and 2006 Coachman Cross Country 372DS makes three, Demco Kar Kaddy SS
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07-04-2015, 08:41 AM
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#12
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,676
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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.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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07-04-2015, 03:45 PM
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#13
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Senior Member
Join Date: Aug 2010
Location: Oklahoma
Posts: 297
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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.
__________________
Retired Army, Disabled Veteran
Wife, me, and 2006 Coachman Cross Country 372DS makes three, Demco Kar Kaddy SS
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07-06-2015, 09:06 AM
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#14
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,676
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Quote:
the point you missed is that the Onan Repair tech can diagnose the problem for him for free.
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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.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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