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Old 06-18-2021, 12:43 AM   #1
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7.5kw Onan QD Genny problems

So my Genny starts fine, but shuts down on its own all the time.

I see 2 blinks when I check code and hit prime button again and stops blinking. I think that means “Low Oil Pressure”

There is no rhyme or reason to when it shuts diwn. Under load or running idle. Sometimes 5 minutes sometimes 20 minutes.

I have to check the lights on the genny itself because I have no light on my internal switch any more.

It has been going on for about a minth regularly. Before it would do it once, then run fine.

Changed oil/filter, air filter, coolant flysh, and fuel filter - no change

Thoughts please

Thanks
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Old 06-18-2021, 06:57 AM   #2
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Old 06-18-2021, 11:38 AM   #3
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Quote:
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When I push down 3 times, I get nothing. When I push 1 time I get 2 blinks. When I push the second time the 2 blinks go away. When I push the 3rd time I get my 2 blinks back.
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Old 06-18-2021, 12:35 PM   #4
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Quote:
Originally Posted by SKP Kirk View Post
Good info! Thanks Kirk!
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Old 06-19-2021, 06:24 AM   #5
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If the code the genny is flashing on auto shutdown is low oil pressure you might check the continuity of the wire going to the oil pressure sensor. If the oil pressure switch looses continuity the genny computer module thinks the generator has lost oil pressure and auto shuts it down.

This happened to me and was very inconsistent like most things electrical. I will warn you that the oil pressure sensor is very difficult to get to. It was impossible for me to get to the oil pressure sensor to tighten the small nut securing the wire to the sensor.


The proper procedure to get to the oil pressure sensor is to remove the radiator and exhaust muffler and then remove the plastic housing surrounding the lower part of the genny. That is a LOT of work.
What I did was to cut a hole in the plastic housing just aft of the oil sensor large enough to get a small open end wrench on the oil sensor wire nut and tighten it through that hole. This must be done underneath the coach. I saved the cutout I made and epoxied it back in. That's important because that plastic shroud directs airflow to the radiator.
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Old 06-19-2021, 07:51 AM   #6
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The most common cause of that shut down code is low oil level. Make sure it's full on the dipstick. If its low by much you will get shut down when the motorhome is in a turn or otherwise slightly off level. They are pretty sensitive to oil level.
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Old 06-19-2021, 12:41 PM   #7
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2-blinks = low oil pressure
Could be actual low oil, or maybe a bad or dirty oil filter, or a faulty sensor or sensor wire.
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Old 06-19-2021, 01:01 PM   #8
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If oil level is good and all other things appear normal, I would crawl under the coach and disconnect power to generator for 30 mins. I would then wire brush corrosion off cable ends and cable stud mounts. Then reconnect. Hold down start button for 60 seconds and proceed to start. See what happens. I have a 7500QD and had a similar issue. The only way to clear codes is to disconnect power. I got this tip from an aviation mechanic who said they do this all the time to clear codes on planes. It worked for me.
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Old 06-20-2021, 09:11 PM   #9
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Quote:
Originally Posted by timjet View Post

What I did was to cut a hole in the plastic housing just aft of the oil sensor large enough to get a small open end wrench on the oil sensor wire nut and tighten it through that hole.
Thanks for the info. My genny is not on a slide so working on it will be tough.

You wouldnt have a pic or design sheet showing where this sensor is? Or the oil pump?

I was thinking of pulling the genny out through the bottom and doing a lot of maintenance but if I can fix this without pulling it, that would be better.
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Old 06-20-2021, 09:20 PM   #10
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Originally Posted by Mile Marker 42 View Post
If oil level is good and all other things appear normal, I would crawl under the coach and disconnect power to generator for 30 mins. I would then wire brush corrosion off cable ends and cable stud mounts. Then reconnect. Hold down start button for 60 seconds and proceed to start. See what happens. I have a 7500QD and had a similar issue. The only way to clear codes is to disconnect power. I got this tip from an aviation mechanic who said they do this all the time to clear codes on planes. It worked for me.

Can I just use my battery disconnect or do I have to disco cables on genny? Also, won’t the genny start if I hold down start button for 60 seconds? Or am I misunderstanding?

My genny is not on a slide so access is an issue.

Thanks for the help

Thanks
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Old 06-20-2021, 09:24 PM   #11
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2-blinks = low oil pressure
Could be actual low oil, or maybe a bad or dirty oil filter, or a faulty sensor or sensor wire.
Thanks Gary. Oil level is good, new filter too. No idea where sensor is as not on a slide. I am thinking oil pump but would love to check the sensor if I can find it
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Old 06-20-2021, 09:26 PM   #12
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Originally Posted by hohenwald48 View Post
The most common cause of that shut down code is low oil level. Make sure it's full on the dipstick. If its low by much you will get shut down when the motorhome is in a turn or otherwise slightly off level. They are pretty sensitive to oil level.
Thanks. Oil level on stick is good. Just changed it. Rig is level & still having the issue
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Old 06-21-2021, 12:54 AM   #13
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Can I just use my battery disconnect or do I have to disco cables on genny? Also, won’t the genny start if I hold down start button for 60 seconds? Or am I misunderstanding?

My genny is not on a slide so access is an issue.

Thanks for the help

Thanks
Holding button down doesn't start it. It primes it turning off battery disconnect doesn't clean corrosion off everything nor will it clear the codes.
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Old 06-21-2021, 01:43 AM   #14
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Holding button down doesn't start it. It primes it turning off battery disconnect doesn't clean corrosion off everything nor will it clear the codes.
ok so you mean hold the switch down in the fuel prime position and not the start position? and good point on the cabes/disconnects
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