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Old 07-02-2016, 08:36 PM   #1
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Unhappy Generac Quietpact 55 generator

Have a 2003 generac quietpact 55 generator that was not producing power. Took in for maintenance and they replaced the regulator, start/stop switch on the generator, changed oil, and filter. Generator is now producing power at the needed 120 voltage but shuts down after about 10 minutes of running under electrical load of air conditioners on. Generator has less than 300 hours. Any thoughts on possible reason(s) for the shut down? Any and all suggestions would be greatly appreciated.
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Old 07-02-2016, 09:26 PM   #2
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Generators usually have built in safeguards to prevent damage. On Onan generators, some models shut down if they think oil level is too low, which sometimes just means you're going around a long curve and the oil sloshes to the side of the crankcase. Another safeguard is often a high temperature sensor. You might check that both the oil and temperature sensors are working properly.

A cracked fuel line can cause the fuel pump to suck air and starve the engine, but I'd think it would shut down before the 10 minute time. You could test by connecting the generator fuel line to a can of gas and see if it runs beyond the 10 minute mark.

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Old 07-02-2016, 09:27 PM   #3
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Perhaps this unit is gasoline powered?
I notice in the spec. it is supposed to have a low oil shut off, and a high temp shut off. Does it sputter and quit or just suddenly stop?
Does it have the diagnostic panel, that offers a fault code?
Since they changed the oil, we're guessing you checked the oil level, probably a dip stick?
Is the unit ventilated properly? There should be holes cut out under the unit in the floor of the coach. Visually check those openings for debris or obstructions with it off. Saw one once that had sucked a plastic grocery sack up in the inlet that had been blowing around.
With it running there should be a generous supply of air sucking in and warmer blowing out.
Is the factory cover on it? Air cooled generators often require the covers on and panels closed for proper air flow over the finned heat sources.
Will it run any longer without the A/C load on it? Say partially loaded.
How long must it sit idle before it will start again?

Best of luck.
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Old 07-02-2016, 09:44 PM   #4
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So I have a family member who had a Generac that's still under warranty... his uses oil.. and when it gets low on oil it shuts down... hes had it into 6 different warranty stations and each time they do the same things as authorized by Generac... each time they tell him he's putting too much oil in it... yet he measures the oil exactly at an oil change... each time they really don't fix it... because all they do is the same thing over and over because that's all that Generac will approve... when the warranty station calls, they only approve the same thing... he finally gave up... took it out.. got his money back and bought an Onan...

My point here... is that the warranty station is only approved to do a short list.. and they really don't find and fix the problem..
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Old 07-03-2016, 07:49 AM   #5
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I had a bad oil leak in my Generac and had it repaired. Turned out someone had previously replaced the oil cooler lines with rubber hose that got swollen from the oil and they were leaking like a sieves. The facility that did the repair, once the generator was reassembled with the correct parts, ran it on their test stand at full load for several hours to make sure all was OK. Did the facility that did your repair work do something similar? If so, they should have caught this issue or the issue is specific to the coach installation.

Also, if you go under it while it is running there should be a lot of air blowing out the bottom from the cooling. If not, than check for obstructions as mentioned in a prior reply.
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Old 07-03-2016, 08:00 AM   #6
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Many years ago, when multi grade oils weren't as commonly used as they are today, we had a lot of trouble with oil that would start out fine, but in use would turn into something with the consistency of water. Probably capable of lubricating fine still, but the low oil pressure switches on the generators didn't care for that thin oil at all, and would shut them down.

All of which is the long way around to wondering about the oil that's been installed in this generator, as well as leaving a question about the calibration of the low oil pressure switch. If somebody has put oil that's of the wrong type in the gen set, or if the oil pressure switch is bad, either could cause the gen set to do as described.
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