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Old 07-19-2016, 12:17 PM   #1
National RV Owners Club
Join Date: May 2016
Location: Milton, Florida
Posts: 93
What Cap is this?

I have a Generac 5500 Generator in my 1999 National Dolphin. I have a question.
If you are looking at the Generator, there is the oil filler cap and the oil drain cap on the left side of the Generator

If you look on the right side of the Generator, there is also an oil cap that is the same color (yellow) as the oil filler cap.

Question: Is oil supposed to go into the cap on the right side?

What is the cap on the right side used for?

Thanks.. I'm going crazy because I have never put oil in it and hope that I don't screw something up if there is supposed to be oil in it.


Can't get the pic to come over. Sorry.

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Old 07-19-2016, 01:54 PM   #2
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Join Date: Jul 2014
Posts: 11,476
The other cap is just another way to add oil.
I add oil in the right cap, while checking it in the dipstick cap.
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Old 07-20-2016, 07:39 AM   #3
National RV Owners Club
Join Date: May 2016
Location: Milton, Florida
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What Cap is This?

Thank you for your reply. I just knew that this would break something if I didn't put oil in it.
Now I feel a little more at ease.

If I have an oil leak and it looks as though it is leaking in the rear of the unit, what would be leaking?

How hard is it to move the generator out to get to the rear of the unit to see if I could find the leak and get it repaired? Or should I just take it to a mechanic that would repair it?

Thanks again for your answer.
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Old 07-20-2016, 08:00 AM   #4
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I took our generac out of our old gulf stream a few times. Ours also had an oil leak but I could never pin point it. I would just add more or change it. Although it leaked and I went through two starter motors, the thing ran to right around 8000 hours. To tell you the truth, I plain old abused the thing and it just kept going! If it wasnt for the oil leak, it was a great gen. four bolts, a fuel line and a couple electrical connections and its out. The hardest part if lifting it or dropping it out. Ours lifted out and I simply used some wood blocks, a floor jack and believe it or not, my kids little red wagon was the perfect height to slide it out on to and then I could roll it around and service it right on the wagon.
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Old 07-20-2016, 08:20 AM   #5
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The oil cooler lines are a common source of oil leakage. I had mine replaced last year. I also didn't realize that a valve adjustment is required every number of hours.
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