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Old 08-11-2018, 12:47 PM   #1
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Onan 5500 Marquis Altitude Adjustment

Is there a way to adjust the altitude setting on this generator. Right now, as shown in the picture, it is set for 0 ft. Any help would be appreciated.

Tom

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Old 08-11-2018, 01:11 PM   #2
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possible there was a knob on the bottom broken off, needed to be rotated to the right for higher altitude?
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Old 08-11-2018, 01:21 PM   #3
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I have never touched it. Been going to 8k feet every year, it runs fine, maybe rich, but o am ok with that for a week. Longer periods adjustment would need to happen. I think it is a screw on the bottom.

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Old 08-11-2018, 02:31 PM   #4
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Onan 5500 Marquis Altitude Adjustment

Tom,
I have the same generator and altitude adjustment knob. The only time Iíve adjusted it has been a few times the generator has been surging and not running smooth and Iíve changed the altitude setting just a bit and it corrected the condition and ran smooth. To adjust all you do is turn the black knob on the bottom. Thereís an indicator on the side of the knob. Itís not an exact measurement, but itíll get you in the ballpark. Iíd say donít touch a thing if your generator runs fine, but if itís not running quite right adjusting the altitude knob may correct the problem.
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