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Onan GGFD-5566872 Generator questions


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  #1  
Old 09-28-2015, 09:17:14 AM
FDChief FDChief is offline
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Default Onan GGFD-5566872 Generator questions

Does anyone have a service manual for this unit.
This unit is currently running on liquid LP, can it be switched to natural gas?
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Old 09-28-2015, 09:27:38 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan GGFD-5566872 Generator questions

I only have the GGFC manual. According to it you can switch.Probably require some adjustments. Eric and Gunny would be the ones to answer your question.
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Old 09-28-2015, 10:21:19 AM
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Default Re: Onan GGFD-5566872 Generator questions

Need to know the spec letter at the end of the model number. Eric woods has the service manual. If he doesn't see the thread we can pm him.
You're looking for 929-0502b or 928-0502e depending on the spec.
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Old 09-28-2015, 04:48:15 PM
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Default Re: Onan GGFD-5566872 Generator questions

It is spec B
Serial # H020404681
What year is this unit?
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Old 09-28-2015, 05:07:11 PM
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Default Re: Onan GGFD-5566872 Generator questions

August 2002.
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Old 09-28-2015, 05:54:46 PM
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Default Re: Onan GGFD-5566872 Generator questions

Chief,

Would it be possible for you to post a picture of your engine from each side? I was looking at something and it sort of appears your unit may have been dual fuel? Do you have a LP vaporizer on it now [re-read first post more carefully, answered my own question], plus additional (unused) plumbing and regulator?

Converting it won't be difficult.

Last edited by EricWood; 09-28-2015 at 06:30:52 PM.
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Old 10-01-2015, 05:40:28 PM
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Default Re: Onan GGFD-5566872 Generator questions

Chief,

Your fuel system wouldn't happen to look similar to this one, would it? (Dual-fuel, nat. gas regulator is unused/has a plastic cap in the end of it.)

Parts list I saw for your unit showed multiple plumbing schemes, which to me sounded like dual fuel. If it did look like this, you would just need to flip the unused regulator upright, connect natural gas (of sufficient pressure and volume of course), and have the gas dialed in to 5" WC going into the carb-mixer. I think there's a minor timing change, but I usually use a vacuum gauge to optimize the timing point.
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