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7500 Diesel Generator problems
07-25-2011, 07:36 PM
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#1
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Member
Join Date: Jun 2011
Location: Blue Springs, Missouri
Posts: 42
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My first problem with this generator with over 1850 hours. I started it as I normally would do and the priming light did not come on. It was hard starting and had to be restarted several times before it ran on its own. Once it ran it continued for about 1 hour before shutting down while under load of 2 AC units running to keep the coach cool. Then in trying to restart the generator the hard starting problem was again present, what needs to be done to eliminate this Onan 7500 Diesel generator problem?
Bentley 
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07-25-2011, 07:41 PM
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#2
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Senior Member
Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 1,648
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What codes are you seeing?
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KIX
2002 Ultimate Advantage 40J-Spartan-Cummins
2004 Jeep Rubicon 2004 Subaru Forester
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07-26-2011, 04:14 PM
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#3
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Member
Join Date: Jun 2011
Location: Blue Springs, Missouri
Posts: 42
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Codes, news to me, where do I look? 
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07-26-2011, 04:35 PM
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#4
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Senior Member
Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 1,648
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I don't have my Onan manual handy so I can only tell you that it is blink codes displayed with the light on the start/stop switch. Try a google search to give you specific directions.
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KIX
2002 Ultimate Advantage 40J-Spartan-Cummins
2004 Jeep Rubicon 2004 Subaru Forester
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07-26-2011, 10:46 PM
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#5
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Member
Join Date: May 2009
Location: Parker Az
Posts: 89
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when was the last time you serviced the filters / and did a service?
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07-27-2011, 12:07 AM
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#6
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Senior Member
Join Date: Apr 2011
Posts: 248
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Bentley, Look at this file and see if ti looks like yours, it maybe a little different. Read it over and you will have a better idea of the generators operation.
Dick.
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08-02-2011, 01:16 PM
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#7
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Member
Join Date: Jun 2011
Location: Blue Springs, Missouri
Posts: 42
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Well I broke down and took the Motor home to the Onan dealer and had it serviced. The code that came up was somewhat generic 36. They said it might have been bad fuel or something. Now it is totally serviced and runs great.
Bentley
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08-02-2011, 01:48 PM
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#8
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Member
Join Date: Jun 2011
Location: Blue Springs, Missouri
Posts: 42
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Airtool, that is the manual I have, thanks for sharing.
Bentley
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08-03-2011, 05:45 AM
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#9
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Senior Member
Join Date: Jun 2011
Posts: 468
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If it acts up again, look for a loose fuel hose clamp on the tank. It could be sucking air when your fuel tank is not full or parked unlevel. Under full load the generator is sucking harder than normal and can get air in the line. It took me quite a while to chase that weird one down.
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08-03-2011, 11:26 AM
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#10
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Senior Member
Monaco Owners Club
Join Date: Oct 2006
Posts: 734
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Glad you are back in operation. Mine performed almost exactly as you described and I eventually found a clogged fuel line. Looked for air leaks for days and finally found the opposite problem. 
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1998 Monaco Dynasty
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