Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Onan generator starts but stops after release of button

My onan generator starts when holding down the start button but quits after I let go. I do not have 18-22 volts coming through pins 1/7 at the board. When testing at the brushes of the generator I get no reading. I have cleaned the spindle of generator where brushes contact and cleaned the brushes, I have plenty of brush left with good springs. What else could this be, it seems like it should be something simple

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 12 Answers

SOURCE: Have an Onan RV generator. WHat kind of oil do I

30W

Posted on Apr 30, 2009

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erickg
  • 116 Answers

SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

  • 905 Answers

SOURCE: Gen starts and runs with rocker start button pushed in..stops....

Cleaning the brushes is used to address an AC output problem. If the generator would run for a few seconds after letting go of the button, then this might apply.

But, since yours is dying as soon as you let go of the button, that tells me that you are probably looking at a low oil condition, or a sensor / sending unit failure for oil level.

Without spec number, hard to remember if the sending unit is for low oil pressure, or low oil level. Either way, the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

Posted on Aug 25, 2009

  • 142 Answers

SOURCE: Onan Marquis 5000 generator. No gas going to the

12 V going to the pump, but is it turning (do you hear it running). If not change it.

Posted on Jun 13, 2010

  • 1 Answer

SOURCE: RV Onan Emerald 1 Generator

Check all the ground wires and make sure their not broken or loose. If the wires are good next check the neg. Wire to the coil. Too check the swiitch make sure you have continuity too all the post when the switch in the on position, this requires removing the switch.

Posted on Mar 15, 2011

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Gen starts and runs with rocker start button pushed in..stops....


Cleaning the brushes is used to address an AC output problem. If the generator would run for a few seconds after letting go of the button, then this might apply.

But, since yours is dying as soon as you let go of the button, that tells me that you are probably looking at a low oil condition, or a sensor / sending unit failure for oil level.

Without spec number, hard to remember if the sending unit is for low oil pressure, or low oil level. Either way, the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

Aug 24, 2009 | Watts Onan Portable Generator - 4000 ,...

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Only runs if I hold the start switch


The problem is that you are not creating voltage. Remove front cover. Place a volt meter on the breaker. Start genset and you will see no voltage present. The problem could be with the brushes, rings, rotor, stator, voltage regulator, or control board.

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6.5KW Onan generator. wont run when the start button is released


Flight systems can test the onan circuit boards. google them they will come up. First class operation my board was was checked out and back to me in about a week, They also sell new boards and deduct the 20 dollar bench fee if yours is bad and you buy a replacement from them.

Jan 08, 2009 | Watts Onan Portable Generator - 4000 ,...

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