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Questions & Answers
Have a onan 4500 watt generator on a bucket truck.
Onan units have a breaker switch on them that has to be in the right position or you get no power. Can't tell you for sure where it is on the 4500 but on the 4000 RV series it is tucked in behind the on board start switch
I actually have a Onan
It does sound like your fuel pump is having issues, or the relay that controls the pump is the culprit.
If you have one, put a multimeter across the fuel pump wires. Start the generator, you should have 12volts when trying to start, as well as when the generator is running. If you dont, then you are looking at a control relay failure. If you do have the 12volts, wait for the generator to start surging, and monitor the voltage. If it stays at 12, then you are looking at a failed pump.
If you post the Onan Model / Spec / Serial number, I may be able to find a service manual for you.
I have a Wen Power
check that the voltage regulator is in good working order,
check insure the governor is free from dirt and that the retainer light spring is not fouling , and check the volcanizing elements are not shot circuiting or the insulation is braking down
Our onan generator ran out of gas. we refueled but
No, not the filter, you will need to try to prime the carb better then with starting fluid, pour some gasoline down the carb, you may have to do this a few times, but everything will fire back up again once you get the air out of the system
Onan generator dies after 2-3 hours of running ,
This sounds like overheating. These small generators don't have overheating protection, but if a low oil pressure or low oil level is present it may be the reason for stopping.
Check the oil level in the starting conditions and again when it stops. It may become under the "stop" level and after some time the precipitated oil has reached the "start" level. The same may be with oil viscosity and oil pressure.
Try to add some oil or change the oil with bigger viscosity.
I have an onan 4000.
this may sound like a smart *** answer but turn on its side and shake it the low oil switch is stuck
ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?
Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.
Onan MicroQuiet 4000 Generator
Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.
My generator will turn over but wont start
Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta
Physical location of control board on an Onan 5500
It is right behind the start switch. There is one bolt that holds your start switch housing down, remove it and the housing. You will see the P1 connector with a lot of wires plugged into the control board
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