Watts Onan Portable Generator - 4000 , Model# 5500 - Answered Questions & Fixed issues

We hold parts for your Generator and have a whole Help Center dedicated to helping people fix their Portable Generators. If the answer is not there, we have Generator Engineers who can help. Check it out on our site. https://www.generatorguru.com/5gf-lde/ Parts Spares for Generators and Small Engine Machinery

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

hi 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

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

This might sound dumb ... is the fuel valve turned on?

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.

sounds like your coil is done

this may sound like a smart *** answer but turn on its side and shake it the low oil switch is stuck

It's getting hot and shutting down

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.

First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

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.

http://www.cumminsonan.com/locator The A1 controller is likely suspect.

sounds like coil

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

Spark Plug # RS17YX for Onan 167-0272 on RV Gensets ...

www.partsfortechs.com > Home > Generator Part Generator Parts Spark Plug # RS17YX for Onan 167-0272 on RV Gensets ... for this plug require the spark gap to be set at .025" (25 thousandths of an inch).

Onan Gen HGJAB What is the best spark plug and gap? - Heartland ...

https://www.heartlandowners.org/.../39632-Onan-Gen-HGJAB-What-is-t... Jun 8, 2013 - 3 posts - ‎3 authors Also what is the the correct gap on the plugs? ... brands · Generators; Onan Gen HGJAB What is the best spark plug and gap? ... Gap: 0.025

What is the model? Chances are the carb needs cleaning or replaced.

CHECK BATTERY, AND SOLENOID FIRST

Could be or the fuel pump gummed up. Pull off fuel line to carb, unplug fuel pump and conenct direct to battery, see if fuel comes out the line (catch in a container) make sure when you conenct to battery no sparks near the open fuel line. If no fuel replace pump, if fuel pull car apart

Over crank is failure to start, check fuel and ignition, why it isnt starting