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Old 06-04-2023, 03:42 PM   #1
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Onan 12.5 Generator Service

I have seen several posts about servicing Onan generators with attempts at writing a walk thru for service. I just completed service on my 12.5 hoping the pictures assist.


1) Once you have the cover off, drain oil remove dip stick oil will drain faster, R&R oil filter. Refill oil 6 quarts



2) Remove three bolts holding coolant reservoir, leave cap on and remove, leaving all coolant lines attached.



3) Air filter can now be accessed, R&R air filter. Be sure to place cover with one way valve facing down


4) Fuel filter remove two bolts on side and remove filter, place over oil drain pan and R&R lines (you will note the lines are different sizes) they can't be installed "backwards"


5) I leave the fuel filter out to check for leaks


6) Push and hold "off" switch after about 2-3 seconds you will hear a click and the fuel pump will run. (generator won't start) Hold for 15 to 20 seconds checking for leaks and re-priming filter.



7) Start generator, check for oil leaks, fuel leaks and general operation.


Congrats you saved $$ and now your doing your own basic generator service.


https://drive.google.com/drive/folde...3Te48JpYbNfXCk
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Old 06-05-2023, 12:11 PM   #2
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