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Onan 7.5 HDKAJ Code 3-13


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  #1  
Old 09-01-2017, 03:51:20 PM
155mm 155mm is offline
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Default Onan 7.5 HDKAJ Code 3-13

I have read thru, I hope, all of the HDKAJ posts and didnt see my error, so if there is a thread please point me in that direction.

Have a new to me camper,
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and it had this genny in it, with about 430 hours on the meter, HDKAJ ... C
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The problem I am having, it runs just fine until the outside temp is above 85*F, then it shuts down. Flashes 3-13.... 13 is undervoltage. The genny will do this code even when the breaker is shut off and the engine is cold. When the jenny runs, there is no issues pulling both AC units and the microwave all at the same time.

I dont know if the outside temp has anything to do with the shut down code, just giving all the info that I have.

The genny is buried in the front of the camper, so I have to plan on disassembling the front of the camp to work on it.

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It had a full service done (air filter, oil filter, oil, fuel filter, water pump belt, coolant tested) about 30 hours, 3 months ago.
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Old 09-01-2017, 03:59:23 PM
len k len k is offline
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Default Re: Onan 7.5 HDKAJ Code 3-13

Your gen is spec C, made July of 1996
Looking at schematic on pfd page 92 of service manual looks like this gen is an INVERTER type.

I see that it has a water temp sensor, could check that connections to it are clean.


Link to manuals on it.
http://www.twinslan.net/~n0nas/manuals/onan/

When in link press control-F bring up search mode. type in hdkaj and search on it

Should bring up several manuals, service, parts , install, operator.

Read the service manual. Error codes as usually at rear of manual.
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Old 09-01-2017, 05:26:53 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Could be something simple like a loose belt, there is no belt tensioning as such just 2 pulleys. I would also be checking that the rad is clean and there is no debris buildup impeding airflow. If you get the unit out it is fairly easy to get the panels off to access the internals. I have a HDKAT that I resurrected from the dead with a 1$ MOV. The question is , is the code the cause or the effect, ie is it shutting down because of under voltage or is it observing undervoltage as it shuts down from some non specified/monitored condition. I had this issue on another computer controlled Onan gen. Cheers Dan
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Old 09-01-2017, 07:27:25 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

It is acting the same, before and after the belt change, the rad was clean enough to see thru.
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Old 09-11-2017, 10:28:47 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Does anyone have a link for a hdkaj service manual that works? I have a intermittent code 11...over current.

timAZ
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Old 09-11-2017, 10:39:16 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Link has been down for a few days, server issues.

Read this , another link to manuals is near end.
https://www.smokstak.com/forum/showt...=155507&page=2
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Old 06-02-2018, 01:42:35 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Would like to repair this, need to know what size capacitor blew up.

If someone has one of this or has had one open with photos, I just need the numbers off the cap that is alone towards the top center. Yellow, looks like a peanut, not the red mov.
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Old 06-02-2018, 10:19:51 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

This is my thread on inverter guts https://www.smokstak.com/forum/showthread.php?t=166537
I would replace the mov just on general principles they are quite cheap and there is a part @ in the thread.
Couple of pics , cant see much. Cheers Dan
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Old 06-03-2018, 11:45:46 PM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Well, back to the drawing board...

replace the capacitor with a comparable replacement, now get a start, but only runs 3-5 seconds. Back to flashing 3-13 and 3-15 after shutdown.

I have the 611-1236 schematic, its a bit hard to chase voltage in 3-5 seconds.

Open to any ideas, I have the contact info for flight systems, will contact them tomorrow.
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Old 06-04-2018, 10:00:32 AM
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Default Re: Onan 7.5 HDKAJ Code 3-13

Flight Systems has nothing to do with inverter generators, they said 'proprietary parts' so unable to repair.

Will go back to town to search for MOV, probably strike out there.

Called local Cummins/Onan, oh we have that inverter on the shelf, we can deliver today for 1774.70.
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