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aleman77x

ONAN Charging System ???

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aleman77x
I have a 4040 with a CCKA engine. The tractor starts and runs fine(with fully charged battery), after 10 min running, the headlights dim down to nothing and the tractor will not restart if shut off. I assume that I have a problem with the charging system. I searched the site for old posts and there were tons (archived posts are great), and found several charging system posts one specific(posted by AL 12/31/2000) explains how to check the CCKB system (I assume its very similar to the CCKA, if not exact), my problem is that I dont know how to get to the stator (nor do I know what it looks like), or the rectifier assy or regulator. Based on the above mentioned symptoms, I I think that one of those is my problem. I had the gas tank, steering tower, ect.. apart, but figured that I would consult more knowledgable people before I had the whole thing apart and found that the fix for my problem didn't require all of that work. I have the repair manual, but couldnt find them in there. Any help for identifiying my problem or where to look first would be appreciated. Thanks AL

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ambler
My onan book is at home. The stator is behind the flywheel where ac current is made by the flywheel magnets rotating past the stator. a couple of AC wires should feed out to the regulator/rectifier. get this pub Page 2-13 starts the charging circuit. http://www.simplicitytechpubs.com/6767PRINT/PDF_files/TP_500_504_00_LT_SA.pdf

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StanD
On the 4040 the rectifier/regulator is also behind the flywheel. Be careful & use a good puller to remove the flywheel or you will pull the threads or crack the flywheel. StanD

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UCD
First thing I would do is have the battery load tested. It might be taking a charge, but will not hold that charge under load. Then I would check out the chargeing system. You should have at least 13.5 volst going to the battery.

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aleman77x
Thanks for the help guys. I will load test the battery first, then take it from there. Maybe a stupid question, but can I get to the stator , rectifyer assy, by taking the skid plate off or do I have to take the ges tank off, ect, ect.. I was having trouble taking the flywheel cover off, while troubleshooting earlier. thanks again Al

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D-17_Dave
Sorry Al, but you'll have to pull the engine to do anything on a chargeing circut on a CCKA. My advice is to set up a test stand that you can run the engine on so you can diagnose and repair it before placeing it back in the tractor. Don't forget you can up it to a CCKB pretty easy if you can locate the parts. The extra 4hp really help. If you have to buy a stator then I would recomend getting the entire chargeing circut for a KB. It will let you mount the rectifier and regulator outside the engine for access later and give you a 20 amp charger instead of a 15 amp system.

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JP
So far all is great advice (as usual). Most all the parts are available (I stock a lot of them). Onan made it a little weird; The stator for the CCKB is available, NOT the flywheel. The CCKA Flywheel is, NOT the stator! I would look for AC voltage from the two black stator wires (if you can get to them...),if those prove OK, the put a rectifier/regulator like Kohler or even a Radio Shack 35 amp (I think it's full wave.... been a while). Dave's right with the HP increase, It'll take a while for you to lose that 'stupid grin'~ LOL. To do it 'right', The manifold, carb, air filter system, fan shroud & heat shields need to be changed. Let us know what you come up with! JP

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