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Testing J D 332 Diesel Alternator..


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#1 Texas Deere and Horse OFFLINE  

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Posted September 09, 2013 - 10:48 AM

I have a 332 with the Yammar engine and need to check the alternator to see if it's good. When I got the tractor, the alternator was unplugged from the regulator and the the leads had been very hot were they plug into the regulator. I know there is a way to see what the Alt. is making, 110AC? Any help would be greatly appreciated! 

 

This alternator is externally mounted like a car alternator, from the factory.


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#2 twostep OFFLINE  

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Posted September 09, 2013 - 11:16 AM

Just to make it clear, you can run the engine, correct? I don't know but am interested to find out also but I would guess that you could put a multi meter on the two leads and see what voltage it makes... the next question is what SHOULD it put out??

 

Do you have a maker or spec for the alt?


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#3 Kyocum OFFLINE  

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Posted September 09, 2013 - 11:31 AM

Not sure what make alt they use on a yanmar but my kubota alt puts out 38 - 40 vac at wide open throttle.


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#4 Texas Deere and Horse OFFLINE  

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Posted September 09, 2013 - 12:21 PM

Just to make it clear, you can run the engine, correct? I don't know but am interested to find out also but I would guess that you could put a multi meter on the two leads and see what voltage it makes... the next question is what SHOULD it put out??

 

Do you have a maker or spec for the alt?

 

I will take a photo of the Alt. tonight and post it, but it's a replacement from JD so I was told.



#5 twostep OFFLINE  

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Posted September 09, 2013 - 12:36 PM

When I get my yanmar gas powered 400 running again I'll check mine... that could be a while though!!


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#6 boyscout862 ONLINE  

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Posted September 09, 2013 - 02:26 PM

There are a number of the Kubota service manuals in our library. Don't they have a trouble shooting guide in them. Most of my old engine manuals have detailed troubleshooting guides. Good Luck, Rick


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#7 Texas Deere and Horse OFFLINE  

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Posted September 09, 2013 - 03:02 PM

Thanks Rick, I didn't think to look there.. :wallbanging: :D

 

BTW. This is a John Deere with a Yammar Diesel, Not a Kubota. We don't have any manuals for JD products because of Copy Right issues !!



#8 boyscout862 ONLINE  

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Posted September 09, 2013 - 03:40 PM

Thanks Rick, I didn't think to look there.. :wallbanging: :D

 

BTW. This is a John Deere with a Yammar Diesel, Not a Kubota. We don't have any manuals for JD products because of Copy Right issues !!

I plead a senior moment. Good Luck, Rick

 

Our library is a great resource. When I can get my scanner working I will add some manuals to it.



#9 twostep OFFLINE  

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Posted September 09, 2013 - 03:48 PM

I looked through my CTM12 manual and it looks like there are a few different alts that were used.


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#10 olcowhand ONLINE  

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Posted September 09, 2013 - 03:53 PM

Brian's alternator does NO have built in regulator/rectifier, so it will put out AC.  How much is the question.


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#11 JDBrian OFFLINE  

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Posted September 09, 2013 - 07:01 PM

Brian, is this a permanent magnet alternator or does it have a field winding that needs to be energized to provide output. You should be able to measure the winding resistances and if it has brushes you should be able to check the condition of brushes and commutator. These basic checks should give some indication of what condition it's in. I don't have any info on the 332 electrical system.


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#12 olcowhand ONLINE  

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Posted September 09, 2013 - 07:16 PM

It's in my 430 factory service manual which also covers the 322, 330 & 332.  Test just like a Kohler stator.  Unplug the twin lead from stator.  Putting AC voltmeter across these terminals, at higher rpm's, you should get 30VAC or more.


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#13 Texas Deere and Horse OFFLINE  

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Posted September 09, 2013 - 09:39 PM

Thanks Guys, :thumbs: I appreciate all the input. I will check it tomorrow after work and see what it is putting out.



#14 Texas Deere and Horse OFFLINE  

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Posted October 09, 2013 - 07:33 PM

Finally got to check and the Alt.is putting out 27-28 volts AC at low idle and making 43+ at high idle.

My next question is that I read somewhere about installing something in the wiring between the Alt. and the Regulator to stop over charging, does anyone know what this is, a fuss or diode or what. Both my leads from Alt. have been very hot.

#15 Alc ONLINE  

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Posted October 10, 2013 - 05:38 AM

I've never saw a alternator that was set up like yours , if I'm understanding it right it has 2 ac wires like what I've seen on small engines that are come off the stator/flywheel but this type ( external mounted  ) I would have thought it had an internal regultaor or external with a field wire controlling the output . Hope someone can post a diag. of some sort of how it's wired . Might never work on one but still find it intrusting , good luck with it


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