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Starter/Generator problems


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#1 goldstar OFFLINE  

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Posted March 23, 2017 - 11:17 AM

i have a Simplicity 725 that i am restoring. I rebuilt the starter/generator. I replaced the brushes and

the bearings and the wiring looked real good. I put it back on and it starts fine but it is not putting out

any voltage at all. I tried running running the engine at full throttle but still no voltage. I sure would

appreciate any helpful ideas.                                                 

                                                                                                                                        Thanks,

                                                                                                                                      Goldstar

 



#2 jimmy G ONLINE  

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Posted March 23, 2017 - 11:29 AM

Are you checking voltage at the battery or the S/G?
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#3 secondtry OFFLINE  

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Posted March 23, 2017 - 11:36 AM

Have you checked out the manuals section. Top of this page third tab from the right. Don


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#4 jabelman OFFLINE  

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Posted March 23, 2017 - 11:38 AM

check the voltage regulator, sometimes you have to polarize the s/g too. I had a similar issue turned out to be 50 year old wiring, replaced all the wire worked fine after that
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#5 boyscout862 ONLINE  

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Posted March 23, 2017 - 03:17 PM

Jabelman is right. After rebuilding an S/G you should clean and adjust the regulator then polarize it. I have to do it on my 1973 Ford 2000 tractor whenever I have to replace the voltage regulator. Post some pics. Good Luck, Rick


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#6 classic ONLINE  

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Posted March 23, 2017 - 04:10 PM

I took my Delco starter generator completely apart, cleaned the commutator,sprayed out the generator housing and the armature with Lectra-motive electric motor cleaner, replaced the brushes and bearings, then reassembled it. I installed it on my PK along with an NOS Delco voltage regulator, and the starter generator works fine and charges the battery. My ammeter acts as it should and I have had no problems with it all winter. I never polarized the starter generator or adjusted the regulator. There are many things that could be giving you problems. The field coils could be grounding to the housing, so you should start there. There is a video on YouTube showing how to quickly check a starter generator out with a battery and jumper cables. If the generator checks out, move on to the regulator and your wiring. Make sure that you have it wired correctly, too.
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#7 classic ONLINE  

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Posted March 23, 2017 - 04:13 PM

Here's the video.

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#8 GWest OFFLINE  

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Posted March 23, 2017 - 04:19 PM

This is the only Kohler manual I have ever seen for the starter/generator.

http://www.wheelhors...-sm-1972-hrpdf/

 

Know nothing about them but was once told the regulator is automatically polarized in a starter/generator system by design once the starter is energized.

 

Garry


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#9 Bruce Dorsi ONLINE  

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Posted March 23, 2017 - 08:05 PM

Wow !    ....I've been testing s/g's for years by motoring them thru the Armature windings, but I never knew about checking the field windings as shown in the video.  ....This proves I'm never too old to learn. 

 

Thanks, Classic !!!


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#10 classic ONLINE  

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Posted March 23, 2017 - 08:30 PM

I came across this video and thought it would be a good idea to share it, Bruce. Cleaned and serviced, these generators work very well. The Lectra-Motive spray cleaner does a great job of cleaning the armature and the field coils, but doesn't eat away at the field coil insulation. Just let everything dry good before reassembly. You're right about never being too old to learn, Bruce. This little trick saved me a lot of aggravation!
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#11 jimmy G ONLINE  

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Posted March 23, 2017 - 09:09 PM

If it's got electric brakes it'll charge,thanks classic

Edited by jimmy G, March 23, 2017 - 09:10 PM.

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#12 classic ONLINE  

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Posted March 23, 2017 - 09:36 PM

You're welcome jimmy G. These old starter generators should always be disassembled, even if you find one that works like in the video. Rebuild kits are cheap, and if the commutator where the brushes ride is not badly worn and shines like a new penny, you'll be happy with how it performs.
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#13 MolonLabe ONLINE  

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Posted March 27, 2017 - 10:46 AM

Thanks for the video Classic, this old dog just learned a new trick!



#14 lrhredjb ONLINE  

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Posted March 27, 2017 - 12:09 PM

I read somewhere that Delco starter/gen brushes are made of a special material and they are not the same as regular motor brushes. Anyone have any knowledge of this?

Thks


Edited by lrhredjb, March 27, 2017 - 12:09 PM.


#15 Bruce Dorsi ONLINE  

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Posted March 27, 2017 - 03:48 PM

I read somewhere that Delco starter/gen brushes are made of a special material and they are not the same as regular motor brushes. Anyone have any knowledge of this?

Thks

 

The brushes for the D/R s/g's (and many automotive starters) appear copper or bronze in color, probably due to a high metallic content.

 

Brushes for some electric motors and most hand-held power tools are gray or black in color and are mostly carbon-based.

 

Consequently, the metallic brushes can handle higher amperages (for a given size) and are more durable than a carbon brush would be in the same application.


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