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SC starters on 6V 12V


 
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BoonvilleKid
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PostPosted: Wed Nov 28, 2012 8:59 pm    Post subject: SC starters on 6V 12V Reply to specific post Reply with quote

On one SC I have removed the starter and observed the ring or flywheel gear. This SC has 6V battery and generator. The teeth on the flywheel gear look like new. On another SC, I removed the starter and looked at the flywheel gear. This SC has 12V battery with alternator. The front of the teeth on the flywheel gear are badly worn down. It appears that about 1/4 of the width of the teeth has been chewed off. Is this condition due to using a 12V alternator/battery on a 6V starter?
 
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IH fan
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Location: Kansas

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PostPosted: Thu Nov 29, 2012 2:05 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

BoonvilleKid wrote:
(quoted from post at 23:59:55 11/28/12) On one SC I have removed the starter and observed the ring or flywheel gear. This SC has 6V battery and generator. The teeth on the flywheel gear look like new. On another SC, I removed the starter and looked at the flywheel gear. This SC has 12V battery with alternator. The front of the teeth on the flywheel gear are badly worn down. It appears that about 1/4 of the width of the teeth has been chewed off. Is this condition due to using a 12V alternator/battery on a 6V starter?


Something I'm very familiar with! Yes it most likely is due to the 12V. system, IF you did not change the field windings in the starter to 12v. when it was changed over. I have a 240U (same C-123 engine) that did the same thing. Starter drive would not engage the flywheel starter ring every time, would grind 2-3-4 times and finally engege almost every time I started it. Starter finally quit and when I took it to my local auto-electric guy, I told him how it had acted for years before it quit. He said the starter is spinning too fast before it engages so he installed 12v. windings in it when he repaired it and now it not only engages every time, but it starts quicker. Cost about $75 on top of the regular repair, so about $175 total, but it sure works great now.
 
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gene bender
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PostPosted: Thu Nov 29, 2012 3:29 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

Most of the time they have starting problems so they go to 12v instead of getting system fixed seems to be the way that 6v is old and gennys are out so lets update and go to alts and 12v. Weak batts and poor cables also bad bBendix all help to gring teeth of flywheel then 12v comes along and sort of finishes it.
 
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mkirsch
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PostPosted: Thu Nov 29, 2012 5:29 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

Or, it could just be that the Super C with the worn starter and ring gear has been started more times...

Or, it could just be that the Super C with the good gears has had them replaced at some point in its life...

6V or 12V has little or nothing to do with starter gear wear on a 60 year old tractor. Most 12V conversions were done long after the tractor stopped being the main power on the farm. By then the tractor had been started thousands of times. The number of 12V starts is a mere fraction of the number of 6V starts.
 
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John M
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PostPosted: Thu Nov 29, 2012 5:30 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

Ive seen tractors that have been on 6 volt their entire life wore that way.
 
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IH fan
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PostPosted: Thu Nov 29, 2012 9:18 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

John M wrote:
(quoted from post at 08:30:51 11/29/12) Ive seen tractors that have been on 6 volt their entire life wore that way.


If the starter drive is weak, it certainly will do that, and any tractor that old is probably worn to some extent. However, the 6v starter on 12v is kind of asking for the situation to be worse. Now, if my headlights were just changed to 12v, I'd be in even better shape, but I feel the starter situation is cured with the 12v field coil in it. I was woried I might have the ring worn too bad in a few spots to cause a problem anyway, but for the last year or so it has worked fine.
 
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Janicholson
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PostPosted: Thu Nov 29, 2012 10:25 am    Post subject: Re: SC starters on 6V 12V Reply to specific post Reply with quote

A new style starter drive with a much smaller spring, and a cushon pinion is a great solution and cures most issues with it. 12v on a 6v styarter is usually not a problem. Jim
 
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