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6V Starter

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jhorkey

06-13-1999 12:02:57




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I am having trouble with diagnosing my starter problem. The field coils do not have grounds or shorts. The armature does not have any grounds and the brushes appear in good shape. Yet when benching the starter with a 6V battery charger, the starter turns fast but can be stopped with very little force. What gives? Also what is an easy way of installing a starter. The Bendix drive is a pain to get by the flywheel.

Thanks

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Aaron Smith

06-15-1999 12:18:12




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 Re: 6V Starter in reply to jhorkey, 06-13-1999 12:02:57  
Even though it isn't shorted or grounded anywhere, doesn't mean that it's still good.. You could have a bad spot on the commutator.. There may not even be enough amps comming from your battery charger to keep it running good.. If you have a local electric motor repair shop in your area, they can fully test it to see if it's good or not. Keep in mind too that a new starter is around $200, and the cheapest place I could find a place to repair it was right around $190, so a new one would be a better deal. My mother owns a electric motor repair business and she couldn't even find a cheaper place to re-build it for her..

Getting them back in is a complete pain in the neck. If the bendix is engaged, i.e. all the way towards the motor, it will not fit back it.. You will have to try to disengage it.. I tried a 1250 rpm laythe and that wouldn't do the trick.. I had to take it apart and put it back together disengaged and tape the shaft to keep it from moving till I could get it back in the tractor. If you need info on doing this, let me know.. I've done it on 4 tractors now so it's becomming old hat :) ..

Aaron Smith

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ROF

06-18-1999 09:04:43




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 Re: Re: 6V Starter in reply to Aaron Smith, 06-15-1999 12:18:12  
AARON, If you have access to a high speed buffer or grinder with a wire brush wheel, you can use the speed of the wire wheel to reract the Bendix.
It works well for me. ROF



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Aaron Smith

06-18-1999 09:24:20




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 Re: Re: Re: 6V Starter in reply to ROF, 06-18-1999 09:04:43  
Yeah, we have a couple of them, but I didn't want to use the wire brush on it, because the brushes we use are used to gently scrape steel off of armature shafts.. So I didn't want to use it... Plus, in taking it apart, it gave me a chance to put some graphite on the bendix to keep it moving freely... For some reason, it kind of sticks a little bit part way down.. I don't know if it had a nick in it or what, but after I used the graphite, it moved alot better.

But yeah, you are right, if you have a buffer and the starter moves pretty freely, it's a very easy way to get it to disengage.

Aaron

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Mike S

06-14-1999 04:16:12




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 Re: 6V Starter in reply to jhorkey, 06-13-1999 12:02:57  
Don't know that much about repairing starters other than replacing bearings and seals and brushes, but I know that the starter will pull 100 plus amps when cranking so, while your battery charger does put out 6 volts at some amperage, it is not enough to supply the amps to keep it spinning when a load is applied. Bench test hooked to a fully charged battery and you should see quite a difference.

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jhorkey

06-15-1999 18:54:08




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 Re: Re: 6V Starter in reply to Mike S, 06-14-1999 04:16:12  
Mike & Aaron, I took it to a machine shop and had it retested. The new solinoid I bought was bad. What a relief. The best price I could find was $140. without the armature.

Thanks for the advice on installation. I still spoke a little French. thank again



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Aaron Smith

06-18-1999 09:31:53




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 Re: Re: Re: 6V Starter in reply to jhorkey, 06-15-1999 18:54:08  
Glad to hear it was just the solinoid. While still a little pricey, I guess it's better than $200 for a whole new starter!

I had a guy using my tractor all last year to cut the grass out on my property a little ways away from where I live.. He told me he couldn't get the starter to engage and brought the starter to me to fix it.. After I tested it, I couldn't find anything wrong with it so I took it out to the tractor and put it back in and turned it on and nothing.. So I too thought it was the solinoid, until I took a closer look and saw he had the dang battery in backwards.. As soon as I turned it around it turned over just like normal.. I always thought those starters would fire even if the polarity was reversed. Guess I was wrong! Anyway, Didn't mean to ramble on like that, just wanted to share one of my many starter replacement hassles.. Now I just have to get the ole thing to start up so I can cut my grass again!

Aaron Smith

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