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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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6Volt or 12 Volt oliver

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Wendy H

10-22-2007 09:13:11




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We just bought a 1947 Oliver OC3 and I put in new piston rings now the darn thing has a really hard time turning over. With the new higher compression the 60 year old starter just can't handle it. The old battery has no markings or stickers on it to tell what the volts of it are and the new 12 Volt battery we think fried the starter all together. Oops! Turns out the starter was discontinued in the 50's!!! Any sugestions?

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fleetlinemechanic

10-24-2007 07:34:26




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 Re: 6Volt or 12 Volt oliver in reply to Wendy H, 10-22-2007 09:13:11  
Typically a 12-volt battery will not ruin a 6-volt starter system, as this requires less amperage. You should only crank the engine for 10 seconds at the most. You might find that your brushes are worn out.



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bradk

10-22-2007 17:54:48




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 Re: 6Volt or 12 Volt oliver in reply to Wendy H, 10-22-2007 09:13:11  
Good advice from these guys.When tractors are changed from 6 volt to 12,the 6 volt starter is used with no mods.Like J said,it's actually easier on the starter because less current is required to turn engine over on a 12 system.

If you don't want to tackle the starter overhaul,any good starter/alternator repair shop can do it reasonably.Good luck ~brad



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J Schwiebert

10-22-2007 17:08:26




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 Re: 6Volt or 12 Volt oliver in reply to Wendy H, 10-22-2007 09:13:11  
12 volts on that started is not as hard on the starter as 6 volts Do like Centaur said to start with. There was also a change made in the little starter on the oC-3. If you ask any more questions please give the model number of the starter. Do you have a voltmeter? If you are going to play with this stuff spend $20.00 for one. They are also handy to check household wiring. J.



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CENTAUR

10-22-2007 13:25:23




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 Re: 6Volt or 12 Volt oliver in reply to Wendy H, 10-22-2007 09:13:11  
How do you know it is fried? If it were mine I would take it apart.First I would scribe lines where the metal PARTS join together so you can put it together again.You may only have worn out brushes.Even if the field coils are grounded from overheating they can sometimes be taped with a cloth tape or replaced. CENTAUR



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ACEd

10-22-2007 10:20:58




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 Re: 6Volt or 12 Volt oliver in reply to Wendy H, 10-22-2007 09:13:11  
early gas crawlers should be 6 volts, diesel probably 12 volts - 6 volt battery should have 3 filler caps - 12 volt should have 6 caps - though lots of 12v now are semisealed and all you see is 6 vents. Either way, you don't want to keep grinding on a starter till it gets hot - typically they say 30 seconds maximum especially if you are turning a 6 v starter with a 12 v battery. Try a local auto electrical shop - maybe associated with a NAPA or farm store - they can be rebuilt pretty easily if you can find someone old enough to know what they are doing - typically $25-50 range. Or try eBay, but I would assume what you get there might need to be rebuilt too unless otherwise clearly stated. Maybe best to try Korves Oliver or Zimmerman Oliver-Cletrac - you can find them by Google. Rebuilding will still be best option in my opinion.

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