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Case S

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AZ GARY

Member
I have a Case S with a 6V system which has been getting problematic. Presently I'm checking all connections. The battery is 1 year old but I realize it could be a problem. I'm thinking of getting a 12V battery and start it with that and just charge the battery after a few starts. It starts real easy. I will disconnect the 6V generator. Any big problems with this idea? I only take it to our show and drive it in the xmas parade so not started very much.
 
Only thing you need to do is add a ballast resister so as not to burn out the points and coil. O'Reilly's VR-1 work well.
 
Make sure you clean the ground at the tractor body. Also if you have those clamp on battery post connectors, they corrode on the inside where the cable is clamped.
 
I have an SC Case it cranks very well on six volts. You need to start by removing and giving the starter a good cleaning. Oil the bushings and wire wheel the nose and where the nose connects to the body and then where the end plate fastens to the body. These are all ground connections and must be clean. Before you stick the starter back in the hole. Use a small drum sander and remove all the rust till your down to bare metal. This is a important ground connetion that must be clean. Next get a new longer ground strap. Ground it closer to the starter making sure to clean down to bare metal. The positive cable needs to be "0" or "00" gauge without any bolt on style replacement cable lugs. Last step replace the large push button switch on the dash. They cost like $11 and the internal contacts do over time get badly pitted. Follow my advise and I bet it will crank like 12 volts.
 
Tractorguy2 is spot on!! 12V destroys starter Bendix drives & ring gears because they slam in so hard. And, as Tractorguy points out, proper size battery cable is a must. Battery cable is like water pipe, and battery voltage is like water pressure. The lower the pressure, the larger the pipe must be to deliver the same volume. Same with voltage, lower voltage, larger cable. Not using proper size cable in a 6V system is like a fire truck w/ a 1,000 gpm pump pulling up to a barn fire with 2,000 gal water in the back, then pulling out a garden hose.
 
ALL my tractor have been converted to 12 volts and the starter drive and ring gear have held up just fine for decades
 
Better hang on to that rabbit's foot & knock on wood everyday. I get the calls all the time. In some situations, especially the SC, the engine will turn so fast that the magneto impulse will not work. Having said that, we have a DC w/ dome pistons that I used to plow snow with. Out of desperation, I did convert that to 12V. However I did break a starter nose cone once.
 
Well good for you. I have around 30 tractor and all but one should be 6 volts but there not and have been switched to 12 volts decades ago and never had a starter problem. Be it an 8N or and Oliver Super 88.
 
i cleaned all the connections up to the starter and it works good now. I thought the way the volts dropped on the battery trying to start it,that the battery was bad. Good to always to check the basics first and in this case the cheapest.
 
I totally agree also, those tiny little engines start so easy with 6 volts why torchure the starter like that. very hard on Bendix. and ring gears. some people think they can do better than the factory did. I got a W9 mccormick and 6 volt spins that big engine over. I cant stand a 12 volt battery on a 6 volt tractor!
 
you can convert 100 tractor too... if they are sitting or used once a year good chance nothing will breaK!
 
Many I use every summer to cut rake and bale hay and ALL have 6 volt starters on NONE have any problem being converted to 12 volts and have not Had any PROBLEM in over 10 years
 
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