Posted by tractorguy2 on June 08, 2017 at 21:08:59 from (64.147.39.177):
In Reply to: 12 vs 6 posted by Revy_Ajax on June 08, 2017 at 10:45:07:
My dad has a 641 and two of my friends. All on six volts. All three crank right over and start fine. I would start by checking out the starter. Making sure it has good bearings and brushes.
The battery cables need to be 0 or 00 gauge. I would get a longer ground cable and ground to a main casting not to the rusty battery box. Replace the starter solenoid. The internal contacts could be burnt and not allow the full flow of six volts to the starter.
I have two Case SC tractors. My 1941 has a 12 volt generator. With the original Autolite six volt starter. I have had zero problems with the starter. I've owned it for 29 years. My 1948 had a 12 volt battery with the original 6 volt generator. I put it back to six volts. I bought a new battery. Made all new cables from 00 gauge. Replaced the big push bottom. Cleaned and oiled the starter. I also cleaned the starter mounting of rust. It cranks right over with no trouble. Almost as good as my 41 on 12 volts. The six volt generator still works.I've owned this tractor for 26 years. You can buy conversion kits. You need to figure out first if you have a jubilee, 600, or a 601 series. I have never used a conversion kit. I make my own brackets and buy a three wire alternator and a diode plug.
Before converting. I would at least clean and check out the starter and replace all the battery cables.
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