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Case Tractors Discussion Forum
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case sc polarity

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kirk wannemache

11-01-2004 03:45:25




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I read many past threads talking about this. They all seem different. I have a 1949 sc and I have the big wire (heavier guage) connected to the posative terminal. is this correct. Thanks




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other Will

11-01-2004 03:53:53




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 Re: case sc polarity in reply to kirk wannemacher, 11-01-2004 03:45:25  
Size of wire has nothing to do with it. On SC the negative post goes to ground. With 6 volt system both wires should be heavy.



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dctom

11-01-2004 07:13:26




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 Re: case sc polarity in reply to other Will, 11-01-2004 03:53:53  
ALL RACINE BUILT TRACTORS SC-DC-LA- WERE NEGETIVE GROUND, ONLY ROCKISLAND UNITS WERE POSITIVE GROUND DCTOM



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Roger (Mi)

11-01-2004 04:30:50




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 Re: case sc polarity in reply to other Will, 11-01-2004 03:53:53  
Nearly all of the tractors with generators had POSITIVE grounds. If you want the Case SC with a generator to be original, make it a positive ground. If the tractor has been converted to an alternator, it will need a NEGATIVE ground.



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other Sam

11-01-2004 06:22:29




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 04:30:50  
All DC and SC tractors came with negetive ground. All the books I have on them (early and late) say negetive ground. I have original DCs and SCs all with generator and with neg. ground.



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Camboted

11-01-2004 04:43:51




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 04:30:50  
Roger, I'm no expert but every DC and SC I have ever been involved with have negative grounds, and they all came with generators.



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Roger (Mi)

11-01-2004 05:09:14




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 Re: case sc polarity in reply to Camboted, 11-01-2004 04:43:51  
As mentioned before, the factory used a POSITIVE ground with most early tractors with generators. I have a '47 Case SC with its original POSITIVE ground. Even my 1961 Case 430 diesel has a factory POSITIVE ground. Though, it's easy to change to a NEGATIVE ground. Simply switch the battery cables, re-polorizing the generator, and switching the leads on the ampmeter.



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dctom

11-01-2004 10:55:38




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 05:09:14  
your SC is not original with positive ground



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Klyde

11-01-2004 09:32:42




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 05:09:14  
Your SC is WRONG! All you have to do is look in the parts book or owners manual and you will see that it is NEGATIVE ground. 430 was a ROCKISLAND unit so it would be POSITIVE!



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JerryW

11-01-2004 05:49:18




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 05:09:14  
The determining factor in ground orientation is the regulator or cutout - everything else can run either way. There is no easy way to change the cut-out from neg to pos or vice versa. Almost always if you hook them up to the wrong ground you will burn them.

Jerry



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Roger (Mi)

11-01-2004 06:33:04




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 Re: Polarizing a generator in reply to JerryW, 11-01-2004 05:49:18  
Jerry is correct about wrong polarity. Using the wrong polority can damage the generator and will likely burn out the cutout or relay contacts. The generator must have the correct polarity in respect to the battery. Making sure the polarity is correct depends on whether you have an "A" circuit or "B" circuit generator. In the "A" circuit generator, the field is grounded internally. It's polarized by momentarily connecting a jumper wire from the BAT terminal to the GEN terminal. The molecules are then aligned for proper charging. The "B" circuit generators are grounded externally. You must disconnect the field wire from the regulator and momentarily connect it to the BAT terminal. The resulting surge of current will correctly align molecules to allow proper charging.

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clay zimmerman

03-23-2006 18:14:49




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 Re: Polarizing a generator in reply to Roger (Mi), 11-01-2004 06:33:04  
Hello, Im having this same problem. How ddo I determine if I have an (A) or (B) type generator. My tractor430-440 SN# starts with 83 it's running on positive ground now but came on negative. generator was just rebuilt and a new regulator. Generator has an armature and field wire on it. Both seem to be grounded when I run a test light from the hot (negative) battery post. I have the batt wire running from the regulator straight to the hot side of the battery since I don't have an amp gauge. Still no charging. Can't get it charge for nothing. Please help clay

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kirk wannemacher

11-01-2004 05:25:34




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 Re: case sc polarity in reply to Roger (Mi), 11-01-2004 05:09:14  
Thanks for the info. Now, I have one more question. I just recently bought this tractor and the air cleaner was never hooked up to the carburator. When I popped the bottom of the cleaner off, it is full of a thick but clear oil. Is this supposed to be in thier or how could it get in thier if it's not supposed to be. Thanks



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Roger (Mi)

11-01-2004 05:52:37




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 Re: Oil bath air cleaners in reply to kirk wannemacher, 11-01-2004 05:25:34  
Yes, oil belongs there. It's called an "oil bath air cleaner". That's before paper element air cleaners. Air enters the top of the oil bath air cleaner, passed (bubbles) through the oil, and then goes to the motor. Eventually, the bottom of the oil bath air cleaner accumulates dirt and the bottom needs to be cleaned and refilled with oil again. In very dusty conditions, it needs to be done almost daily. It's no wonder paper elements are more desired.

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Paul f

11-01-2004 05:41:07




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 Re: case sc polarity in reply to kirk wannemacher, 11-01-2004 05:25:34  
Oil bath air cleaners were widely (almost exclusively) before paper elements. Both cars trucks and tractor of the 30-early 50s used them. The oil in them should be changed at least every time you change engine oil...more frequently if you use the tractor in dusty conditions.

Air flow over the oil draws it up into the steel mesh (some looks like horse hair)where it sticks to the mesh collecting the dirt as it flies by. Gravity takes over when engine is off and dirt and oil flow back to the cup on the bottom. Dirt settles out and process starts over. Stir up the oil in yours I'll bet there is gunk at the bottom.

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kirkwannemacher

11-01-2004 05:47:11




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 Re: case sc polarity in reply to Paul f, 11-01-2004 05:41:07  
Thanks, As you can tell I'm new at this tractor stuff. How much oil do I put in it and do i just put it in the bowl. Also what kind of oil. The same as the tractor gets. If so what kind of oil should I put in the tractor when I change it. your help is greatlly appreciated as I don't have much knowledge on this tractor yet, although I've been doing some research. Thanks



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Paul f

11-01-2004 05:56:17




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 Oil bath in reply to kirkwannemacher, 11-01-2004 05:47:11  
Both my VAC and DC have fill level marks in the air cleaner oil reservoir (I don't have an SC but here should be some kind of mark.)
Use the same oil as the engine ( Not recommending it but most farmers saved some used engine oil for the air cleaner)...frankly oil is cheap enough to use fresh now days.

Original Case recommendations were SAE 30 above 70 degrees, 20w for (32-70) 10w (-20 to 32)
Many now use 10-30 all the time

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