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Adjusting voltage regulator on a 43 CUB

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Frank R.

04-02-2004 21:54:51




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It seems that adjusting the voltage regulator on the cub is very sensitive (6.0 volt system). I am presuming that the right contact (as mounted on the tractor) is the voltage setting. I am trying to adjust this to 7.0 volts but when tightning the screw that holds it causes it to go down to 6.5 volts or up to 7.5 volts. Right now it is adjusted to about 7.2 volts and it never seems to stop charging and the battry is bubbling H2 pretty good. The real question I have is the cutout the left contact and if so, is it adjustable and is there a certain way to adjust it so the battery does not over charge. I do not have problems of the battery going dead when the tractor is off. I got into adjusting this because the battery would not charge up much and found that the right contact adjusting screw was very loose. When I adjusted the voltage up from about 6.5 to 7.2 I have a really well charged battery and starts up really quick.

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Bus Driver

04-03-2004 10:21:15




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 Re: Adjusting voltage regulator on a 43 CUB in reply to Frank R., 04-02-2004 21:54:51  
IH introduced the Cub in 1947, not before. The earliest Cubs had only a cutout- to automatically disconnect the generator from the battery when the tractor is not running. The cutout does not regulate voltage. How many coils inside the unit you are adjusting? 1, 2 or 3?



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Frank R.

04-03-2004 17:14:40




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 Re: Re: Adjusting voltage regulator on a 43 CUB in reply to Bus Driver, 04-03-2004 10:21:15  
yes, you are right I did not remember the date correctly. I will look that up again. Anyways, the regulator case has two coils in it. The right one appears to change the voltage to the battery, currently set at ~7.2 volts. The left coil has a adjustment locking screw in it but it does not appear to be adjustable.



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Bus Driver

04-04-2004 05:55:23




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 Re: Re: Re: Adjusting voltage regulator on a 43 CU in reply to Frank R., 04-03-2004 17:14:40  
The two coils is indeed a voltage regulator. I suggest investing in a new one. But the 7.2 volt output is perfect for the 6 volt battery.



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Bob

04-02-2004 22:21:26




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 Re: Adjusting voltage regulator on a 43 CUB in reply to Frank R., 04-02-2004 21:54:51  
On a voltage regulator, the unit wound with the finest wire is the voltage regulating component.

The units wound with heavy wire are the cutout and the current regulator that protects the generator from overheating from putting out excessive curent while trying to bring the battery up to voltage.

The normal charging voltage for a 6 Volt battery is 6.9 to 7.4 Volts, measured at the battery, across the terminals. If your charging system is within this range, and the battery is bubbling excessively, suspect a bad battery. Charging at 7.2 Volts should be just fine.

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