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6 volt regulator

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w400

10-13-2005 14:33:11

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any body know what the point gap should be on a farmall H 6 volt regulator Thanks..

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w400

10-14-2005 11:50:05

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Re: 6 volt regulator in reply to w400, 10-13-2005 14:33:11

thanks for the information guys i was doing general maintenance on tractor and decided to take regulator cover of and blowout the spare cobwebs i looked at the points and wondered about adjustment but i think i will go with it an"t broke so do"nt fix repair manual thjanks for info
regards

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John T

10-13-2005 16:58:27

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Re: 6 volt regulator in reply to w400, 10-13-2005 14:33:11

W 400, I very much agree with the good advice n the good gents below. Adjusting Voltage Regulators is somethIng Im sure not smart enough to get into over the Net. Often you may be adjusting fairly critical spring tensions n air gaps etc. and with no specs you may do more harm then good. The cutout relay portion sort of between the BAT and GEN terminals isnt so critical, it basically is normally OPEN and pulls in when the Gens voltage exceeds that of the battery so it can charge it, but drops out otherwise like when the tractors off so the battery dont discharge through the Generator. The Field current control, however, is a tad more complicated and some VR's have current control while others have both voltage and current control.

Like janic pointed out and an ol buddy Gerald helped me understand, they sort of use something like pulse width modulation to control the net and effective field current which in turn determines the magnetic field strength and the Gens output. It dont know necessarily what its supposed to put out, that increases with faster RPM and/or added field current.

The first thing which may be safe to try at home lol is to NON ABRASIVELY keep the relay contacts clean n oxide free.

As Forrest Gump says "Thats all I have to say (plus about all I know) about that"

Good luck n God Bless

John T

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Bob

10-13-2005 16:42:57

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Re: 6 volt regulator in reply to w400, 10-13-2005 14:33:11

There are 2 or 3 sets of contacts in there, each likely with a gap that's pretty specific to that regulator. A guy would need the part # of the regulator to look it up.

Which are you referring to... the cutout relay contacts, or the voltage or current regulator points?

I don't know how to be P.C. about this, but usually someone without the spec sheets and knowledge and special tools needed to work on voltage regulators winds up letting the smoke out of the charging system, rather than "fixing" it!

Or, as the poster in our shop reads, "If it ain't broke, we'll fix it until it is!

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Janicholson

10-13-2005 16:17:06

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Re: 6 volt regulator in reply to w400, 10-13-2005 14:33:11

The Gap is not usually set by gauge, it is an adjustment that controls voltage through vibrating the contacts against one another "chopping" the field circuit into bits which reduce the magnetism so as to limit the voltage in the output to the battery. The current is limited by another set of contacts which do the same task (limit field circuit) to prevent the generator from producing too much current. They are unlike alternators which are self current limiting. the third contact set is a cutout relay which prevents the battery from discharging into the generator when it is stopped, or turning too slow to make the current flow into the battery. In an alternator this task is provided by the rectifying diodes when stopped (they also convert AC to DC when the alternator is operating).

All adjustments are done with fairly sophisticated instruments and controlled loads to assure the accuracy of the regulator's control.

I hope this answeres your question to a degree.
An old book from the fifties on auto repair will cover this well and either prep you for it, or scare you away.

Good luck, JimN

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KEB

10-13-2005 18:39:21

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Re: 6 volt regulator in reply to Janicholson, 10-13-2005 16:17:06

Agree. I have a late 1950's Motor's manual that has a whole section on troubleshooting and adjusting voltage regulators. Its not too hard if you have basic test equipment and understand what the adjustments change. Try your local library for an old Motors manual or something similar.

Keith

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