Posted by Bob M on July 10, 2009 at 07:11:57 from (74.74.133.11):
In Reply to: Adjust/repair V/R? posted by GordoSD on July 10, 2009 at 06:06:04:
Gordo -
The relay with its contacts held open by a spring is the cutout relay. Its purpose is to keep the battery from discharging through the generator when the engine is stopped. The cutout senses generator output and closes to connect the generator to the battery when the generator voltage exceeds the cutout's setting.
The other relay is the actual voltage regulator. It senses system voltage - its contacts open when battery voltage reaches the VR's setting (about 7.2 volts for a 6 volt system; about 14.4 for 12 volts). When open the VR's relay contacts interrupt current in the field circuit by inserting resistance into the circuit. This in turn causes generator voltage to drop.
When the VR relay is operating its contacts open and close very rapidly - many times a second.
----
Bench testing and adjusting a VR requires specialized instruments and a high output variable voltage power supply.
However the regultor voltage relay setting CAN be adjusted on the tractor if you have a good quality, accurate VOM or DVM and some patience.
Setting the cutout is more fussy. And if you don't get it exactly right you risk a dead battery and possibly a burned out generator.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
