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Forums13
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Most Online117 Jan 16th, 2020
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#10173 - 03/21/14 01:08 AM
Re: Composite MG issuse
[Re: Tarth]
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Joined: Aug 2011
Posts: 563
uppo72
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Joined: Aug 2011
Posts: 563
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Double check Neutral first. Many motor shops use the AC way of setting neutral which is not adequate. Grab your battery and bi-directional ammeter and get it as close to 0 deflection as possible. Hey Tarth, can you explain the procedure on using this method? I never have had to go to this degree(our Westinghouse gennies are stamped for neutral plane and you can generally tell by your levelling speeds and im pretty sure the Otis ones are too) Thanks in advance U.
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#10177 - 03/21/14 03:02 AM
Re: Composite MG issuse
[Re: uppo72]
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Joined: Jan 2014
Posts: 432
Vatorgator
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Joined: Jan 2014
Posts: 432
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the dover generators that i have worked on, have the brush rigging pinned. you are not able to move the rigging to adjust neutral. I have removed the pin once to try and get a generator that would not compound properly, i thought that i could adjust the rigging like i have on many other generators that i have worked on, It did not go well. i compounded the car, and let it run, the first few runs were ok, then we picked up a full load of people, the very next stop, the car pulled thru the brake violently and headed up with the doors wide open. luckily i was in the car and kept the people from exiting. very hairy. had to put the rigging back to where it was originally pinned. ultimately i had to pull the generator for repair, as i could not get the car to compound. just thought i would pass this on, in case anyone decides to remove that pin.
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#10186 - 03/22/14 08:19 AM
Re: Composite MG issuse
[Re: NewMech]
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Joined: Aug 2011
Posts: 563
uppo72
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Joined: Aug 2011
Posts: 563
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Whenever I've had a repair or a brush changeover, I have just used a com stone/chalk over the com with the brushes in and left the lift on inspection, to let them bed in overnight or at least during the day.
Last edited by uppo72; 03/22/14 08:20 AM.
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#10240 - 03/29/14 12:52 AM
Re: Composite MG issuse
[Re: danzeitz]
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Joined: May 2011
Posts: 487
E-man
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Joined: May 2011
Posts: 487
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Excellent advice. Same idea. Ive heard to the paper all the way around the comm and tape it. Then take a pencil and stick it down in the brush holders (at the same identical spot in each holder) and make a mark. Then pull out the paper and measure between the marks, they should all be the exact same dimension from each other. May help if you label the holders like a clock, 2:00, 4:00 etc. Helpful trick, I don't know how well know this is but works great. Even with neutral set right brush holders can be set at different angles so brushes are not on proper comm segment at the right time. So take a piece of adding machine paper and wrap it around the comm. Cut it off when it overlaps in a valley between segments. Now remove paper and fold in half then half again. Now wrap back around comm and tape ends together. Now you can set the leading edge of each brush to the lines made when you folded the paper and you will have a perfectly quartered comm.
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