Generator Runs but won't rev up-shaking

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  #1  
Old 06-19-14, 03:03 PM
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Generator Runs but won't rev up-shaking

I have a UST 5500 watt generator. It's model GG5500. It has about 100 hrs on it.

My problem is that it runs but won't rev up. It shakes like crazy like something in the actual generator is binding. I had it running for a little and it started smoking in the generator part. It got really hot. No load.

I can run it and put a drill on it and it does produce power but not much due to it not reving up. The drill will barely spin.

I took the generator part off and cranked it up and it ran perfectly and revved up great so something in the generator is binding.

When it is fully assembled I can turn the bolt in the shaft that the generator is on and it spins freely. I have a volt meter and can test stuff if y'all tell me what to try. I have a lot of time so I can fiddle with this. I'd like to figure this out myself and don't want to spend much money.

Please help me. Thanks in advance.
 
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Old 06-19-14, 03:47 PM
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Welcome to the forums.

Dude.... the generator head smoking is not a good thing.
Do you have the owners manual for that unit ?
There is a very good schematic in it.

I don't know how that head is setup but in the schematic they show diodes.... especially regulator types on the field winding. Those will need to be checked. You will also need to check for resistances on the windings.

If you don't have the manual you should be able to get it at the link below.
Download UST GG5500 Series Owner's Manual
 
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Old 06-19-14, 03:52 PM
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Look for mud dauber nests as they are a real problem in Texas. One could have wiped out components when starting generator.
RR
 
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Old 06-19-14, 04:44 PM
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I'll check for mud dobber nests. Thanks.

Could the diodes or winding resistance make it shake and not rev up?
 
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Old 06-19-14, 04:59 PM
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Could the diodes or winding resistance make it shake and not rev up?
Absolutely. The generator is generating conflicting voltages.... for lack of a better description.

If it was a mechanical issue you would feel it when you spun the generator shaft.
 
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Old 06-19-14, 05:59 PM
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How do I check the winding resistance. I'm sorry, y'all are going to have to walk me through this.

The parts diagram doesn't show a diode.
 
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Old 06-19-14, 06:04 PM
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Sorry. I found the diodes. How do I test those. Again you will have to walk me through this.

So you know. I'm very handy mechanically. Just not with electrical parts.
 
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Old 06-19-14, 06:12 PM
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The diagram shows several diodes. You are going to have to open the connections to the windings to read the resistances.

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Old 06-19-14, 07:41 PM
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I will test them tomorrow and post my findings.

Thanks.
 
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Old 06-19-14, 07:53 PM
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Vibration is often caused by running on one winding.... With gen running you need to give us voltage...

After that get to the winding leads to the panel and test for continuity, and then test to ground. Let us know that and we can continue.........
 
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Old 06-22-14, 11:45 AM
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I looke closer at the windings. They are burnt and some wires are melted. I guess this thing is done for. Cost too much to fix that
 
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