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I have an sdmo generating set with John Deere j88 engine1500 rpm but goes up and down on load. If set rpm at no load to 1500 if a load is applied rpm drops,if set on load and off load it overspeeds.

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6ya6ya
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Posted on Jan 02, 2017

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CarlGehrke
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SOURCE: I have an SDMO generating

Set the no load revs such that you get 51 Hz out of the generator, at 80% load this ought to give you something like 48.5 Hz with less than a 3% drop in output voltage. If not, you might have governor problems but I'd try servicing and adjusting it before replacing anything other than filters.

Cheers,
Carl

Posted on Dec 07, 2008

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CarlGehrke
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SOURCE: 10kw Generac shut down overspeed

Make sure that the throttle linkage is all there and not damaged/misadjusted, then get a manometer and check your inlet gas pressure. Gas pressure should be 8 inches of water column and stay there running or not.

Carl

Posted on Apr 06, 2009

  • 26 Answers

SOURCE: Attempted to start Generac Guardian 15 kw air

I work on these every day. Its either gonna be the rotor or stater, the voltage regulator, but most likely its a bad stepper motor which is the throttle motor, or control board. Thats all that could be causing that so its one of those. If its the rotor or stater thats bad it causes the generator to RPM up because it thinks its not producing enough power due to that. I had the same problem with the same one we just fixed and it was the slip rings on the end of the rotor so bad rotor.

Posted on Jul 09, 2009

harlan301
  • 205 Answers

SOURCE: Coleman Powermate Generator (PM0525202.03) throttle adjustment

set at 3600 rpms at 60hz

Posted on Oct 13, 2009

SOURCE: my sdmo generator keeps shutting down temperature

http://www.aa1car.com/library/overheat.htm
Troubleshooting advice above link.
Sometimes it is the head gasket, check, it can be, incorrect fuel mixture, far too lean, exhaust should be a light grey color. Check enough oil in sump. ensure free flow of air all around machine.

Posted on Mar 28, 2010

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My sdmo generator keeps shutting down temperature


http://www.aa1car.com/library/overheat.htm
Troubleshooting advice above link.
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I have an SDMO generating set with a Mitsubishi S3 L2SD engine it is supposed to run at 1500 rpm but goes up and down depending on load, if I set the rpm at no load to 1500 as soon as a load is applied the...


Set the no load revs such that you get 51 Hz out of the generator, at 80% load this ought to give you something like 48.5 Hz with less than a 3% drop in output voltage. If not, you might have governor problems but I'd try servicing and adjusting it before replacing anything other than filters.

Cheers,
Carl

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