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1963 ONAN SPEC#705JB 3R/1G GEN DATA #705 JB3N1B HAVING PROBLEM WITH VOLTAGE OUTPUT UNDER LOAD ONLY.200 VOLTS ONE PHASE 40 VOLTS ON THE OTHER.FOUR LEAD GEN 120/240 VOLTS.ANY THOUTS,BRUSHES LOOK FINE.

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First remove any loads, is the voltage still unbalanced? If not check the grounding of the load, if yes check generator N/G leads are tight. Check the stator windings to make sure they are in tolerance for L1 L2. If you need help let me know. This unit probably has a reactor, so check for any loose connections. Also check the diodes, you may have to lift one end out of circuit to test properly, or else your meter will not read correctly

Posted on Nov 18, 2013

4 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: Powermate PM0496500.02 No voltage output

Here is a simple test to check field and other wiring. With engine off apply 12v ac 1 amp to 110v outlet plug on generator. This will energize the field windings and should cause the armature to produce dc voltage at the brushes and produce a nice magnet. If there is a short in the field or broken wire or shorted capacitor there will be no dc reading at the brushes. . This test is the opposite of what actually occurs when the engine is running. That is the armature produces a magnet fed thru the windings, regulator and brushes. If dc voltage is present at the burshes, remove 12v ac and start engine to check for output. enjoy

Posted on Dec 01, 2008

Tunneler
  • 27 Answers

SOURCE: My yamaha 2400 gen.does not run smooth at idle,

I'm not quite sure if your issue may relate to most inverter and auto-load sensing generators or some gas-powered equipment.
Most power cutters/grinders such as Stihl or Husqvarna, specially the higher cc models do sound crappy without load, you'd think there's something wrong with it from day 1. This is normal. Well, some of these machines lack the load sensing capability thus does not adjust throttle variably according to load.
Modern generators, specially the inverter ones along the 1000 to 3000 watt range where the Yamaha 2400 falls into category, have a switch where you can choose to let the unit sense and adjust throttle according to load. If this is off, the unit might sound like its not running smoothly on idle. Depending on you, this can be alarming or not. On a Honda EU2000is, for example, it is noticeable when the auto-load sensing button is off but not be like its choking or sputtering.
Anyhow if it is idling roughly, I can only come up with 2 possible causes, if I may suggest:
1.) the cable that gradually pulls the throttle (to open wide or close) on the carburetor - normally called governor cable (although it has different configurations on different engine types) needs to be adjusted/tightened. Or replaced, if worn out. Before new cable, put lithium grease on cable - it helps a lot.
2.) throttle adjustment might be necessary. At most Yamaha servicing dealers, it is included when you have a carburetor tune-up. They will check the diaphragm for blockage or holes, gaskets for leaks and filters, well, the entire integrity of your carburetor. This resolves most rough idling issues.
I know it would probably save you at least $65.00 if you have to check this yourself and buy the spare parts. However, going to a servicing dealer may be the best solution but always be sure the repairs are warratied. Hope this helps.

Posted on Aug 16, 2009

Testimonial: "Thank you...I will check all that you mentioned."

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SOURCE: Gen starts and runs with rocker start button pushed in..stops....

Cleaning the brushes is used to address an AC output problem. If the generator would run for a few seconds after letting go of the button, then this might apply.

But, since yours is dying as soon as you let go of the button, that tells me that you are probably looking at a low oil condition, or a sensor / sending unit failure for oil level.

Without spec number, hard to remember if the sending unit is for low oil pressure, or low oil level. Either way, the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

Posted on Aug 25, 2009

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Please stop making new problem threads each time you answer, instead post a comment to one of the 5 threads you already have open for this problem. It's getting hard to follow the conversation :-)

OK, now to the problem. You say you have checked 67 volts is displayed on the generator output, I think this means that you see 67 volts on the control panel display when the generator is running. This can be several different problems:
a) a bad CT/PT module that tells the controller the wrong voltage
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Get a real DMM meter and measure the voltages at the top side of the output (large) circuit breaker of the generator. Put the black lead of the meter on the neutral wire and then measure to each of the phase wires on the circuit breaker. If you get normal voltages then you probably have a bad A/D, if you get 67 volts on all 3 phases you have some other problem.

You still haven't told me what model/spec of generator this is, look on the data sticker on the generator cabinet.

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