Top 20 Yamaha Ef600 Generator/inverter Repair/service Manual Questions & Answers


Diesel generator set fault solutions: www.dieselgeneratortech.com

Yamaha Ef600... | 188 views | 0 helpful votes


Here is some reasons for reference:
1.After the diesel generator is stopped, the residual magnetism is often lost, because the material used for the magnetic pole of the exciter is close to the soft steel, and the residual magnetism is small. After the shutdown, when there is no current in the excitation winding, the magnetic field will disappear.
2.The magnetic pole of the diesel generator loses its magnetic properties.
3.Damage of excitation circuit components or circuit breakage, short circuit or grounding phenomena.
4.The exciter brush is not in good contact with the commutator and pressure of brush holder is insufficient.
5.Excitation winding wiring error, opposite polarity.
6.Stator winding and rotor winding of generator set open circuit.
7.Poor contact between diesel generator brush and slip ring, or insufficient brush pressure.
8.Diesel generator lead wire wiring is loose or switch contact is poor.
9.The fuse box is fused.
10.The "auto-manual-de-excitation" switch on the control panel is in the de-excitation position (automatic generator set has "auto-manual-de-excitation" switch).
11.The voltmeter is damaged.
12.Rotary rectifier module is damaged.

Yamaha... | 143 views | 0 helpful votes


Mybe the problem is the frequency.
Visit the website www.dieselgeneratortech.com to get more support.

Yamaha... | 157 views | 0 helpful votes


Start by replacing fuel. Completely drain the tank and carburetor fuel bowl. Do not use what fuel you may have, get 2 gallons of fresh fuel from gas station. If problem clears then likely water in fuel.

If still backfires with fresh fuel then likely an ignition issue. Failing ignition module or possibly a sheared flywheel key. Try reducing spark plug gap to .025" .

Yamaha... | 106 views | 0 helpful votes


There are several types of overload to consider:
A. Catastrophic: something has gone very wrong. There may be a phase to phase short or two shorts to ground. This assumes you have an ungrounded system. With luck the main circuit breaker will open without destroying itself;
B. Steady state over current: The load on the generator is greater than the rating on the circuit breaker. Time to parallel in another generatoror shed load;
C. Transient over current: Suppose you were running two generators in parallel and one failed. The remaining machine may experience an over current condition that causes the breaker to trip. You can also have transient breaker trips upon activation of a large motor e.g., fire pump or bow thruster;
D.Thermal: There is a big difference in sea water temperature as you travel the world. It is possible to have an overload caused by the diesel engine's inability to shed heat in the tropics. Continued operation could damage the diesel engine. Again, parallel in another generator or shed load.

Yamaha... | 242 views | 0 helpful votes


Is it overloaded? That's the most common reason!

Yamaha... | 524 views | 0 helpful votes


More supports, please see at www.dieselgeneratortech.com

Yamaha... | 204 views | 0 helpful votes


Hi, maybe you can contact your supplier who supplies the generator to you.

If you want to have diesel generator set in future, please visit at https://starlightgenerator.en.made-in-china.com

Yamaha... | 158 views | 0 helpful votes


The generator does not operate in accordance with the specified technical conditions, such as too high stator voltage, iron loss increases; if the load current is too large, the copper loss of the stator winding increases; if the frequency is too low, the cooling fan speed becomes slow, affecting the heat dissipation of generator; the power factor is too low, so that the rotor excitation current increases, resulting in the rotor heating. Check whether the indication of monitoring instrument is normal. If it is abnormal, necessary adjustment and treatment must be carried out to operate the generator in accordance with the specified technical conditions.


Diesel generator set more supports: www.dieselgeneratortech.com

Yamaha... | 419 views | 0 helpful votes


Probably find that the carburetor jets are a bit clogged. Remove and soak in carburetor cleaner and then blow out with compressed air. Or alternately get a very fine drill set and clean, but be careful if choosing this method. Also clean the air filter. cheers

Yamaha... | 1,529 views | 0 helpful votes


voltage regulator not producing volts for the exciter windings of the alternator

Yamaha... | 403 views | 0 helpful votes


Check oil level and cooling air flow past the cylinder. Are there foreign material like leaves in the air intake?

Yamaha... | 64 views | 0 helpful votes


Check the brush holder for worn brushes. If they seem ok then the voltage regulator has failed.

Yamaha... | 511 views | 0 helpful votes


Since most generators are seldom used, gas left in the carburetor gunks up and stops up the passages.
Take lots of pix of the assembly. Pull the carb, remove the bowl and spray carb cleaner in all the holes you see. Don't let it back spray into your eyes. Wear safety glasses. Some holes/orifices may need to have a soft wire passed thru them.
Next time you store your generator, drain the gas, run the generator til all the gas is out of the carb. If you can get to the bowl w/o removing the carb, pull the bowl and spray the bowl and underside of the carb w/carb cleaner and reassemble.

Yamaha... | 196 views | 1 helpful votes


10W-30 will be OK.
Try not to overfill it.
I use synthetic in all my small engines.

Yamaha... | 62 views | 0 helpful votes

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