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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14896
Experience:  Certified on Onan and Generac generators
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I have a model number 57340 15kw generator generac brand and

Customer Question

I have a model number 57340 15kw generator generac brand and it's having a issue.
When I crank it it will run 20-30 min then go to a high idle and shut down after that it will crank and die. I checked the relay and seems to be working correct and thinking it's the gov control board are there any steps in checking this befor I spend that much money on it?
Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

What is the serial number of the genset?

Customer: replied 1 year ago.
Expert:  Hank F. replied 1 year ago.

If the unit is running for 20 - 30 minutes, then the problem is not going to be the governor control board.

This sounds more like the genset is starving for fuel.

Remoce the air filter.

Start the unit and let it run until it shuts down.

When it does shut down, immediately try to restart it while spraying in some carb cleaner (do not use starting fluid).

If you can get the engine running on carb cleaner, you have a fuel delivery issue, such as a clogged air vent in the gas cap, plugged fuel filter, dirty/collapsed fuel line, or a bad carburetor.

Customer: replied 1 year ago.
No it is killing the coil it's sending a ground to the coil if I disconect the kill wire going to the coil it will run but it's at high rpms it's like something is getting hot and sending the ground to kill the engine it is not a fuel issue
Expert:  Hank F. replied 1 year ago.

Connect a voltmeter and a frequency meter to the unit, and start it up. Make sure there is no load on the genset.

Monitor the voltage and frequency.

Also check to see if the red LED is on at the Engine Control Board.

What voltage and frequency do you get while it is running?

When it speeds up?

Is the LED on or off?

If on, does it stay on until the genset shuts down?