Maintenance help on my 803a

[Blackbear]

Need maintenance help off my MEP-803A
After an oil change I started it back up, and electrically other masters with would no longer work to shut gen off, also the emergency e stop
Did not work, only after I moved the dry crank switch to off and waited about 15 mins it shut off on its own,?.
Advice on some kind of short not knowing where, I reset breaker and checked fuses inside panel but the same thing is happening
Can it turn it off.
Thanks.

 

[combustor]

How's your fuel solenoid looking?

 

[Guyfang]

I am old and slow. I am having difficulty understanding what you wrote. Are you writing on a phone? Need a bit more info.

Have you downloaded the TM's?
Is this set new to you?
Have you ever seen it run right?
Was an oil change the ONLY thing you did to it?

 

[Blackbear]

How's your fuel solenoid looking?

Great question, I tore the rubber boot a bit but otherwise ok, I may have bumped it changing oil.
Is there a relation to the fuel pu mp

 

[Guyfang]

Great question, I tore the rubber boot a bit but otherwise ok, I may have bumped it changing oil.
Is there a relation to the fuel pu mp

Yes there is. I would call it a direct connection.

 

[Blackbear]

I am old and slow. I am having difficulty understanding what you wrote. Are you writing on a phone? Need a bit more info.

Have you downloaded the TM's?
Is this set new to you?
Have you ever seen it run right?
Was an oil change the ONLY thing you did to it?

The gen will not shut off using master switch or e stop.

 

[Blackbear]

The gen will not shut off using master switch or e stop.

Been using it years, oil change all I did, don’t think it’s related, runs smooth.

 

[Guyfang]

No. Its not the oil change. Did you tighten up anything on the Fuel solenoid? Is the plug on tight? Wires in the plug right? Will the set start right? When you start AND stop, will the fuel solenoid move in both directions?

 

[Blackbear]

Yes there is. I would call it a direct connection.

I have a parts unit so I will Swap it out tomorrow.

 

[Guyfang]

Test first.

 

[Blackbear]

No. Its not the oil change. Did you tighten up anything on the Fuel solenoid? Is the plug on tight? Wires in the plug right? Will the set start right? When you start AND stop, will the fuel solenoid move in both directions?

I may have tightened the black knob on the solenoid, it does now move find in both directions. Also engine starts fine, the problem is it does not shut off

 

[Guyfang]

And when you turn the S1 to the off position, the solenoid retracts? Or doesn't move at all?

 

[Blackbear]

Moving the master switch to off I do not see it retracting

 

[Blackbear]

Moving the master switch to off I do not see it retracting

I want to try to start it again but concerned I will not be able to shut down, in that case can I move by hand the solinoidvhandle and push it in to shut it down, if it’s not moving?

 

[Guyfang]

Not if the solenoid is not turning off. Try one more time, and pull the solenoid plug out. Will it stop?
Oh, the black knob should move freely back and forth in the solenoid arm.

 

[Blackbear]

Not if the solenoid is not turning off. Try one more time, and pull the solenoid plug out. Will it stop?
Oh, the black knob should move freely back and forth in the solenoid arm.

Thanks very much. I will start and unplug if needed in the morning.

 

[Ray70]

Think of it this way... if the fuel solenoid is attached and working correctly you have to have power to it for the machine to run.
Power pulls the solenoid in and pulls the linkage towards the control panel.
To shut the gen off the power to the solenoid is cut which kills the magnetic force pulling in on the solenoid. This allows the spring inside the solenoid's plunger to force the solenoid plunger back out towards the radiator, killing the fuel coming out of the metering pumps.
If the S1 and E-stop both fail to shut it off, unplug the solenoid as Guy stated, if it still continues to run simply push the lever towards the radiator.
Then you will need to trouble shoot to see if you have a mechanical binding situation with the linkage or something in the solenoid or fuel rack binding up.

 

[GreaseMonkee63b]

What was the outcome of this issue? I have the exact same problem.

 

[combustor]

What was the outcome of this issue? I have the exact same problem.

What have you eliminated so far in your troubleshooting?

 

[GreaseMonkee63b]

For troubleshooting, I have not done much for this symptom, since I am also dealing with not producing AC. After turning off the main switch and emergency switch it will take a couple of minutes to shut off. It will slowly idle down and stumble to turn off, like it is being starved fuel.