Kubota generator shuts off after cranking

[Jordandaly27]

Hey everyone,
I'm working on a Kubota v3600 t generator that shuts down right after it is done cranking. I really think it's something electrical because when I looked inside of the control box one of the fuses was replaced by a bolt. So far I have replaced all of the relays and the only thing left is the actual controlling computer. The generator is by Armstrong power supplies and it is generating power any help would be much appreciated

 

[rentthis]

Could it be that the generator and it's linkage is shutting the engine down or do you suspect the engine being the problem? If you can disconnect that linkage and the engine continues to run, then the generator engine control would be suspect. That bolt is certainly a concern.

 

[Jim L.]

With computer control it is possible that there is a speed sensor. If there is a successful crank, then the engine and generator will be rotating at speed. If the speed signal is not happening, then the computer assumes a problem and shuts it down.

I would check on that.

 

[SidecarFlip]

I bet there is a Hall Effect sensor on the crankshaft (or camshaft) that senses rotation. If the sensor (which is usually accessable from the outside is bad,the computer won't know if the engine is running and will shut it down. The initial start sequence usually overrides that sensor but then reverts back to it to determine if the engine is, indeed running.

 

[North Idaho Wolfman]

Most likely bad shut down solenoid, should be a dual coil solenoid and the hold coil is bad.

Their is 2 feeds to the solenoid, one feed pulls the coil in on crank, and then the second coil holds it in to run.

 

[thepumpguysc]

The engine will shut down if several parameters are not met..
OR & its probably "IT".. is> the shut off solenoid is bad..
IF your in a bind & U HAVE TO run it.. lose of power & your freezing to death??
Just remove the solenoid & run it..
Is your sol. 2 or 3 wire??
IF its 2 wire that's easy.. 12v to one & - to the other..
IF its a 3 wire sol. Black wire is -..White wire is PULL & Red wire is HOLD..

 

[G.rid]

Maybe I'm thinking too simple but....
We had a zoom boom at work that would start but immediately shut down. 3 other people tried to figure it out. Long story short, even though the dipstick said there was enough oil, because they had it parked on a slight incline, the sensor wasn't reading enough. Added half a liter and it fired up and purred like a diesel!
I've also had gas generators that the oil sensor went bad, unplug it and away they go.

Just throwing it out there.

 

[GeoHorn]

I'm not familiar with this particular model generator, but I'll relate an issue I had with my own portable last year:

I noticed on occasion that it would "stumble" momentarily as if its governor wanted to slow it down for a moment, but then it'd immediately recover. I began to suspect maybe water in the carb bowl so I drained it.
But subsequent days it would do it occasionally...until one day it started but shut down only a few seconds later. It was intermittent and I was having a fit over trying to duplicate it.
Then it hit me like a ton of bricks: THE LOW OIL SENSOR! Yes, it had oil. The problem was the SENSOR itself was failing. Rather than split the crankcase open and tear into it... I simply cut the wire leading from the crankcase to the ignition system and have never had the problem again. (I check and change the oil regularly anyway.... don't need no oil sensor!)