Tractor is running away with itself

[Randolph63]

My kubota m108x gradually keeps reving itself up till it’s running wide open and you can’t idle down

 

[lugbolt]

check the oil for fuel contamination

 

[Yooper]

Take a look at the intake side of the turbo. Possible bad oil seal feeding oil to the cylinders.

 

[Randolph63]

Thanks I have checked both of these things
after about an hour the rpm’s start climbing slowly till it hits the max

 

[The Evil Twin]

How are you able to stop it?

 

[Tx Jim]

Do any fault codes appear on instrument panel? I'll guess common-rail electrical problem.

 

[Randolph63]

How are you able to stop it?

Turning the key off will kill it at any time

 

[Randolph63]

Do any fault codes appear on instrument panel? I'll guess common-rail electrical problem.

No fault codes

 

[Yooper]

Now I’m leaning towards an issue with the governor. Not familiar with your engine but I assume it’s a mechanical governor?

 

[Tx Jim]

Now I’m leaning towards an issue with the governor. Not familiar with your engine but I assume it’s a mechanical governor?

My guess from viewing M108X parts catalog is that engine speed(rpm's) is electronically controlled because I located no mechanical governor in PC

 

[The Evil Twin]

Hard to tell from the brief and short replies from the OP. Doesn't sound like a true run away. A run away isn't gradual. Not in my experience. Unless you call 5 seconds gradual.
If he or she was a little more engaged it may help. Video is a real easy thing these days.

 

[Randolph63]

when baling and the throttle is set after about an hour rpm starts climbing.
You can cut the throttle back but it keeps climb till the redline.
once it cools down it acts right again for a while

 

[Randolph63]

Doesn’t matter what you are doing when it warms up the rpm starts slowing climbimg

 

[Randolph63]

I have had the tractor since new

 

[Runs With Scissors]

when baling and the throttle is set after about an hour rpm starts climbing.
You can cut the throttle back but it keeps climb till the redline.
once it cools down it acts right again for a while

Is the throttle lever actually physically moving?

Could it be "vibration" making it creep up?

 

[GreensvilleJay]

re: once it cools down it acts right again for a while

Sounds more 'computer' related that mechanical. Locate whatever 'computer' boxes there are and blow ALL the dust,dirt, mud far,far away. 'Baling' is a dusty operation !
When electronic parts get warm or hot, they can change their value. That changes signal to computer, and bad things can happen.
The fact that 'when it cools down it's fine' was my clue.

 

[Yooper]

Oil getting past rings as it heats up? A compression test cold versus hot could rule this out.

 

[GrizBota]

Sure sounds like a fuel supply issue, too much as opposed to the more typical too little. If the oil level is not decreasing, it sounds like electronic gremlins.

 

[Randolph63]

Latest update the alternator Shorted out catching the tractor on fire
i got the fire put out but it burned the wiring so I’m repla one wire at a time so I won’t get confused a Kubota mechanic told me that this might have been my problem. We shall see unless I go crazy first

 

[Runs With Scissors]

Latest update the alternator Shorted out catching the tractor on fire
i got the fire put out but it burned the wiring so I’m repla one wire at a time so I won’t get confused a Kubota mechanic told me that this might have been my problem. We shall see unless I go crazy first

Wow that sucks man.

Good luck with the repair.