MX 4700 idles fine, Smokes and clatters under load

[ldozier]

My Mx 4700 idles fine but stared clattering and smoking under load. I havechanged the fuel filter and changed the fuel

 

[85Hokie]

My Mx 4700 idles fine but stared clattering and smoking under load. I havechanged the fuel filter and changed the fuel

Hours on machine?

Take video and upload ?

 

[JasonW]

What color smoke? Checked the air filter?

 

[JP_Austin]

How many hours are on it? Can't recall but believe this one has a DPF. Under load if the DPF is needing to be cleaned out it can cause all sorts of odd behavior. I'd check easy things like above (filters) but may be worth looking into hours run vs. what Kubota considers as max life and service time.

 

[ldozier]

Hours on machine?

Take video and upload ?

It has 1950 hours. this morning it warmed up and the clattering quit. I used it about an hour harrowing with a few intermittent bouts of lighl clattering and white smoke. This afternoon heavy blue white smoke.

 

[North Idaho Wolfman]

It has 1950 hours. this morning it warmed up and the clattering quit. I used it about an hour harrowing with a few intermittent bouts of lighl clattering and white smoke. This afternoon heavy blue white smoke.

It has 1950 hours. this morning it warmed up and the clattering quit. I used it about an hour harrowing with a few intermittent bouts of lighl clattering and white smoke. This afternoon heavy blue white smoke.

Sounds like you could have a injector issue.
I would not keep running it like that.
Pull the injectors and have them tested and rebuilt as needed.

 

[North Idaho Wolfman]

How many hours are on it? Can't recall but believe this one has a DPF. Under load if the DPF is needing to be cleaned out it can cause all sorts of odd behavior. I'd check easy things like above (filters) but may be worth looking into hours run vs. what Kubota considers as max life and service time.

NO emission on that model.
So NO DPF,

 

[ldozier]

What color smoke? Checked the air filter?

This after noon blue/white smoke. New fuel filter. new air filter. drained fuel tank and added new fuel. Perhaps a plugged or bad injector. Anyway to test them? How hard is it to change an injector? Can I take the fuel line loose at each injector and blow through it?

 

[Jim’sMX]

It has 1950 hours. this morning it warmed up and the clattering quit. I used it about an hour harrowing with a few intermittent bouts of lighl clattering and white smoke. This afternoon heavy blue white smoke.

My experience with diesel engines is white smoke is a badly clogged air filter.

 

[ldozier]

Sounds like you have a injector issue.
I would not keep running it like that.
Pull the injectors and have them tested and rebuilt as needed.

Why would an injector go bad at 2000 hours?

 

[North Idaho Wolfman]

Why would an injector go bad at 2000 hours?

Why does any part go bad??

This after noon blue/white smoke. New fuel filter. new air filter. drained fuel tank and added new fuel. Perhaps a plugged or bad injector. Anyway to test them? How hard is it to change an injector? Can I take the fuel line loose at each injector and blow through it?

No you can not simply blow them clean, you'll need to remove and take or send them to be professionally tested / rebuilt.

 

[North Idaho Wolfman]

If you don't have a local fuel injection shop, then my go to is Oregon Fuel Injection.

You also could have other issues that could be causing it, like a bad fuel injection pump.
But start with the cheapest, easiest and most likely failure point and go from there.

You're next step after having the injectors tested would be to do a fountain test on the injection pump and then on to test compression.

 

[Henro]

If you don't have a local fuel injection shop, then my go to is Oregon Fuel Injection.

You also could have other issues that could be causing it, like a bad fuel injection pump.
But start with the cheapest, easiest and most likely failure point and go from there.

You're next step after having the injectors tested would be to do a fountain test on the injection pump and then on to test compression.

He is inAustralia……hopefully he can find someone local…

 

[North Idaho Wolfman]

He is inAustralia……hopefully he can find someone local…

????? Where did you come up with that?
He's in Dolores, Colorado

 

[85Hokie]

He is inAustralia……hopefully he can find someone local…

I think he is IN Colorado !

 

[Henro]

????? Where did you come up with that?
He's in Dolores, Colorado

You got me there! Somehow, I clicked on a post that I thought you were replying to, and the location of the poster was Australia.

I remember the language written in the post I clicked on was just a little different than we commonly seem to use here in the states, that’s why I was curious.

Actually, I think I remember that thread as being about a L185 perhaps?

I’m as puzzled as you are!

 

[ldozier]

This after noon blue/white smoke. New fuel filter. new air filter. drained fuel tank and added new fuel. Perhaps a plugged or bad injector. Anyway to test them? How hard is it to change an injector? Can I take the fuel line loose at each injector and blow through it?

If you don't have a local fuel injection shop, then my go to is Oregon Fuel Injection.

You also could have other issues that could be causing it, like a bad fuel injection pump.
But start with the cheapest, easiest and most likely failure point and go from there.

You're next step after having the injectors tested would be to do a fountain test on the injection pump and then on to test compression.

Well it was the weekeend and nobody was available to look at my tractor. I needed it Tuesday. I put 16 oz of Lucas deisel injector cleaner in 4 gallons of deisel and let it set at fast idle for 2-3 hours. Better but still some smoke at light load. I put 16 oz of Hotshots in 4 gallons of deisel and let it idle for a couple of hours then harrowed a five acre pasture. 5 more gallons of deisel and 8 oz of hotshot. It is running fine. I worked hard for about 30 minutes today before I got rained out. That was the cheapest, fastest, easiest thing I could think of. i had done the same thing on my dodge gas powered pickup a few years and it still going fine.

 

[North Idaho Wolfman]

Well it was the weekeend and nobody was availabl to look at my tractor. i needed it Tuesday. I put 16 oz of Lucas deisel injectotor cleaner in 4 gallons of deisel and let it set at fast idle for 2-3 hours. Better but still some smoke at light load. I put 16 oz of Hotshots in 4 gallons of deisel and let it idle foe a couple of hours then harrowed a five acre pasture. 5 more gallons of deisel and 8 oz of hotshot. It is running fine. I worked hard for about 30 minutes today before I got rained out. That was the cheapest, fastest, easiest thing I could think off.

Glad you got it running, but order and install new Injectors!