M110gx: You guys may be my last resort: Not even Kubota can fix my problems.

Recoveryhill · Jan 6, 2019

Better call Saul. I would seek legal assistance in notifying everyone concerned, dealer, Kubota both stateside and Japan of the problem and demand relief.

ericm979 · Jan 6, 2019

instyle555 said:
One more thing worth mentioning...if I allow it to try and auto regen, I bring the RPMs up to 1500, and the light will stay on (indicating regen is happening), but intermittently the light will start blinking as though the regen process has stopped, then 5 seconds later it will stay lit again. Almost like what ever the regen is doing...it is struggling with that.

People who have had problems with smaller Kubotas on their regens have often been because the DPF can't get up to temperature. If the DPF temp sensor(s) is not working correctly it would report bad values to the ECU causing it to abort or change the regen. If there's a test procedure for the sensors the dealer could try that, or just replace them. If they're covering your every 12 hour regens on their dime or warranty they should want to get it fixed to get you out of their hair.

I have seen in cars where a temp sensor reports incorrect values only in some conditions. For example a coolant sensor that worked correctly as the coolant warmed up to 150 degrees then suddenly reported nothing but 120 once the coolant temp passed 150. It can be difficult to diagnose. (in that case it was a vehicle with two temp sensors that I could query with an OBD2 reader so I could watch the bad one's behaviour).

MHarryE · Jan 7, 2019

You don’t have location info. The temperatures you quote are so low am I right in assuming they are in Celsius? My M135GX always finished its regen at 1122 degrees but that was with the 6.1 engine. You say they replaced your computer. Is yours an early build like mine on which you had to press the button to enable auto regen at every start? My computer was replaced with a new one due to my rough shifting complaint. The new computer was set to the new standard of auto regen default, press the auto button to disable auto regen. My nephew has a M110GX now at 2500 hours with no problem but he says his will vary a lot in time between regens depending how he is working it. He said under almost continual heavy load his DPF monitor keeps decreasing and will never need a regen. My M135GX varied from 13 hours to 32 hours between regens. Is your dealer unwilling to replace the DPF? It seems like it’s that time. The turbo failed on my M135GX, an extremely rare event according to my dealer mechanic. They also handle New Holland. He said they frequently need to replace NH turbos but mine was the first Kubota turbo failure they encountered. The seals that failed allowed oil into the DPF. The mechanic who replaced the turbo immediately tried a parked regen (first parked regen it ever had). When it finished at a percentage above zero, he replaced the DPF and everything was fine. I suggest asking the dealer to replace the DPF because you cannot go on that way. Yours was the first of the Kubota DPF equipped tractors. They are so far beyond the Tier4 interim they may want to ignore but to you it’s an expensive asset. They really need to support you.

instyle555 · Jan 7, 2019

Well I got Kubota Canada involved and my dealer has already spoken with them enough times that they knew who I was before I told them where I was calling from lol. So thats a good sign, but still they "we are working on it".

Frustrating problem to say the least.

Gator6x4 · Jan 7, 2019

I don’t own a re-gen tractor, but most people that have one say the re-gen process likes 2000 rpms or better. The OP, posts that he brings the RPM up to 1500. Could this be the problem.

aczlan · Jan 7, 2019

instyle555 said:
EGT sensor 2 - held a constant 735 degrees for almost a minute one time during a laptop forced regen (which was weird to see a constant temp while everything else fluctuated). The last time we watched it die (using the computer to monitor the auto regen) it stayed below 500, then in within 20 seconds in climbed very fast to 850 and shut down, that was the only time we were able to see the code appear "EGT 2 sensor over heat".

While I agree it is the sensor....why does it bounce the RPM? That was the first question the tech asked me. I am leaning towards...what ever is causing the RPM to bounce...is the problem. I could be wrong.

Did you verify the temperature? I would use something like a IR thermometer ($10 on Amazon or EBay) to verify that the temperature sensor is at least reading in the right ballpark).

Aaron Z

instyle555 · Jan 7, 2019

MHarryE said:
You don’t have location info. The temperatures you quote are so low am I right in assuming they are in Celsius? My M135GX always finished its regen at 1122 degrees but that was with the 6.1 engine. You say they replaced your computer. Is yours an early build like mine on which you had to press the button to enable auto regen at every start? My computer was replaced with a new one due to my rough shifting complaint. The new computer was set to the new standard of auto regen default, press the auto button to disable auto regen. My nephew has a M110GX now at 2500 hours with no problem but he says his will vary a lot in time between regens depending how he is working it. He said under almost continual heavy load his DPF monitor keeps decreasing and will never need a regen. My M135GX varied from 13 hours to 32 hours between regens. Is your dealer unwilling to replace the DPF? It seems like it’s that time. The turbo failed on my M135GX, an extremely rare event according to my dealer mechanic. They also handle New Holland. He said they frequently need to replace NH turbos but mine was the first Kubota turbo failure they encountered. The seals that failed allowed oil into the DPF. The mechanic who replaced the turbo immediately tried a parked regen (first parked regen it ever had). When it finished at a percentage above zero, he replaced the DPF and everything was fine. I suggest asking the dealer to replace the DPF because you cannot go on that way. Yours was the first of the Kubota DPF equipped tractors. They are so far beyond the Tier4 interim they may want to ignore but to you it’s an expensive asset. They really need to support you.

Yeah, it is an early build - I have to push the auto regen button. Thing is, the tractor does not work hard at all; the hardest it will ever work is when I am driving full-tilt-boogy down the highway. So I know temps will stay cool causing more regens.

Kubota Canada sent a test computer for him to try, and that did not help the problem. They put the machine under load and measured boost and that was still fine. So the turbo would be unlikely at this point.

The dealer does seem to be accommodating me, and I do agree they will want me out of their hair, but they rely on me coming to the every 12 hours.

instyle555 · Jan 7, 2019

Gator6x4 said:
I don’t own a re-gen tractor, but most people that have one say the re-gen process likes 2000 rpms or better. The OP, posts that he brings the RPM up to 1500. Could this be the problem.

I have tried higher RPMs also (above 2000) and it failed as well. When the computer does a parked regen it will bring the RPMs to 1500 (and bounce it) so I think 1500 should be sufficient.

RGAZ · Jan 7, 2019

Question (for everyone): Does his model have a common rail injection? If the DPF regen needs more fuel to operate in regen, could he have a bad injector? I could see a correlation between a cycling RPM and a bad injector when in regen if the computer tells the injector to stay "on" longer than normal and it sticks or leaks. Could that be a culprit? Could be more common with a common rail engine.

What do you guys think?

RGAZ