/ LS SAYS A REGEN EVERY 2 HOURS IS NORMAL #21
- Nov 12, 2009
- 2021 Kubota L4060 HST
Have they checked to make sure thermostat is functioning properly? I think I heard somewhere that if these engines run too cool it will cause soot build up and excessive regeneration.LS SAYS A REGEN EVERY 2 HOURS IS NORMAL
Here's my regen history, the best I have record of it. I'm sure I missed a few early on before I recognized there was a real problem and started keeping track. I have been having excessive regens almost since the tractor was purchased.
Dealership has been great at getting the tractor in for service and trying a few things, but unfortunately the problem has not been resolved. They called me yesterday after hearing back from LS and informed me that LS’ stance is that regeneration every 2 hours is normal. If regeneration is occurring more frequently than 2 hours apart, there could be an issue.
I find that unacceptable. I use the tractor at home, it is not a business machine, but based on an 8 hour work day, what should be a normal regen cycle of around 50 hours, would give me 6+ days between regens, and LS is telling me that 4 times per day is normal!
First some qualifying information.
- Tractor is run consistently between 1800 and 2400 RPM
- Always used on road diesel filled from high turnover stations in 5 gallon cans, I fill 2 or 3 cans, 10-15 gallons at a time, so there has been a lot of fuel turnover, not the same, or old fuel being used. Tried with and without fuel additive (Power Kleen or Howes) no change. At one point LS blamed fuel quality, but refused to test the fuel in the tank to prove it.
- DPF switch left in regeneration mode, I have never inhibited regeneration.
Occasionally before a regen, the DPF regeneration indicator will blink on/off at 1 sec intervals indicating a >120% soot load, then soon after it will go through a normal regen cycle without me needing to initiate it via the DPF switch. I have not kept a detailed record of when the indicator flashes before a regen, but I have noticed it several times (and I’m sure I missed it blinking a few times too.) Normally it seems to go right into regen mode (solid light) indicating 100% soot load, not >120%, but not always.
I’ve also had a few regens complete and then within 5 minutes the tractor goes into limp mode which a restart clears. That has happened maybe 3 times or so. I don’t recall what was displayed on the instrument panel other than the red ! (Vehicle control error warning indicator.)
Another thing I have noticed more recently, this may be indicative or not; I have noticed a much more pronounced diesel odor in the exhaust than in the past. While nothing like my previous non tier IV motor which was sooty, the MT240 used to burn extremely clean with no noticeable exhaust odor, now there is a diesel exhaust smell, not horrible, but definitely noticeable. Maybe now because it has 300 hours that is to be expected. There is no visible soot or black smoke, just a diesel odor that was not there previously. I may also hear injector or valve chatter that is louder then before as well.
Additionally there were a couple regens run at the dealership during troubleshooting and maintenance which I don't have listed below.
Regen time on hour meter, all regens completed successfully after ~15 minutes:
4 (ran by dealer due to error code, day after I brought it home)
115 (Dealership replaced DPF Sensor, removed and cleaned DPF)
254 (Dealership replaced ECU and DPF sensor. Invoice notes “REGEN OCCURRING TO OFTEN WITH NO SOOT LOAD”)
259 (In Dealership for service, ran diagnostic, nothing significant noted)
I'm looking for advice on how to move forward. First I need to be able to get the dealer to move forward since LS who is paying for the warranty work says this is NORMAL OPERATION.
Next I see 2 different paths.
- DPF System has a fault
- DPF system working normally, tractor producing too much soot