51 hours, no regen L4701

IMO, that reflects quality fuel & proper operating rpm for task involved.

My 1yr old L3301 has 43hrs, and still not had a regen cycle.

Same tractor, I'm at 37 hours and no regen yet. Most of my time has been at PTO speeds so it may be awhile until I see a regen.

I wouldn’t worry yet. My L4060 did its first regen at 72h (then after 38, 65, 52, 35 hours).


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My MX4800 did it's first regen at 36 hours...I would say 33 of those hours were running at wide open throttle. I thought it was a bit early. Regen took about 20 minutes. Sometimes when I'm mowing I'll encounter a section of really tall or thick grass and the engine will start to bog. On my older tractors, that would result in smoke coming from the exhaust...in this case the DPF has to absorb it. Maybe that made mine earlier, I dunno. Regen was pretty seamless.

Not unusual to go that long w/o regen. All depends on the usage. Specifically the load and RPM among other things.

Junk engine oil can have an affect too, similarly fuel quality.

If no codes showing on the panel, don't worry.

I think I was around 60 hours for my first one. I wouldn't have noticed but I happened to glance down and see the yellow indicator on the dash. I just kept the rpm's up and continued to work. It was a non issue.

Yep, probably just means you are treating it right. My MX averages about every 44 hours.

My first on my L3901 was at 37 hours. I try and keep the rpm's up, and don't let it sit and idle too much.

My l3901 regened at 19 and 17 hrs so far. I don’t drive it to keep the dpf happy I use it like a normal tractor. If it regens more I assume it’s made for it. I’m not shutting it off every time I get off to do something or rev it up ASAP without letting warm up etc. I guess we will see how things go. Happy tractoring

Hi Brick. Everyone operates their tractor to try get it to last for years I hope. I just see a lot of how operate with the dpf. Max rpm, work it, minimal idling all while trying to keep the dpf gods happy. It regens when it needs to by design. If its 10 hrs. or 50hrs. I don't see the big worry. This time next year my opinon may change and if it does I'm sure I'll post a comment. I drive it like I would any piece of equipment I have which is to say it will probably get babied somewhat like u said running like I think I should. The dpf operation will get a test this winter as I do snowblow as cold as -35c depending on the snow. We will see how a regen works at that temperature. Happy Kubota ing.

Have had mine about 7 months. Started with 58 hours when I bought it. Regions every 35-50-ish hours. Usually starts at the absolute worst time, so I just drop the bush hog and mow for about 15-20minutes until it does it thing. I typically run mine at PTO speed for all tasks.

markbxr400 said:

Have had mine about 7 months. Started with 58 hours when I bought it. Regions every 35-50-ish hours. Usually starts at the absolute worst time, so I just drop the bush hog and mow for about 15-20minutes until it does it thing. I typically run mine at PTO speed for all tasks.

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"At the worst possible time", indeed! I run both a new (100 hours) L3301 tractor and Kubota U25 mini excavator, and I hugely enjoy NOT having to mess with the regens on the mini. I HATE running at a higher rpm then is actually needed to perform the work, and not being able, without guilt, of leaving it idling a bit.

How about this: if there was a black market way to turn it into a good old fashioned Kubota without all the regen crap, like my mini and my previous Kubota tractor, I'd do it in a hearbeat, and screw the warranty. It is beyond my capabilty to do it myself, or I would have by now. I should mention I am running about 30 hours between regens, but it always seems to happen when I am ready to put it away, and in a hurry, and to sit there with the engine roaring away until it's happy just fries me. I get it, this is like complaining about the beeper in my car telling me to wear my seatbelt (which I do anyway), just a fact of modern life, but I don't have to like it! The fuel burn on the 3301 is easily double my older (and smaller) B2105, running at high rpm's most of time is no doubt the cause.

markbxr400 said:

Have had mine about 7 months. Started with 58 hours when I bought it. Regions every 35-50-ish hours. Usually starts at the absolute worst time, so I just drop the bush hog and mow for about 15-20minutes until it does it thing. I typically run mine at PTO speed for all tasks.

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Yesterday, at 143.8 hrs I had my third regen on my MX4800. Could not have happened at a worse time. I was about 100' up a very steep grade, with my grapple pulling blackberry vines out to swamp in a new trail/path. It was steep enough that if I stopped I would just spin 4 wheels if I tried to go up. All of a sudden I had a squealing noise, I thought I had a blackberry vine in the engine, so I shut down, climbed down into the blackberries, opened the hood and searched for the intruding vine, could not find one. Closed up, started up and noticed the regen light on, I idled down the hill backwards, (regen and increase throttle lights on), got on the level and throttled up, it took about 15 minutes.

Of interest here, for the first 90 hours or so I kept the rpms high all the time, never idled, and shut down quick. had a regen in the mid 40s and second one..70 or 80 I think. Since then I have been treating her like I think one should, idle to warm up, low rpm for small tasks, high rpm for work, brush hogging etc. Seems to have made no difference on the time for regen.

A great tractor. and for anyone needing to clear blackberries, nothing beats a grapple.

M

Why idle all the way back down the slope? I'd just run it as usual and go.

I'm with you on running the engine normally, though. Many people get a bit paranoid about a modern diesel...nothing is going to be harmed by idling a bit, or mid-throttle, etc.

I always warm mine up...course it's 25F in the morning now, so I kind of need to. More idling will cause the engine to need to regenerate sooner, though.

captmikem said:

Yesterday, at 143.8 hrs I had my third regen on my MX4800. Could not have happened at a worse time.

Of interest here, for the first 90 hours or so I kept the rpms high all the time, never idled, and shut down quick. had a regen in the mid 40s and second one..70 or 80 I think. Since then I have been treating her like I think one should, idle to warm up, low rpm for small tasks, high rpm for work, brush hogging etc. Seems to have made no difference on the time for regen.

M

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I agree. My experience with my L3560 coming up on 4 yrs old, is that the dpf filter fills the most during the 5 minutes or so it takes the engine to warm up. The 60 series tractors have a bar graph in the panel that shows how full the filter is getting, and depending on how cold it is and if there are additives in the fuel, the dpf gains 2 to 4% in warming from a cold start. After that it gains little or decreases. I run it at an rpm appropriate to the task. Since I know a regen is coming from the graph, and I might want to get it done while I have something to do at high rpm, I might idle it to get it to kick over to 100 and start the regen. None of the diesel engines like to be lugged, so use appropriate rpm is fine as far as I am concerned. The only thing different is that there is no point in leaving these common rail engines idling when the tractor is stopped for a break. They are easy to start.

The only reason people are told to leave the rpm up all the time is the problem if someone gets off their tractor for half an hour and the tractor asks for a regen rpm and no one is paying attention. If someone is working and looks at the dash fairly frequently and checks for lights etc any suitable rpm is fine. You have roughly 30 min from the time it starts to request the regen to its completion, before it will demand a parked regen. So if you are fairly observant, no need to drop everything immediately.

I agree it can be inconvenient to have to think about it, I would like to be able to trigger it myself say any time after say 95% . While you can shut it off before it starts it is inadvisable to stop in the middle. Mine regens about 3 or 4 times a year.

Ain't this interesting if you lived in Poland.


http://www.agrotronic.pl/en/1548/Kubota_tractors__deactivation_of_EGR_and_DPF_already_possible