DPF issue

[Peter 315]

Keep in mind that Mahindras engines are meeting tier 4 emissions by running hotter and recirculating exhaust gases back into the intake. For engine longevity, in my opinion, regen is the way to go. Perhaps not, but time will tell.

I said that before on another thread about mahindras and was told it was false:confused3:

 

[deserteagle71]

Can't speak to the Kioti but on my Kubota, if I'm running the engine up over 1500 rpm and it needs to regenerate, a light comes on in the dash that tells me regeneration is happening - just a warning to NOT shut down the engine at this time. If I'm running the engine below about 1500 rpm and it needs to regenerate, a blinking light in the dash with an up pointing arrow reminds me to up the rpms. Once the rpm is up in the proper range the regeneration happens seamlessly - if it weren't for the light in the dash, I wouldn't know it is happening at all. There is an option mentioned in the manual for a "Parked" regeneration - meaning that if for some reason you had to postpone a regeneration, you can then get have the regeneration done by parking the tractor and hitting the "Parked regeneration" button on the dash. The ECM takes over from there and increases the rpms until the regeneration is done.

 

[xcgreene]

I said that before on another thread about mahindras and was told it was false:confused3:

Mahindra uses common rail fuel injection, which injects at a higher pressure than typcial cam driven pressure lift injectors. Along with higher pressure, Mahindras system also utilises multiple injection events to try and burn as much of the problem emmissions up during combustion. Even with this, EGRs are still necesarry in their engines, these things in turn make the enigne run hotter than if it were consuming fresh air at all time.

Heat is what burns up our problem emissions in the first place. Its also why folks running their tractors loaded up most of the time see little regen time than those of us who putter around.


So if you said that Mahindra engines utilize EGR systems and run hotter, you were correct.

 

[Turbys_1700]

New Holland Workmaster series utilize the same process as the Mahindra utilizing a DOC along with direct injection. I understand that the current EPA emissions limits allow this technology on engines uner 75 HP. Over that other systems are required in addition to DPF's and regeneration. I have had zero issues with my New Holland.

 

[DK35vince]

Keep in mind that Mahindras engines are meeting tier 4 emissions by running hotter and recirculating exhaust gases back into the intake. For engine longevity, in my opinion, regen is the way to go. Perhaps not, but time will tell.

I think International tried something similar with their MaxxForce engines with BAD results.
Like you said, Time will tell.

 

[cphilip]

Even though I do not have the regen on my 2610 I still run the RPMs when working at 2000 rpm. Higher if PTO engaged of course. Even without regen being necessary you still have to keep the engine burning up deposits and running clean.

 

[MickeyDBC]

I have 54 hours on my 7320 and have yet to see (or maybe notice) a regen cycle. The majority of the hours are at PTO speed and a pretty good load on it (discing, mowing, or seeding) with probably 15 to 20 at lower speeds and loads doing loader work or idle. Does this sound right?

 

[hillwood]

Mahindra uses common rail fuel injection, which injects at a higher pressure than typcial cam driven pressure lift injectors. Along with higher pressure, Mahindras system also utilises multiple injection events to try and burn as much of the problem emmissions up during combustion. Even with this, EGRs are still necesarry in their engines, these things in turn make the enigne run hotter than if it were consuming fresh air at all time.

Heat is what burns up our problem emissions in the first place. Its also why folks running their tractors loaded up most of the time see little regen time than those of us who putter around.


So if you said that Mahindra engines utilize EGR systems and run hotter, you were correct.

CRDI.. common rail direct injection... It's been around for almost 20 years..
Every diesel engine over 30 HP is using it today.

 

[marchanna]

Yup. 1998 Mercedes released their first CDI models.

Common rail is more efficient and can produce more power, but unfortunately most the benefit is ruined by EGR. And it’s EGR that necessitates a DPF.

The best thing you can do for your Diesel engine is delete the EGR. The higher compression and increased soot causes more fowling of the engine oil. Whereas the increased combustion temperature caused by deleting it is a non-issue for engine temps, because diesel is still far more thermally efficient than gasoline.

 

[hillwood]

When the regeneration light comes on.. I park the tractor and let it do a complete cycle...
Park the tractor.. let it idle... Start the regeneration and wait... It will rev up and do it's thing.. It will idle down when it is done..
My last one took over a half hour...
You are asking for trouble if you don't let it do a complete cycle.

 

[marchanna]

Agreed. You have to let that regen complete and don’t delay. Even if your tractor won’t do a preventative shutdown, a DPF that starts to get plugged will cause increased back pressure and result in more of that soot getting past the rings and into your oil. Then you’re going to get a seized engine.

All that aside, if you have an EGR you have to be diligent on your oil changes and use a good synthetic oil because they have better ability to hold the soot in suspension. Poor soot holding capability = engine sludge. Engine sludge = blocked oil passages.

 

[ovrszd]

When the regeneration light comes on.. I park the tractor and let it do a complete cycle...
Park the tractor.. let it idle... Start the regeneration and wait... It will rev up and do it's thing.. It will idle down when it is done..
My last one took over a half hour...
You are asking for trouble if you don't let it do a complete cycle.

Yep, try to not interrupt.

In your case, if you were doing PTO work, you'd be better off to continue that work during regen. The heat generated would benefit the regen and shorten the time it takes. The computer speeds up your engine rpm in an attempt to create that heat.

 

[marchanna]

Depending on the particular setup, the regen works by injecting raw fuel into the exhaust. Sometimes this is achieved with the injectors during the exhaust stroke, and sometimes by a separate fuel circuit directly into the DPF. The fuel then burns in the DPF element to burn out the particulate. The engine and exhaust have to be hot for this to work, but other than that, the rpm of the engine only serves to ensure enough gas flow during the regen. You need to have you engine up to temperature before you start the regen for it to work properly, but there’s no reason why you can’t continue working while it’s doing its regen; the extra fuel used when the engine is under load is of no consequence to the process.

As an additional note, if you use biodiesel or blends thereof, you will need to do more frequent regens because of the inherent increase in soot production with biodiesel. The benefit of the biodiesel, is that your fuel system will be cleaner and better lubricated.

 

[YLee Kioti]

Yep, try to not interrupt.

In your case, if you were doing PTO work, you'd be better off to continue that work during regen. The heat generated would benefit the regen and shorten the time it takes. The computer speeds up your engine rpm in an attempt to create that heat.

That's exactly what I have experienced. At around 40 hours or so the regen kicked in.
Kept on shredding and merely slowed down a hair in lo-range.
Note for us operators. it does not take long to learn our machines and how 'normal' sounds.
No one complained at how the dash is washed out and impossible to see most any indicator lights when lit.
So with that in mind, if I hear a slight change in pitch and/ or smell a change in exhaust it my que to use hand over the dash. Yup gots a red light.
So just let it cycle and keep on working.
On the Ck it came on while moving and grading dirt. So the loader was not filled up to max and just slowed down a bit and the cycle was over shortly.
New normal in life, operators that are one with machine grass-hoppah will know this.

So I have a Bosch OBDII scanner. Used it on the CK. Did not work on the CK.
So what scanners are you folks using to hook up with your machine and are you getting any results?

 

[countrybumpkin]

I used a friends that he bought from harbor freight, it wouldn’t show what the code was, but it did show a code pending and cleared it.

 

[YLee Kioti]

HF scanner amazing !

 

[hillwood]

Has anyone tried one of the smartphone dongles for ODB2... There's a lot of them out there.. Just wondering if they would work.

 

[marchanna]

Never tried one, but I assume they would be no more capable than the wired ones.

 

[countrybumpkin]

A few guys have on LS tractors and I believe Mahindra with good results.

One good thing about them is a good app is kept up to date with the ever changing protocols.

 

[finn1]

My cel light came on and power reduced at 36 hours. I restarted the engine and ran it at 2600 rpm for about fifteen minutes. It did a partial regen.

Later in the day I stopped by the dealer to discuss the event. He advised me of the proper procedure, ie warm engine, less than 5% throttle, parking brake set, press and hold regen button for a few seconds.... worked like a charm. I didn’t time it, but would estimate it took ten or at most, fifteen minutes.

The dealer told me he had one customer at 115 hours, and no regen yet. He confirmed the claim with his laptop service tool.

He also said the owners who report issues have one thing in common: they baby their tractors and idle around rather than letting it work at higher speed (and load).

I worked in Diesel R&D for 35 years. We did some projects with biodiesel several years ago, and, in multiple projects, found that b10 increases the DPF passive regeneration rates, meaning longer run time between active / forced regeneration cycles.