50 minute DPF regen - is this normal?

[RickyBobby]

My L3901 went into it's second regen cycle at about 35 hours. It took 50 minutes after I brought the RPM up to where it liked it.
Last regen only took about 15 minutes.
Is this normal?
If not, what could be wrong?

 

[NCL4701]

My L4701 has varied from about 10 minutes to more like 25 minutes. 50 minutes is quite long, but so long as it finished and is all happy now I wouldn’t be at all concerned.

 

[Bmyers]

I agree with NCL4701, on average mine takes around 15 minutes. I go through more regens in the winter than in the summer due to all the mowing and high RPMs.

 

[Tx Jim]

The way I understand length of time required to regen is decided by the average operating rpm's of engine & average operating temps. The lower these averages are then the longer it will require for regen due to larger accumulation of fuel soot.

 

[jimh406]

I think the question is really is it normal for how you use the tractor. If you run low RPM, you’ll have less complete burning and more soot to burn off. Idling at lower RPMs just produces more soot.

Diesels seem to use different formulas to decide if they should regen or not. I think there must be a time element in it as well as how clogged they are.

Btw, diesel trucks work the same way. If you work them hard, they don’t regen much if you idle like through traffic etc, they regen a lot.

 

[RickyBobby]

The way I understand length of time required to regen is decided by the average operating rpm's of engine & average operating temps. The lower these averages are then the longer it will require for regen due to larger accumulation of fuel soot.

This might be the answer.
When the regen light came on, I was in the process of removing the loader, so rather than shut it down, I put on the parking brake, raised the RPM and went inside for a Pepsi thinking it would be done when I came back out. It wasn't so I just let it run. If I had been working it under load, it probably would have gone a lot faster. Lesson learned.

 

[SDT]

My L3901 went into it's second regen cycle at about 35 hours. It took 50 minutes after I brought the RPM up to where it liked it.
Last regen only took about 15 minutes.
Is this normal?
If not, what could be wrong?

My M9960 regened today while I was mowing. Took less than 15 minutes and I would not have noticed had I not stopped to move a fallen branch and walked past the horizontal exhaust (drive beneath trees). It was HOT. Upon remounting, I glanced at the regen lamp and, sure enough. it was on.

SDT