How many hours between regens on your L4701

[8upbowhunter]

I will be contacting my dealer today concerning the frequent regens on my L4701 (average 5-6 hrs between them). I am starting this thread to see how long other L4701 owners are going between regens on their tractors. On the last cycle I kept the rpm's above 2200 and ran it at wot for a good part of the time but still only got 5.3 hrs before it went into regen again.

 

[jbbepic]

My L4701 regenerated around 15 hours and then around 26 or so. And I now have 53 hours.


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[8upbowhunter]

Thanks for the reply, what are the average rpm's you run it at?


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[jbbepic]

Maybe 2000 or so. Mainly had been with the backhoe but with the brush hog I just used this weekend, I think 2500 is where it's suppose to be for the pto at 540.


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[8upbowhunter]

Thanks for the update, yes 2500 is the engine speed for 540 on the pto. Still waiting to hear back from my dealer.


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[crmorse]

I have an L47 (TLB) not an L4701 but I think we have basically the same engine. I had my first regen around 25 hours and I'm up to 62 now expecting the 2nd any day now. (PM is at 97%).

From reading on here I've been careful to not idle a lot, run high rpms, and try to always do long running operations (no trash can runs with my baby) but seeing how slowly it's accumulated PM I'm not going worry about it as much now. I agree with the consensus in the other thread. Something is wrong with yours. Good luck!

 

[8upbowhunter]

Heard back from my dealer and the mechanic there said they sometimes do that in the beginning and to give it a little longer which I am not buying. Gave a call to a good friend that has several Kubotas for his business and he referred me to another dealer for service because their mechanic is top notch. He buys his tractors from my dealer because of better pricing but services them at the other dealer. I will swing by there and talk to them and see what they think before deciding which one to take it to.


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[Grizzy3901]

Before the last regent were you letting the machine idle a lot and not running high rpm? Just asking bc even when you do a regent it doesn't burn everything out a little soot is left which keeps adding up. On my 3901 I've only done 3 regens in 105 hours. I have a Mack truck at work that will plug a dpf in under 20 hours so I've had lots of dealings with regent systems.

 

[8upbowhunter]

So far it has completed 4 regens, since regen #3 through this next one (#5) which probably will be in the next hour or so I set the manual throttle at 2,000 rpm's and used the foot throttle if I needed more. The only time it went to idle during the last 9-10 hours was when I was shutting it down.


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[8upbowhunter]

Went and spoke with the service manager at this other dealership and he said that there isn't anything they could check until it threw a code for doing a regen too often which I did not know that it would code for that. He asked if I used any additives which I have not and which type fuel I was using (offroad dyed) and claims that the dyed diesel isn't always ULSD but that was changed in 2014 requiring all nonroad diesel to be ULSD (15 ppm sulfur or less) so I don't think that is the problem. Regardless I will switch to highway diesel for a while and see if anything changes. All I can do now is to continue to run it >2,000 rpm's and hope it either throws a code for the regen frequency or it corrects itself which I doubt.


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[85 Sovereign]

Sounds like you're on the right track. Just PMed you back a little bit ago. Good luck! Hope it starts running better for you!


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[8upbowhunter]

Thanks I got it and replied back to you. It runs great other than having regens every 5 hrs [emoji23][emoji23]


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[Grizzy3901]

I run my 3901 at 2400 to 2500 most of the time a little idle at start up and shut down. That's the way I've always been told to run hydrostatic equipment. I know you will burn more fuel but hopefully you won't have the headaches.

 

[8upbowhunter]

Thanks Grizz, mine is a gear drive but I will continue to run it like I stole it and see what happens.


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[Grizzy3901]

If you end up taking it in bc of all this and can be there when they pull the DPF if that thing smells like raw diesel have them check the injectors. Last Mack I had issues with had a cracked injector body which was over fueling causing the issue. I know your machine is new but weird stuff happens during machining

 

[8upbowhunter]

10-4 I will keep that in mind, thanks. I will run it for another 25 hrs and if it doesn't get better I will push to have them look at it.


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[mdhughes]

Here is the code the dealer was talking about, this is from the WSM for the 3301, 3901 and 4701:

P3024 High frequency of regeneration

 

[sheepfarmer]

Lugbolt said yesterday in another thread about tuners that the programming was different in the gear tractors than in the hst tractors. I wonder if this would result in a systematic difference in the regen intervals?

 

[8upbowhunter]

Here is the code the dealer was talking about, this is from the WSM for the 3301, 3901 and 4701:



P3024 High frequency of regeneration

Thanks, I never thought of looking in the wsm. I will look it up when I get home and read up on it.

Do you remember which section it was listed in?

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[8upbowhunter]

Lugbolt said yesterday in another thread about tuners that the programming was different in the gear tractors than in the hst tractors. I wonder if this would result in a systematic difference in the regen intervals?

Good question, mine is geared and I am not sure of the others that replied to my thread concerning regen intervals. I am still researching and documenting just in case there is an issue.


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