2320 Question

[2Malamutes]

Possibly. The engine was designed for a rated power output at 3000rpm. That being said power and economy should be at that rpm which it was operationally designed to operate at. Would be hard to believe the Japanese and JD had designed the tractor to be the least efficient at its rated rpm where only its load determines the FC and where it will see the most operational hours. Running it at 3000rpm is better and will do less harm than anyone letting a diesel idle for any lenght of time. Also, PTO isn't the only function on the tractor that is designed to operate at the rated rpm. Some think that 3000 rpm is the limit of this engine but it is JD's required limit as the same engine in other applications have over 3500+rpm ratings.

I think you are reading too much into my wording. I stand by my statement that WOT is the greatest fuel consumption irrespective of fuel efficiency, which is what you seem to be referring to. I vary the RPM based on the task at hand. Under load I generally run near the rated 3000 RPM as I assume that is where the engine has the best balance of consumption and power (and thus the greatest efficiency). When not under load I don't always run at 3000 RPM, as I would rather have the lower consumption even if there is a trade-off in terms of power vs. consumption (since I'm not under load I'm not too concerned about the power portion of the equation.) There is a reason other than noise violations that you don't pull into a truck stop at night and hear dozens of diesels idling at WOT.

 

[PCABE5]

I think you are reading too much into my wording. I stand by my statement that WOT is the greatest fuel consumption irrespective of fuel efficiency, which is what you seem to be referring to. I vary the RPM based on the task at hand. Under load I generally run near the rated 3000 RPM as I assume that is where the engine has the best balance of consumption and power (and thus the greatest efficiency). When not under load I don't always run at 3000 RPM, as I would rather have the lower consumption even if there is a trade-off in terms of power vs. consumption (since I'm not under load I'm not too concerned about the power portion of the equation.) There is a reason other than noise violations that you don't pull into a truck stop at night and hear dozens of diesels idling at WOT.

I do not run WOT/rated every time I run mine either. I use WOT/rated when I need front/rear pto speed or full hydraulic capacity which is probably no different than everyone else. Transport or hauling light material I run an rpm that does not bog the motor so it will vary depending on the task. We must also remember that the percentage of load will change with rpm regardless of what you are doing and directly affect FC. I think what you, me and everyone else are alluding to is the fact there are trade-offs to how we use the tractor whether it be power or FC. Your semi correlation is misplaced as trucking/automotive applications are a much different animal than an agricultural application and would effectively be the same as comparing apples to oranges but justifying it by calling them both fruit. My idling statement above was that more damage is done by idling a diesel for a length of time than running it at WOT. I realize that this is your first diesel tractor but don稚 confuse gas engine operational knowledge to diesel engines.

 

[2Malamutes]

I realize that this is your first diesel tractor but don稚 confuse gas engine operational knowledge to diesel engines.

The two diesels in my boat tell me we won't even go there, but this seems to be the R3/R4 argument in disguise. As you said it's all about trade-offs, so we'll all have to make our own choices on this one.

 

[traprap]

Here's another perspective.

From the JD 2320 Operator's Manual describing the instrument panel:

"Hour Meter - Shows total number of accumulated running hours at rated speed. Use the hour meter as a guide when servicing various components of this machine."

That is why I usually run at rated (PTO) speed. I'm afraid if I run below rated speed that I will have quite a few hours on the machine that aren't accounted for. When my hour meter says 50 hours, I want to know that I have 50 TOTAL hours; not 50 at rated rpm PLUS 50 at below rated rpm.

As a test and when possible for the task, I'm running at slightly below rated rpm and trying to find the rpm point that the hour meter no longer calculates hours. From the little testing I've done, it seems to quit adding hours if I drop below 2000. I haven't done enough testing to know for sure, however.

Just a thought.

 

[flyngti]

As a test and when possible for the task, I'm running at slightly below rated rpm and trying to find the rpm point that the hour meter no longer calculates hours. From the little testing I've done, it seems to quit adding hours if I drop below 2000. I haven't done enough testing to know for sure, however.

Interesting. My dealer told me the meter was running any time the engine was running. I've not really paid that close of attention but my hour meter certainly APPEARS to be picking up running time under 2000 RPM. As I mentioned, the bulk of the time I am below 2000 and I just did my first service at 52 hours.

 

[thatguy]

Interesting. My dealer told me the meter was running any time the engine was running. I've not really paid that close of attention but my hour meter certainly APPEARS to be picking up running time under 2000 RPM. As I mentioned, the bulk of the time I am below 2000 and I just did my first service at 52 hours.

My understanding was that the hour meter does run at lower pms, but it just runs slower. IE - you run one hour (watch time), the hour meter may only show .8 hours of time..

Im sure someone can correct me if im wrong..

brian

 

[ChuckinNH]

It's my understanding that the hour meter on most tractors shows PTO rpm hours, and is corrected to that. So, if PTO rpm is 3000rpm, and you run at 1500rpm, you will only show .5 hours on the clock for each hour of actual time you run at that rpm.

 

[UpstateNYMarine]

As with riding a harley...Drive it like you stole it!

Just remember to wash it when you're done!

 

[Pushing_Tin]

I hadn't ever noticed whether it accumulated hours at low RPM or not. I'll check it this week and report back.

 

[Pushing_Tin]

I hadn't ever noticed whether it accumulated hours at low RPM or not. I'll check it this week and report back.