Go BottomSelecting the best engine RPM Kubota L2600F
 | B55Baron
Join Date: Apr 2004 Posts: 5 Florida 
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2004-04-19 83650
How does one determine an appropriate engine RPM for a given task?
Say I'm mowing or pulling a box blade on flat terrain. Do I use the throttle to select a particular RPM and then use the tranny to get the desired over-the-ground speed?
My tractor's engine seems to run happily at practically any RPM and under practically any load. But I'm concerned about "lugging" the engine or revving it too much.
My initial inclination is to run it at 2000 RPM all the time (ignore the PTO for now). The manual doesn't discuss this subject.
(The power v. rpm curve for the diesel engine that drives my irrigation pump actually has a pretty pronounced peak, making me think that perhaps the engine in my tractor doesn't have a power band that's as wide as I think it does. Again, the manual isn't any help as it provides no power or fuel-consumption curves.)
Side question: The foot throttle seems to makes most sense for driving the tractor from point to point, like a car, rather than for doing work with an attachment. Correct?
If these questions are better posted elsewhere, feel free to send me there.
Thanks.
--Mike
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 | beagle
Join Date: Jan 2004 Posts: 1333 Michigan 
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2004-04-19 83681
Mike, go to the Kubotaengine website. They have all the performance curves on the site. Check your manual for the engine model and you can find the curve. I have always lived by the torque curve. I try to run at peak torque for most tasks except when mowing or operating pto equipment that requires higher rpm's to run properly. Operating in the peak torque range is best for the engine, especially when grading and other heavy haul work. ....
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| B55Baron
Join Date: Apr 2004 Posts: 5 Florida
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2004-04-20 83706
Great; thanks. I didn't know about that site. --Mike ....
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| muletrain
Join Date: Apr 2004 Posts: 25 Deer Creek, north of Oklahoma City
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2004-04-20 83707
Beagle, thanks for this site reference. As a new owner of the L5030 I could not find any reference in the owner's manual for operating RPM either. The Kubotaengine.com site's engine models do not match with the Kubota L5030HSTC webb site description of the model. I will have to dig out the manual at home. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada 
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2004-04-20 83708
Generally speaking, for normal work we run the GST's at about 1800 rpm and the HST's at about 2000 rpm.
We adjust rev's for work load using those numbers as a starting point. Some tasks require slower speeds for example, so the deeper gearing allows for lower rpm's but when speed is required, towing a loaded dump trailer for example, then a few more rev's are needed.
Best of luck. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2004-04-21 83788
Two thousand sounds pretty good for most engines. For scraper work, I select a gear that will carry the max loads I expect without lugging the engine. I then set the hand throttle for a slow as I want to go and use the foot throttle to increase ground speed. I increase the rpm if the engine lugs and then maybe have to find another gear for the speed I want. Sometimes I need to slow down in a hurry and it's good it happens just by taking my foot off the throttle.
I think most newer small diesels have broad power curves. Old ones were almost constant rpm engines. The max torque points can be at rpm's higher than pto rpm and HP also may increase above the pto point. Nothing wrong with running them at lower rpm's far as I know as long as they aren't lugging and the load is enough to get the temp up into the normal range.
Diesels do like to work though. If they're chugged around to yard too much at low rpm they gum up and start puffing gray smoke. The oil life also is shortened. If that happens, a stint of hard labour usually straightens them out. ....
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| B55Baron
Join Date: Apr 2004 Posts: 5 Florida
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2004-04-21 83835
I checked the Owner's Manual -- it doesn't say what particular engine powers my L2600F. But I found the newer L2800 has the D1430 engine.
I then checked kubotaengine.com and found that the D1430 is rated at 29.0 hp at 2800 rpm, while the "generator standby power" (whatever that is) is 18.1 hp at 1800 rpm.
So . . . I'm ready to conclude that the engine of my L2600 is probably happiest (power v. longevity) somewhere in between, at say 2300 rpm.
I'm going to use 2300 rpm as the base rpm when the tractor is working, i.e., pulling an attachment.
Comments welcome.
--Mike
P.S. You'd think Kubota would make such information more readily available to the owners of its products. ....
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| B55Baron
Join Date: Apr 2004 Posts: 5 Florida
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2004-04-21 83839
I didn't dig deeply enough at kubotaengine.com...
A link took me to a graph of hp and torque vs. rpm.
Hp increases essentially linearly between 1400 and 2800 rpm.
But torque is quite flat between those two rpm. It's highest at about 1800 rpm, but by only a wee bit.
2300 rpm still seems about right for heavy work, but lower rpms should be fine much of the time. --Mike ....
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