15 litre cummins - Page 2 - The Combine Forum
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post #11 of 16 (permalink) Old 05-11-2019, 10:18 PM
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Running it at 1700rpm will be fine but it wont be as forgiving if you get into a position where it does start to lug for obvious reasons.
As for the lugging power vs old Case 15L Cummins engines its probably more to do do emission systems preventing the engine from making soot from unburnt fuel by lugging than anything else.
When you lug a old tier 2 motor down that black smoke would fail any emissions test.
Our TJ500 doesnt smoke hardly at all lugging. Only when you take off full of seed and juice at a low rpm. But a T9 will roll coal just as much or more.

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post #12 of 16 (permalink) Old 05-11-2019, 11:14 PM
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I think the main thing people are forgetting to compare here is the gearing change. 1700 rpm will pull the same as 1950 in the same gear, but not when it's up a gear to run at the same ground speed.

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post #13 of 16 (permalink) Old 05-12-2019, 08:59 AM
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We pull a 60' 5710 with 7" space which is over 100 openers in the ground fairly deep in peas/lentils and a 430 bu tank behind that with 2015 versatile 450. I run it at 1610 and seems very smooth and responsive. When my son shifts me off, he "screams" it at 1710. I always hear the old "gear up and throttle down" theory but more than that for some reason those 2 RPM settings seem to be the engines smooth spot. Even sitting in neutral the engine smooths out at only certain RPMs. Hope we are not doing damage but it sure seems to work well at these RPMs. Our old naturally aspirated 800 versatile we used to run at 1500 on the 30' bourgault.
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post #14 of 16 (permalink) Old 05-12-2019, 09:40 AM
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I was told you need to run these tractors over 1800rpm to get enough lube for the trannys. I have a 500 vers and i think its the biggest pos i have ever had. No lugging power, noisy,and gross on fuel, the old n14 cummins is 100x the motor. There is a reason why the trucking industry is running from the. Also the cummins dealer/ company are a bunch of a.. holes.
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post #15 of 16 (permalink) Old 05-14-2019, 03:31 PM
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I was told you need to run these tractors over 1800rpm to get enough lube for the trannys. I have a 500 vers and i think its the biggest pos i have ever had. No lugging power, noisy,and gross on fuel, the old n14 cummins is 100x the motor. There is a reason why the trucking industry is running from the. Also the cummins dealer/ company are a bunch of a.. holes.
There are some other threads on CF about not running the TA22 below 1800 due to reduced Trans pressure and therefore flow. There are so many different design limit features built into tractors now it is hard to know if you are getting "full rack". But assuming you are from power % meter and the fact it pulls the load, there still is the fact that as rpm goes down torque load goes up to do the same amount of work. For example on my MT965B if at full peak power of 565 hp at 1650 rpm would be 1800 ft lbs of torque on the crank and internal transmission components. That is from the torque formula of hp x 5252 divided by rpm. If you drop one gear and increase rpm to 1800 the torque drops to 1650 ft lbs. Drop two gears and run 1950 rpm and torque drops to just over 1500 ft lbs. These are at 100% load and not typical for all day numbers so that is where you need to decide how much torque do you want your components running at for what % of the time. My 59' 5710 drill with 450 tank and 3000 gal nh3 pulled at 60 - 80% so I ran at 1650 in 9th gear which is at 80% load occasionally and calculates to 1439 ft lbs. Seems in range and the engine loved that speed. On a hilly 1/4 I dropped one gear and run 1800 rpm. Easier on everything.
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post #16 of 16 (permalink) Old 05-14-2019, 04:00 PM
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We have a challenger with the same PS as a versy and we pull 60 ft, 400 bu cart plus nh3 at 1400

I run 15L cumaparts in my trucks at 1200 all day long, gobs more power under 1500 rpm than there is above

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