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Farmall & IHC Tractors Discussion Forum
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Is running at low revs OK

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Clanger

05-26-2005 03:10:54




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I've just got a replacement tractor for my 484 (Case 4230) which has two speed PTO switchable from in the cab.
The digital dash has a readout of the PTO speed and I've found that if I select the 1000rpm PTO speed I can run the engine at 1200rpm to achieve 540 revs at the PTO. This works great as I'm using the tractor for finish mowing and I do not usually need lots of PTO torque, just the correct shaft speed.
My question is that is it OK to be running a diesel at a comparatively low 1150-1200rpm? It sure does save some fuel!

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korn_fed

05-28-2005 14:43:53




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
Depends. If you ask Cummins (they have built a few diesels) they say idling is three (3) times harder on a diesel than pulling a load. What is idling? under 1400-1500 RPM? I would say 1100-1200 is very minimal.

I agree with Hugh, engine temp is #1. then i would say engine RPM, no lugging. Esp in a compression ignition engine. And the higher the load, increase RPM.

And i'm not so sure there is much fuel savings, maybe some...

Ken

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Hugh MacKay

05-27-2005 02:57:59




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
Clanger: The number one item with any diesel is keep the engine up to proper operating temperature. With light work this dual speed pto is exactly how you do that. Not only can you do as you propose, that is precisely how it should be done.

One of your respondants spoke of older diesels slobering. The new ones will do it also, maybe not quite as bad but will do it. Slobering is caused from too low operating temperature. Too low operating also causes excessive engine wear.

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captaink

05-26-2005 10:46:01




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
Older diesel engines were noted for “slobbering” if run at low RPM under light loads for extended periods of time. The “slobber” comes from unburned fuel going out the exhaust and it makes a mess on the exhaust manifold. I never noticed any other bad effects from low RPM work if there was a load on the engine so that the fuel was burned completely. I have run diesels down to 1500 RMP continuously under medium loads and have not noticed any problems. The most important thing is remember that you don’t have many RPM’s before you start lugging the engine which is not good for any engine.

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Joe Evans

05-26-2005 06:20:42




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
That will work just fine. Dad always told me that if you hit a tought spot doing something and the engine pulls down but recovers rather quickly, you're not hurting it.

It sure will save on fuel.



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mowr

05-26-2005 04:57:11




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
What you're doing sounds right to me. For fuel conservation, whenever it's practical, "throttle down and gear up" It's not practical for heavy pto jobs because you'd cause damage by 'lugging' the engine. With a single-speed pto, however, there's not much choice but to run at the engine speed that gives 540 rpm for the implement being used.



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Bob M

05-26-2005 04:41:08




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
Won’t hurt a thing! Aside from the risk of accidentally bumping the throttle and overspeeding of your PTO driven implement, running a diesel engine at those RPM’s for extended periods is fine. Rather it’ll save a bunch on fuel. Also it prolongs engine life. And makes for quieter working conditions for the driver.

Note that tractor operator manuals for current production Deere tractors (and probably mfr's too...) recommend to “gear up and throttle down” as load conditions permit, for the same reasons above.

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Dieselrider

05-26-2005 04:00:37




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 Re: Is running at low revs OK in reply to Clanger, 05-26-2005 03:10:54  
I am not an expert by any means and I do not have any documentation to back this up but, I have heard that the best way to run a diesel is wide open or close to it. A friend had one in for service one time and the old timer working on it said to him "tell those boys of yours to open the throtle and drop it down a gear". It must have had some carbon build up os something. I don't know why.



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Nat

05-26-2005 05:48:35




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 Re: Is running at low revs OK in reply to Dieselrider, 05-26-2005 04:00:37  
That's the problem with old timers sometimes. Every so often you'll run into one with some piece of wisdom based on some antiquated, long-disproved notion, or nothing at all!



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