750 or 740tt? - Page 8 - The Combine Forum
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post #71 of 80 (permalink) Old 07-29-2019, 09:24 AM
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our macdon only cuts good up to 6mph.(35’ fd70) it will cut at 6.5mph but not great.
dkd?

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post #72 of 80 (permalink) Old 07-29-2019, 09:27 AM Thread Starter
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Meskie what crops and yields you cutting at 5mph?

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post #73 of 80 (permalink) Old 07-29-2019, 09:48 AM
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For wheat I try to use much different settings… with 7mm concave you Limit your throughput much too much!
Sure it depends on the variety and if it is hard to thresh or not, but we always tend to drive the concave much more open.
So rather to to >20mm and bett ride faster to fill it. the material should grind at each other. Not each single piece at the cylinder/concave.
This also reduces the stort straw parts and prevents sieve overloading.


Open up, drive faster. Usually reduce cyclinder rpm when you open the concave and increase it when you close it (space times speed stays the same). bit 800 is already very los in my impression.
To get the stuff cleaned open up the sieves - yes open both sieves. They need to be far open that the fan gets the wind through it. We nearly ran the fan at max speed…


Special conditions require special set ups, but this why you atleast increse throughput.


First rule - go faster
Actually when I first got the Claas and I didn't know better I was having a great time just running at power limit, until I noticed that my rotor loss was a bit too high(because of the concave being out of adjustment). Anyways as I looked at that section of wheat later in the fall it was less green where I was running the machine more full. Not very scientific I know, but I suspect there was some merit to running the machine more full with those wider settings. But I have done lots of experimenting since and my most consistent method of low loss levels is to run tight concave. Running wider with a lower cylinder speed is sort of asking for a plug too, although I have never plugged anything in wheat.

Vailcat you grow wheat, soybeans and corn. Anything else?

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post #74 of 80 (permalink) Old 07-29-2019, 09:54 AM
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Meskie what crops and yields you cutting at 5mph?
Most all the ones we grow. Wheat (60-70bu) canola(40-50) barley(80-100) oats(100-150) we tried a 40’ last year and were doing the same acres/hour just going a bit slower. All my JD friends never get above 4.5 on the good part of the day running the same header. We can run a couple hours more in a day still being productive. Lots of times the combine driver doesn’t even realize it’s as tough as it is when we quit for the night. Your hand has water on it when you feel the straw.

Don..it’s just a single knife on it.
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post #75 of 80 (permalink) Old 07-29-2019, 09:56 AM
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Ah, there goes my idea.
I run 40’ Crary knife complete system 750/1500 strokes.

Last edited by Don Boles; 07-29-2019 at 09:58 AM.
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post #76 of 80 (permalink) Old 07-29-2019, 10:22 AM
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The double knife runs faster which allows you to travel a faster ground speed and still cut properly. Opening the concave up and travelling faster is good but if you have very hard to thresh wheat or kernels that have been baked into the head you will have to grind them out.
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post #77 of 80 (permalink) Old 07-29-2019, 10:30 AM
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Double knife drive makes a huge difference on the macdon headers. Our 40 ft headers were cutting much better than a single knife 35 ft last fall in tough sadash wheat.
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post #78 of 80 (permalink) Old 07-29-2019, 10:46 AM
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Our macdon only cuts good up to 6mph.(35’ fd70) It will cut at 6.5mph but not great. So going faster can be tricky.

Generally losses will hold us around 5-5.5mph mostly from rotor. We don’t have the high speed ones.
6 mph that is already fast in my world - to be honest very fast.
In good wheat we maybe go 3.5-4.5 mph. That is what I consider fast already


In tough conditions we sometimes go down to 2.5 mph
8-10t/ha with 40ft header and you get enough material between cylinder and concave.
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post #79 of 80 (permalink) Old 07-29-2019, 11:16 AM
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6 mph that is already fast in my world - to be honest very fast.
In tough conditions we sometimes go down to 2.5 mph
8-10t/ha with 40ft header and you get enough material between cylinder and concave.
Ah, that’s what 790 hp is for!

My fearless prediction Arcus?
The wheat 1/2 outside my door will average 7-8 t/ha. A record for this area. By far.
And we always seem to have higher mog ratios too.

Last edited by Don Boles; 07-29-2019 at 11:38 AM. Reason: Sp
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post #80 of 80 (permalink) Old 07-29-2019, 02:34 PM
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6 is definitely fast when you have been doing 4 all day!

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