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What’s the best combination of knives - paddles - vanes ,for a 40 ft spread ? I saw seedcleaners post of the deeper vanes but wonder what else was changed ? This is on a 2014 760TT.
 

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Not sure what kind of Mav chopper you have. On my 480 I do not have the tail board up all the way to spread 36'.
I just put the chopper on as it came from factory and adjust the tail board halves according to what header I have on i.e. doing swaths or straight cutting.
If I lift each side of the tail board to the highest setting it will spread over 40'.
Had the chopper for a number of years. It came with wing paddles on both outside edges. I believe there are also a few wing paddles scattered through the center section as well.
Can have a better look later if you want. Raining here now.:eek:
 

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First remove the upper fingers at the rotor exit, on the sidewall. Next, make big long deep vanes on the tailboard I recommend stainless as it is smooth and strong. I am very happy with the spreading, except for sidewinds. This is on a narrowbody, so a wide body should spread even better.
 

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On our 590 and 595 we took out one of the cutting knives out in each pair of knives for the first 8-10 rows from the end and added a side wind blade. I hard surface the face of the wind blade so they last more than 2-300 hours. We can spread wheat straw a full 40 feet. I have also spent time to adjust the vanes in the field to give a even spread.
 

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Many hours ago, I replaced the factory knives with Redekop 650? knives. They are a grade above what was factory for our 2011 MAV.

At that time, I also put a bit larger wind blade on each end of the drum. They barely fit but are bigger than factory. I am not sure if they are necessary.

The best, but also final improvement I did was the stainless fins on the tailboard. Bigger in every direction and have a smoother, larger curve to the side. I did three on each outer side of the tailboard and left the inner fins alone.

I am not sure if all all of the above changes are necessary but IMO, the fins are needed for a good 40'.
 

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Many hours ago, I replaced the factory knives with Redekop 650? knives. They are a grade above what was factory for our 2011 MAV.

At that time, I also put a bit larger wind blade on each end of the drum. They barely fit but are bigger than factory. I am not sure if they are necessary.

The best, but also final improvement I did was the stainless fins on the tailboard. Bigger in every direction and have a smoother, larger curve to the side. I did three on each outer side of the tailboard and left the inner fins alone.

I am not sure if all all of the above changes are necessary but IMO, the fins are needed for a good 40'.
I think that Redekop knife is a 650 HC The C meaning carbide. They are a little longer and heavier than the stock Claas knife. It is the stock knife in those afermarket choppers like victory has on his 480 with the split adjustable tail board. Excellent chopper. At least better than the stock 500 series chopper.
 

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Made them. They are 10 or 12 inches tall, vary in length, and I don't recall what thickness, maybe around a 1/16th" or 14 gauge.
 
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