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I run a 2003 concord 2300 air cart - cereals no issues quite happy.

I have seeded canola with success in the past but this year cannot get it to apply correct amount. Calibrate for 5 pounds an acre - go seed and its putting down 10-15 pounds....

I changed seals - my canola roller is tight in its slot

i conclude the fan is pulling canola out of the tank somehow - i cannot figure it out how.

My fan running at 5500 rpm (putting lots of fertilizer down so i need wind) check ground no canola is cracked

completely stumped...
 

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when You say you changed seals, I assume you changed the one on the slide that runs against the roller and the "wiper" seal on the door.
 

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WOW! 5500 rpm seems way too high. I run 2800 rpm seeding canola with a 4710 concord which has 56 runs. Granted I pre-apply my fertilizer. On wheat I run 3900-4100 rpm putting down around 180lbs per acre of product(seed and fert). With that high of rpm I don't think you will be able to seal things tight enough not to get blow by. Seems when I weigh and bag canola to seed I usually put settings at least one below what bag says. So if weighing it and setting tank to 8, I end up having it at 7 for it to be around 5lbs per acre. I run a poly roller with a poly spacer ring in order to fill space between roller and side of cup. I trimmed the rubber on the flow control rod to fit the door which helped. I also installed a camera in the tank lid so I can pretty much set it exactly. I set everything and put in a couple of bags and seed until I just see the bar at the bottom of the tank and dump in a couple more. Them when bar shows up again I calculate acres per bag and tweak. After that I am pretty much dead on. Hope this helped some.
 

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I'm not familiar with that setup, but are you running single or double shoot?

If double, then you probably need restrictors in the primary seed lines. A heavy rate of fertilizer puts back pressure on the fertilizer primary lines, while 5 lb of canola creates very little restriction in the seed lines. If the tank is pressurised from the fan (looking at pictures it appears to be?), air will want to flow out the tank, through the meters to the path of least resistance, and this would be the seed lines.

The more fan RPM you use, the pressure difference becomes greater between the restricted and unrestricted lines, so the airflow and rate changes differ more

If single shoot, forget what I just said :D
 

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I run double shoot and very high rpm to carry fertlizere with out issue to the ends of the drill... Not sure if you have ware strips under your roller with that tank, but they could need replacing, other idea is a tank air damptner valve to limit air pressure to the canola tank, it always seams you need to seed half your land to figure out
 

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Make sure that 1 inch line that pressurizes the tank isn't plugged off... I have a quarter of canola that's half 10 lbs a quarter 5 lbs and a quarter 1 lb because of that
 

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I am not familiar with the concord, but on a humorous note I have a strip where I opened a field with the metering on manual instead of auto rate and applied 66#/ac for half a mile. 3 bags of seed! It's a great conversation piece as it's next to a main gravel road to town too :p
 
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