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Bought a john deere 787 with 3rd 320 tank mounted on it. Hoping to seed canola out of the 3rd tank and also use for innoculant. The cart has the blend kit for the primary runs but there is nothing in the book about this tank. Any help greatly appreciated specifically calibration and setup.
 

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we used to have a tank just like that. worked excellent for seeding canola and grass seed. I think you can get a manual for that tank that would give the settings for it. you might have to get it from flexi-coil because some of the parts I could not get from john deere.
 

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We do own a 787 tank with small third tank although the plan is to use a different air drill this year. Its worked pretty good for us in the past but calibrating by cranking it 50 turns as we first tried when it was new ( with our drill size that represented 1/4 acre ) and we were totally out to lunch on what it actually put through while seeding, it put through less while seeding in our case. So we scrapped the cranking tests for that little tank but kept that procedure for the two main tanks. Starting off, trial and error by putting very little canola seed in and knowing the weight of what got dumped in, two 50 lb bags for example and with a theoretic 5 lb per acre rate one bag would do 10 acres. When we went as far as we dared and hopefully back to the pickup, then we would dump the remainder of the canola out of the gates by using a truck mud flap of all things stuffed under there to channel the product into a large rectangular plastic tub with lid ... walmart etc. Then poured that into five gallon pails to weigh by a beam scale to know exactly what product was left, that is a no fail way of calibrating but of course if you are wrong on the setting, its starting over and doing another test and it always made a difference if the canola had a shiny coating on it or was more of a dull dusty blue coating, the shiny coating flows through easier. We were working with a drill that was 44 feet so what we had it set to would be different for another width. To give you a possible starting point if your unit is very close to that width, settings between 9.5 and 10 were giving us that 5 lb per acre for canola. Granular innoculant varied whether it was peat or clay base as we have written setting 12 for 5 lb of peat base, and setting 10 for 6 lb of clay base.

I'll bet no two units will put through the same volume with the same setting but this might give some form of a starting number to work off of and that idea of taking the pains and time to dump and weigh as that is the most accurate way. With canola once calibrated we would fill or put in enough for a quarter section but we were really careful with the pea innoculant to keep the volume down as that product can compact and then its not going to flow properly.

Beware the left hand clutch on the meter roll for the small tank as we had ours suddenly decide not to stay engaged and was seeding out of one side of the tank. Those clutches and the ones on the other two tanks were updated in later years to a stronger magnet and I ended up changing them all. If in doubt, wire up the left hand clutch so there is no way it can disengage the roller !, the same works for the other rollers in a pinch as the main clutch turns on or off the large tanks , or the clutch beside it at the drive powering up the third tank.
 
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