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Discussion Starter · #1 ·
I use a tow behind ground driven metering system flexicoil 2320 air seeder behind a caseih pd500 air drill. I get a bunched or wavy seed pattern behind the drill. Even across the width of the drill, but high density for about 10’ of seed row and low density for about the same distance. When the crop emerges it looks wavy. Why is this? Is something wrong with my metering system? Is it air related? Thanks for your input.
 

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How much product are you putting down? If I were to guess it would be you aren't running enough fan speed.

Exapta did a webinar on drill air system optimization, this discuss exactly the problem you are having:
 

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I never had that problem with the one I had so I can't comment from experience and as was just said about running too slow a fan speed may be the problem or part of it. What I was curious about is the metering roll courseness you were using for the given seed type/size you were seeding and seeding rate would be the other aspect of this. What I am curious of is lets say for example you were using an extra course meter roll and in order to put on a relatively light amount of small seed the meter would have to turn very slowly and with that would come a somewhat uneven flow vs a less course roller that would have to turn over somewhat faster and even out the flow rate. Its been some years since I was using one but it does show meter roll RPM ?, also does that RPM seem fairly steady.
 

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What are you seeding and what rates? What meter rollers are you using? What fans speed? Air flow sensor numbers? When you hand crank it, does the meter turn fairly smoothly and consistently? The pattern you describe points to the metering in my opinion, but air flow could be part of it.
 

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Discussion Starter · #5 ·
Fine meter roller in wheat and barley 120-130 lbs per acres in wheat with 80 lbs of starter like 11-52 or 40 rock. Fan speed shows steady and the velocity I keep around 5100. I want to say this is within the range the manual suggests. Maybe I ought to speed it up a bit and see if it fixes it.
 

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That's the velocity number I work with also. Should be okay.

I can't remember how the transmission works, but is it possible it's slipping? Maybe the meter isn't rolling quite as freely as it should?
 

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Discussion Starter · #8 ·
That's the velocity number I work with also. Should be okay.

I can't remember how the transmission works, but is it possible it's slipping? Maybe the meter isn't rolling quite as freely as it should?
Yes I just read the one way clutches can cause this. Will check it out.
 

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Discussion Starter · #9 ·
Have you checked to make sure the pressurization tube into that tank is clear, there is a possibility it could have some crap in it but still flow some air.
No I haven’t. Is there a way to do this without removing the fan?
 

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There are two one way clutches in the meter gear box. If one is slipping, it would only rotate the meter half the time, probably would look wavy. Hand crank and watch. the meter should never quite stop as it speeds up and slows down.

Or as others said, if turning much too slow trying to meter a small quantity with a big roller.
 

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No I haven’t. Is there a way to do this without removing the fan?
Its been a while since I was last in a tank of that style so you can confirm if that is correct that under the tanks there is a hose that connects to each ladder frame ( I believe its one side of the ladder tube on those models ) and the air exits at the top of that ladder tube to pressurize the tank. If lets say a person really crammed in the seed or fert into a tank its possible to have product fall down into that tube and block the tube. To check it you run the fan at your normal speed and with product down enough that you can reach into the tank by popping only one lid at a time you should be able to feel or even hear the air flowing out of the top of that tube, check both tanks to compare your findings. If you can't feel anything then you would have to disconnect the hose on the underside of the tank and test at that point and if you have air flow or find that flex hose plugged with crap or its up into the ladder itself. I never had one plugged so I had never had to deal with unplugging one. Although for whatever reason I never did test the air flow around the lid if popped up, one compared to the other as I was just checking the sealing around each lid when it was pressurized which you should do as well just to confirm you are not loosing air around the sealing rim of the lid for some reason, bad seal or the lid clamp is not pressing down hard enough.
 

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I had one of the engineers from flexicoil ride along with me one time and she said there is supposed to be a little bit of mixing and smoothing action going on in the tubes on the way to the drill, she said too high of a fan speed could lead to this tiger striping because the air is blasting it through too fast. We have removed the outside row tube and hold the end of the tube level with the frame pointing straight up, run some seed through the system...... whatever comes out of the tube should soot up about 18” above the frame. Our fame speed is usually 4400 rpm.
 

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Discussion Starter · #14 ·
I had one of the engineers from flexicoil ride along with me one time and she said there is supposed to be a little bit of mixing and smoothing action going on in the tubes on the way to the drill, she said too high of a fan speed could lead to this tiger striping because the air is blasting it through too fast. We have removed the outside row tube and hold the end of the tube level with the frame pointing straight up, run some seed through the system...... whatever comes out of the tube should soot up about 18” above the frame. Our fame speed is usually 4400 rpm.
Oh wow. Thanks for this!
 

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Had our seed metering gearbox pack up on Sunday, as Jvw said one of the clutches was slipping, our rate in the cab basically halved,a few hectares of barley got seeded like this hoping it would ‘fix itself’ so be interesting to see how it looks when it comes up
 

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House, I am wondering then if you noticed your seed rate being much lower then what your target was, another words could do many more acres on a tank of seed. If that is not the case, then I would think that would not lean to a lack of tank pressurization or slipping clutch issues. Thought I would throw that out as I don't recall it being said the seed volume used was in question.
 

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Discussion Starter · #17 ·
House, I am wondering then if you noticed your seed rate being much lower then what your target was, another words could do many more acres on a tank of seed. If that is not the case, then I would think that would not lean to a lack of tank pressurization or slipping clutch issues. Thought I would throw that out as I don't recall it being said the seed volume used was in question.
This is my second year with this cart. Yes, last year my cart seeded 10 lbs lighter than my calibrated target rate. This year, I replaced the meter wear plates and and did a field check walking along side the machine to count the crank revolutions for a quarter acre. This gave me some semblance of confidence that my stationary calibration was somewhat accurate. Now it’s seeding about 5 lbs lbs heavier than my targeted calibration of a 125 lb barley seeding rate.
 

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Discussion Starter · #18 ·
162644

So, this evening I started working on this. I found that my lid had some surface rust that was causing some air leak. This was in multiple places on the rear tank. In the pic you can see where dust was sneaking through on the seal. I cleaned up the rust and flaky paint with a wire wheel and repainted. Could this have been my problem? I suppose I’m going to have to start using petroleum jelly on the seal to help it seal air tight?

I did buy the clutches so I will be working on Putting those in tomorrow.
 

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Discussion Starter · #19 ·
Its been a while since I was last in a tank of that style so you can confirm if that is correct that under the tanks there is a hose that connects to each ladder frame ( I believe its one side of the ladder tube on those models ) and the air exits at the top of that ladder tube to pressurize the tank. If lets say a person really crammed in the seed or fert into a tank its possible to have product fall down into that tube and block the tube. To check it you run the fan at your normal speed and with product down enough that you can reach into the tank by popping only one lid at a time you should be able to feel or even hear the air flowing out of the top of that tube, check both tanks to compare your findings. If you can't feel anything then you would have to disconnect the hose on the underside of the tank and test at that point and if you have air flow or find that flex hose plugged with crap or its up into the ladder itself. I never had one plugged so I had never had to deal with unplugging one. Although for whatever reason I never did test the air flow around the lid if popped up, one compared to the other as I was just checking the sealing around each lid when it was pressurized which you should do as well just to confirm you are not loosing air around the sealing rim of the lid for some reason, bad seal or the lid clamp is not pressing down hard enough.
162645

Here’s mine! The air comes through those 1” hoses that are clamped into that square tubing on both sides. The air enters the tank through the top of both of the lengths of square tubing. Both were putting out air!
 

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Well from what you say it seems the seeding rate is not way under what you set it at so that certainly has me stumped in the case of either a clutch issue or too much air leaking out the tank lid. In theory quite a bit less seed should be used if either of those were issues. So much for my bright ideas !. In saying that, that doesn't mean you don't have a clutch or sealing issue. As to what the setup is like in that tank, I guess it has been a while since I last was in one of those tanks as I was having a hard time visualizing what the setup was like but the square pipe is familiar. In any event you felt the air flowing out both of those pipes and a pretty good air flow so I can't see that being a problem. The lid leaking, very good question as to how much leaking around the seal it can take before it would be enough to cause an issue but in reality you shouldn't be feeling any air with a good sealing lid. I suppose those rubber seals can get firmer over time but I never replaced any of them on my unit and also never had any rust on a lid. How is the clamping force of your over center lever as I would do what you are doing painting on the lid and then see if you think the lever needs a bit of tightening to give a bit more clamping force. Then run the fan at the speed you have been using and feel around the lids, then crank up the fan to 5000 rpm for example if your tractor can and test again as the higher the fan speed the more air pressure gets developed pushing on those lids. Hopefully I haven't been the cause of you chasing your tail too much, at least you now know to check those air tubes for air and the tank lids that they are holding. Always wipe all seed/fert/dust etc off the seals before you close the lids to give it the best chance possible to seal ( and I imagine you have been ) . Like had been brought up as well, maybe fan speed is causing a slugging effect, again never had that happen with an air drill but I have seen a neighbours crop look like you describe with thin and thicker area's all down the row of plants and was not this brand of tank but there was some reason for it although I never heard what the issue was.
 
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