We just finished installing a concave and are setting the clearances. What kind of clearance should I have between the APS paddles and removable pre concaves? The book shows 2mm but theres about half an inch now. Our dealer said to set the main concave and leave the aps where it is. Any thoughts? 590R for small grains Thanks.
APS clearance
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Lex APS clearance
That's interesting you found a spec of 2mm. I have never seen or heard one officially. And at what main concave setting is that. My best guess is to set the main concave at minimum - 7mm and then the clearance between the APS paddles and the front concave should be about the thickness of a knuckle on your 1st or 2nd finger ( 1/2 to 3/4" ??) There have been a few posts on this forum about that. What do you other guys think? I think it was SouthernSK that was trying a wider space to lessen the plugging problems. I think the verdict was still out on whether that was the right answer. What's the verdict SSK? Thanks.
Another solution may be to run the Sunnybrook cylinder faster as it takes more material away.
That's interesting you found a spec of 2mm. I have never seen or heard one officially. And at what main concave setting is that. My best guess is to set the main concave at minimum - 7mm and then the clearance between the APS paddles and the front concave should be about the thickness of a knuckle on your 1st or 2nd finger ( 1/2 to 3/4" ??) There have been a few posts on this forum about that. What do you other guys think? I think it was SouthernSK that was trying a wider space to lessen the plugging problems. I think the verdict was still out on whether that was the right answer. What's the verdict SSK? Thanks.
Another solution may be to run the Sunnybrook cylinder faster as it takes more material away.
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I increased my APS clearance and after that I broke 4 APS belts in about a weeks time. There is no 2mm spec that I am aware of. The only spec is for the distance between pins on the linkage for the APS. I would not increase the gap. It seems like the wads go in to deep causing the belts to break rather than slip.
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In 2011, our 740 was new and new to me. I slipped the APS a few times. Shortly after that, I increased the APS clearance. I believe it helped. This is mainly for soybeans, running from 300-500 rpm. I have never broken a belt...only slipped, and that is with them set pretty tight.
I don't know what the right answer is...but you want it level left to right, you don't want anything touching when set tight, and on the main concave, you want a pinch point, concave getting closer to cylinder in back.
I don't know what the right answer is...but you want it level left to right, you don't want anything touching when set tight, and on the main concave, you want a pinch point, concave getting closer to cylinder in back.
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In the service manual for the 480 they list the clearance as +/- 2mm almost as if they forgot to put the actual clearance in.
We've been setting them up as tight as we can and aps belts are not much of a problem.
Actually find more folks with sunnybrook cylinders having APS issues and I think its because the factory cylinder is a more aggressive processor when it comes to wads due to the large gaps between bars like a coarse gear.
We've been setting them up as tight as we can and aps belts are not much of a problem.
Actually find more folks with sunnybrook cylinders having APS issues and I think its because the factory cylinder is a more aggressive processor when it comes to wads due to the large gaps between bars like a coarse gear.
I checked the book again and you are right joesixpack, the book doesnt list the clearance just +/-2mm. We set the concave in the front to 8mm and the rear at 2mm. I like to be able to get it as tight as possible without hitting the cylinder. We combine a fair amount of flax and tighter tolerances help. Thanks again guys.
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My early 740 manual (575 manual on some pages) refers to this +/- 2 mm measurement. I interpreted it as the left to right clearence should be within 2 mm...not 2 mm gap between grates and APS drum.
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We established that. So what's the clearance supposed to be?
We're all small grains so we setup the concave 6mm front, just off ticking the high bar in the back.
Pretty sure we have the aps almost up at the mechanical stops.
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I guess it isn't too critical, not really a number printed anywhere, and that might be a good thing. I think it really depends on the crop and conditions.
Maybe in the future, the APS linkage and disawning can be controlled on the go from cab allowing better tuning of the machine.
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