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I have a 1688 thats due for new concaves. For our crops (R.S. wheat, canola, oats, flax, & soybeans) we use the small wire mostly but like to use some lg wire for oats and all 3 lg wire for soys. If theres a chance of switching back and forth between wheat and oats I'll leave the sm wire in. I hate changing them in the middle of harvest. I was talking to a guy at Harvest Services in Sask. and he has me pretty well sold on putting in just their large wires and using cover plates for harder threshing crops. Anyone with the crops I mentioned doing this? Also was wondering if anyone has concaves from Harvest Services. I have the specialty rotor and was also thinking of trying at least 12 Gorden bars. Thanks
 

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Ran a 1688 for 14 years in spring wheat , durum, barley, oats, flax, canola, and oil sunflowers. Tried cover plates in all crops but only was satisfied with there use in sunflowers and just on the seperator grates. I didn't enjoy changing concaves throughout the season, but felt that is one of the bonuses of a rotor machine. You can tailor it to the crop your harvesting. Biggest problem I found is that they limited capacity. You had to slow down in order to maintain acceptable rotor losses.

Seemed to have best luck running narrows for wheat , canola and flax. Narrow, wide, wide for oats, barley . Narrow, wide, wide with covers over seperator grates in oil sunflowers. Sometimes tried different combinations in sunflowers depending on how dry they were(breaking up too much). Always kept slotted seperator grates in.

Not sure how harvest services concaves differ. Maybe cover plates will work for you. Just my $.02.
 

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i tried cover plates in wheat, with slotted grates. I couldn't get an acceptable sample until i put small wires in the front 2 positions. If you want to keep the machine running best and be able to easily change concaves go with the half concaves so they are easier to handle. I have it down to about 20 minute job to change all 3 with regular size concaves.
 

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I have fought my 2188 for years and tried to find a good combo for small grain. We harvest hrww and some spring wheat in that 60-90 bpa area. I started with all according to the book, all small wire and slotted grates. I most recently tired one small wire in the front, then two large wire with all the wires in. I ran keystock grates. I think it works ok, at least best i've come up with. I am curious about cover plates, but never tried them, don't know much about them.
 

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Most everybody in this area runs the first two concaves with the small wires for wheat and the large wire in the third concave, I feel that the sample is very exceptable and I don't get docked at the elevators for material. There have been years that some guys have had to put the first small wire in to do hard to thrash soybeans, I've never tried any cover plates..............
 

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We use sm wire helical first then standard large wire and then a standard small wire and keystock grates in wheat barley canola and a few oats.

The theory is more aggesive theshing with helical, then large wire then lets more grain through and third small wire improves threshing of returns.

I like it. I think it does increase output and improves sample.I find we can run concave one number higher but never done a real like for like test.

Only down side is perhaps more trash on sieves in canola but again never done a real test.
 
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