[torriem]

If by pre sieve you mean the bit of the sieve at the font of the top sieve, that should never be open very wide. At most the pre sieve should be open as wide as the size of the grain you are harvesting. In other words mostly closed. It's there for corn.

If you're talking about the top sieve (the chaffer), that's another story. In theory the 8230 sieves should be set identically to the way you set them in New Holland. The New Holland CR and the 8230 share the same cleaning system.

In my conditions, in wheat, we find the best results closing the top sieve down maybe to 10 and opening the bottom sieve, perhaps to 12. In my opinion the rethresher doesn't do much in small grains, so cleaning with the top sieve essentially bypasses it. If there are increased losses because of that, it means something needs to be changed in the rotor. Such as closing the concaves a bit, or speeding up the rotor some. Sieves actually work best when the material is suspended by air, with the grain just heavy enough to fall through it. Someone on the forum has a technique for tuning the air flow but I never quite figured out his procedure.

But most people run the sieves conventionally and seems like it works fine most of the time. I think you'll find on the 8230 if you start with the computer's default settings for your crop type, you'll have better luck than if you just try to set it according to your memory of other past machines. Can make changes from there of course, but it's a good starting point.

 

[torriem]

Fit top sieve rear curtains before refitting top sieves.

Rod do you have a part number on those curtains you showed pictures of? I see two different part numbers but I think one of them is for 1 1/8" sieve (part number 47622785), and the other is for the corn sieve. Not sure why they are different.

 

[torriem]

Yeah. I'm pretty sure the narrower one is the one for the sieves we run?