Combines lower Sieve

If you're running the sieve fully open, you're doing virtually all of your cleaning with the chaffer already. If your sample has been suitable, the bottom sieve is probably not required. You'll also get more air to the chaffer by removing it.

Will this not throw the system out of balanceIJ Don't you need the mass of the shoe to balance the mass of the chaffer at the end of each half-strokeIJ Todd

I don't believe the weight of the sieve has much to do with balancing the load. It's actually off center toward the rear. The shoe seems to run more smoothly without it installed. If the lower rails appear to have some play from left to right, I might suggest an open frame made of square tubing be installed to prevent the rails from collapsing inward.

Removing the bottom sieve is one of my givens when doing corn, just like attaching a corn head.

I met a farmer that runs without bottom sieve in 1460 and as far as I know, it never created any problems.

I've been running with the bottom sieve all the way open for 20 yrs , started with a JD7700, now with a 1660 . I left it in thinking it would help hold things together if that makes sense . It has worked for me and a lots of others around here . We do just corn and beans , forgot to mention that . JIM