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cutting beans at 5.5mph sounds tooo fast, 3.5-4,3mph more like it. Install new fuel filters if there is a question. You need to set rotor at 5-600 rpm (higher figure for wet beans/green stalks). I usually run my fan speed at max (1000rpm). I usually run the concave (front cage around rotor) about 3.5-4.5 for soybeans. You can run concaves at a closer setting if you have excessive engine power consumption. I had what was called a corn seive (top seive as you look in back end) in my 1680 and I usually ran it and bottom seive pretty well closed, maybe open 3/8" to 1/2". your Grain loss monitor will have 2 dials to turn, one has three settings, small, medium and large and is for the size of particle you want to "read". The second dial has numbers 1-9, the higher # selected the easier/quicker GLM indicator needle will "read" (lower # will need larger loss /flow in order to make needle rise). I usually set my GLM top dial in the medium position for both beans and corn and the bottom dial 8 beans, 7 for corn. You need to harvest enough crop to get returns in combine working (4-500'??) and then check on ground behind combine, if loss is at acceptable levels, harvest crop at same speed as test strip and set GLM bottom dial so needle will run in the middle of green. Try these settings as a starting points. Might be a good investment in a owners manual. Good luck.
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