Combines excessive shoe loss in good corn

Do you have return to acc.rolls or to rotor tailing return.

return to acc rolls

This might not be your problem,but sometimes my 62 with an 8 row head will overload the right side of the chaffer with tailings and then grain out the back.Is your sample cleanIJ If so open sieve a little more.You mentioned new bars,is the cob breaking up more than usual,sometimes new ones get too aggressive.Hope some of this helps,know how frustating it can be.

your harvest rate is 28bpm with information given.machine is capable of 55bpm.is engine speed up to specsIJ are you using 1 5_8 round end chafferIJRH overload is generally seive not open enough. lH side is concave open too far.(threshing in cage instead of concave)is the fan or splitter_choke area pluggedIJare you overloading with broken cobIJ

what do you mean 'the shoe fills up'IJ Do you mean the clean grain auger can't take it away fast enoughIJ If so it sounds mechanical - like a bent auger flighting or a bent slide under the sieve. Too little air can cause shoe loading. IS the air choke open and touching the wide open stops and no buildup on top of choke. Are the fan blades clean and not coated with anything like an oil leak from the high pressure filter. Of course very high moisture corn with some green material doesn't slide very well. Eng RPM up thereIJ Don't have a shoe belt slipping do youIJ We have had this complaint on some machines and it proved to be shoe slowdown under load. Feel the belt and sheave - should be no warmer than any other belt. Paddles good in ChainIJ You don't have the shoe with perf holes and the cover removed do yaIJ Bottom line if one overloads the 60+ bu _ min capacity clean grain system the clean grain slip clutch should slip. An open top chaffer at 9_16" and sieve at about 3_8 + a little to maybe a half SHOUlD not give you this problem. If it runs fine for more than a minute THEN starts this you have a problem of too much tailings recirculating. What does the pacer say about the shoe lossIJ You SHURE it is shoe loss. Of course I would love to have 200bpa + and be able to go to the coffee shop and complain my old combine can't handle such a crop!

tbran,yes seems that it cant take it away fast enough. clean grain auger is fine,new chain and paddles last yr.,fan clear and clean and wide open. belt slippingIJ dont know but i will check that out. no perf holes in shoe. like you say, seems to run fine till i go about a 150 yds at steady 3mph then pacer slams back to slower, and i slow down, it takes forever for the pacer to catch up. i checked, it is shoe loss right behind shoe even over 3 rows,like you strowed it with a bucket,running 3.5-4 you cant hardly see the ground under it. you mentioned tailings, i have seive open so grain will fall thru.tailings are set to go back into the acc rolls. is it possiblethat it is too much volume going inIJ

yes, sample is clean. new bars last yr.

engine seems to be ok according to dash tach, 2200 stopped.we use square tooth chaffer.overload is even across shoe. we do have broken cobs, concave set at 13 on gauge.

Check that the clean grain auger shaft in the bottom of the sieve box is not broken in half. Caused us some grief until we eventually found it. There was no indication that anything was amiss mechanically. Everything was running quite OK except the lH end of the grain auger.

It wouldn't be that leaves are pluging tight up against leaf screen under fan and cutting off air in your condition would it. Maybe slowly cut back throttle when running empty to see when clean grain light comes on. You could tweak module to get light to come on at approx. 2000 engine RPM to get idea if clean grain is slowing up when under heavy load but there again you could feel belts to get idea of slipage. Don't know how hard you have to push to slip belt enough to get heat buildup. Hard to imagine belts slipping unless springs have loosened up or mud in pulleys. Have heard of people removeing complete sieve if it can't handle all the crop but that shouldn't be needed on a long shoe. Good luck