I guess maybe that is why some of you have more trouble seperating the crop material at the impeller than others...more material in the centre means more to separateSo, I was about to get the 740tt ready for wheat today. I was looking up the rock trap and IIRC, at about 700 engine hours, the APS "caps" are getting rounded, but not on the side of the APS, only the middle ones. I do not believe the returns are the primary cause of the cap wear, as it should do a decent job of spreading the material by the return auger design.
It appears I need to change something to make the header feed more evenly. I have noticed much more impeller wear in the middle as compared to the sides, as well as build-up of material above the impeller. On the other hand, at times I do a "power shut-down" and the chaffer load is spread very evenly side to side, a nice benefit to the Claas design IMO.
I guess I have a few options to modify the 40' FD70 to feed more evenly.
add more fingers to the side of the auger
remove some of the middle fingers
cut a few inches off the flighting in the middle, or cut it down to the tube
a combination of the above options
This is an issue a rotor machine really wouldn't be dealing with. Having said that, this should be fixable and doing so at the header will only help the combine work even better.
Seedcleaner I think you are on the right track by cutting back some of the flighting so it does not push the crop so far to the center. I have also cut out the square pieces in the outer bottom corners of the feeder house to get more space for big canola swaths. I was concerned about crop wrapping on the ends of the front drum but no problems so far. There is a lot of crop material that flows or wears on those outer corners of the drum but if there is a difference, the advantage of increased flow offsets the downside. Some guys on this forum are having trouble with chains jumping a tooth on one sprocket . I have not. I wondered about cutting a 45 degree diagonal off those plates or a curved patternI traded four random middle fingers and put two of them on each side of the feed auger. I put them inside the flighting where the paint is worn off from crop flow. I didn't think they would do much good hidden behind flighting. The next thing to do would be remove some inner flighting if this doesnt do the trick.