Combines Accelerator Rolls

It seems that you are running too many tailings which come back in on the right hand side which overloads the shoe. Try closing your top chaffer a little and open your sieve a little. Also make sure your fingers are not missing on the distribution auger.

I think you would have more trouble blowing crop out if the rolls were bad. Be sure there is no blockage in fan output or intake areas. Switch flipper to return tailings to feed chain if you have that option. look for overthreshing in concave area. Bad cylinder or helical bars. Maybe reverse bars are installed. Faster cylinder speed or wider concave gap could get more crop over to seperator side. On the other hand slower cylinder speed may prevent grinding up crop to much. Don't be afraid of adjusting out of the range the book may show. It could be misleding what you see on the shoe stopped as compaired to being in operation. Maybe if you did a full load kill and took a look at what is on the shoe it could be accurate but I have never tried that trick.

The lugs are actually quite easy to replace. Just crawl in on the chaffer (probably close it first!) and you can unbolt the pieces from each shaft. THere are 8 pieces per roll. I have replaced some about 3 years ago (mine is an '88) because of some rodent injury. Wear is now looking significant. I believe I was quoted about $110 (Canadian)per section I really don't know how much wear is tolerable though. My guess is the acceleration of the material gradually diminishes as the degree of overlap declines. With the small shoe in these machines, they need that help in good wheat crops.

I think replacement is when the metal backing is showing.

The book says to replace when metal "innards" start to show. That would be fine probably for corn or beans (heavier crops) but I would suggest changing them when the "nubs" are wore off in small grains. We changed ours from the top rather than from the shoe. Worked ok for us - sure helps to have someone to turn the separator (by hand, of course!) for you. The bolts that hold the sections in are threaded right into the shaft. If you replace them from up above, you can remove that baffle along the left end of rolls to make access easier to those sections. I cannot remember the exact cost of all new sections for our R52 (replaced them last summer),but $860 seems to pop into mind. Another tip - while you're dinking around in there, check the tightness of the bolts that hold those distribution auger paddles to the shaft. We seemed to have a heckuva time keeping those things in the machine on our R50 and the 52 as well. We have replaced them all with the new style so hopefully we won't need to worry about them anymore. Had one set come loose on the 50 while doing cob-mix high moisture with no chaffer or sieve in - ended up in the clean grain auger tube where it exits the bottom of the shoe. Ouch! As long as you have the chaffer in like most sane people, they will mosey right on out the back. Good luck- Tom langan

I changed mine out two years ago, I think it takes 8 lugs for each roll. Best I can remember they come 4 lugs to a set and were about $100.00 per set. So about $800.00, but worth every cent in wheat and it you have hills. These keep the feed down on screens even. Cleans better and blows out less. I changed mine from top, hard for short fat boys to go in the bottom. Went real easy best I remember, and I remember the not easy ones.

Be careful with the air wrench. A 3_8's air ratchet might be a gentel choice. The bolts are tapped into a thin outer shell and can stripout if the luck isn't good that day. I have several which have been tapped out to 7_16's after a misshap. Of course my N7 has seen several new sets in its life.

G'Day bob

They will mosey right on out the back and nail a drive tire next year. Firestone and Goodyear to the rescue with a set of new ones. Tom in MN

About $700.00 on the roll kits, if you have the replaceable kind... We still see an combine once in a while that has the old style (non replaceable) Did you want to replace the front or rear raddleIJ