Cr 8.90 rotor losses

[del_boy]

Im experiencing high rotor losses these last few days, alot more than i have all season. In simular crops with similar straw and for some reason im getting double the losses. Have tried every setting and combination possible, have tried moving the rotor vanes but no help. I was getting 55-60t/hr output but i can barely achieve 40t/hr now, even at 40t the rotor losses are way to high, any faster and it gets really bad. Ive gone from 5.5k down to 3.5k .Checked the concave and its all clear. Any ideas

 

[Badshot]

Is it over thrashing the straw now?

 

[del_boy]

Is it over thrashing the straw now?

No. The straw is coming out pretty good still, had the concave right open on 35mm and made no difference at all. If anything a tighter concave is better

 

[Brisel]

What else has changed? Variety? Are the losses at the header or just in the swath? Some reports of ears shedding. Are you seeing the grains on the ground?

What rotor speeds are you using? I've just finished Lili which is a bitch to thresh. So many tips in the sample. 1300 rpm rotor, 12mm concave, concave in (move the outer retaining bolts in one hole), 50% rotor vane position, tight bottom sieve, fast fan but the hard threshing is dumping broken straw on the sieves. 55 rotor loss setting. I'm on 22" rotors in a 9.90, so bigger than yours - I think yours are the smaller diameter ones. The previous variety cut was Graham which took no threshing at all - concaves out, wide open, 80% advanced vanes etc. 75 t/hr outputs limited only by hp running the chopper.

 

[del_boy]

Ive have changed variety 3 times but ended up back in some graham which was a joy to cut a week ago with hardly any losses, running quite happily at 55t/hr back in graham now same crop struggling to get above 37t/hr. Losses are under the straw only. Rotor loss monitor nearly halfway up with 20 plus grains on the floor under a hand, was previously 6-8 grains. Am crawling along to keep losses down which is the only way. Currently on 15mm concave and 1250 rotor.

 

[db9go]

What else has changed? Variety? Are the losses at the header or just in the swath? Some reports of ears shedding. Are you seeing the grains on the ground?

What rotor speeds are you using? I've just finished Lili which is a bitch to thresh. So many tips in the sample. 1300 rpm rotor, 12mm concave, concave in (move the outer retaining bolts in one hole), 50% rotor vane position, tight bottom sieve, fast fan but the hard threshing is dumping broken straw on the sieves. 55 rotor loss setting. I'm on 22" rotors in a 9.90, so bigger than yours - I think yours are the smaller diameter ones. The previous variety cut was Graham which took no threshing at all - concaves out, wide open, 80% advanced vanes etc. 75 t/hr outputs limited only by hp running the chopper.

CR8.90 is the same body and rotors as CR9.90 and same sieves the main difference is engine HP

 

[Brisel]

Ive have changed variety 3 times but ended up back in some graham which was a joy to cut a week ago with hardly any losses, running quite happily at 55t/hr back in graham now same crop struggling to get above 37t/hr. Losses are under the straw only. Rotor loss monitor nearly halfway up with 20 plus grains on the floor under a hand, was previously 6-8 grains. Am crawling along to keep losses down which is the only way. Currently on 15mm concave and 1250 rotor.

Bizzare. What happens when you lower the concave? That’s a fast rotor speed. Mine was around 1300 rpm and 18mm. I can’t remember what type concaves I’ve got but they were the standard ones. Try a kill stall to get a snapshot of what’s going on inside. This late in the season I’d guess that the straw is getting pretty smashed up.

 

[del_boy]

Bizzare. What happens when you lower the concave? That’s a fast rotor speed. Mine was around 1300 rpm and 18mm. I can’t remember what type concaves I’ve got but they were the standard ones. Try a kill stall to get a snapshot of what’s going on inside. This late in the season I’d guess that the straw is getting pretty smashed up.

Tighter concave certainly helps.
Currently in a 4t crop of sundance concave 13mm rotor speed 1200
At 35t/hr 80% engine load i have 6 grains under my hand, if i push on up to 45t/hr 100% engine load i get 33 grains under my hand. The loss monitor is definitely working.

 

[del_boy]

Opening the concave above 15mm and losses shoot up like crazy

 

[del_boy]

Bizzare. What happens when you lower the concave? That’s a fast rotor speed. Mine was around 1300 rpm and 18mm. I can’t remember what type concaves I’ve got but they were the standard ones. Try a kill stall to get a snapshot of what’s going on inside. This late in the season I’d guess that the straw is getting pretty smashed up.

I noticed last night all my rotor losses are off the 1 side only. Proved this by loading one side of the header more than the other and then the opposite the other way. Seems there is a restriction where the crop is entering the rotors or at the top of the broad elevator, the crop isnt being presented correctly to the rotors. Not sure what yet though

 

[Badshot]

I noticed last night all my rotor losses are off the 1 side only. Proved this by loading one side of the header more than the other and then the opposite the other way. Seems there is a restriction where the crop is entering the rotors or at the top of the broad elevator, the crop isnt being presented correctly to the rotors. Not sure what yet though

What happens to the returns on these?
Could there be too many returns being dumped on one side with overloaded sieves ?

 

[db9go]

Tighter concave certainly helps.
Currently in a 4t crop of sundance concave 13mm rotor speed 1200
At 35t/hr 80% engine load i have 6 grains under my hand, if i push on up to 45t/hr 100% engine load i get 33 grains under my hand. The loss monitor is definitely working.

How old is your machine has it got a DFR rotor the first one we had did not have one

 

[Two Tone]

I noticed last night all my rotor losses are off the 1 side only. Proved this by loading one side of the header more than the other and then the opposite the other way. Seems there is a restriction where the crop is entering the rotors or at the top of the broad elevator, the crop isnt being presented correctly to the rotors. Not sure what yet though

This suggests that there is something wrong with one of the rotors or concave. Or possibly an impeller.

 

[Brisel]

I noticed last night all my rotor losses are off the 1 side only. Proved this by loading one side of the header more than the other and then the opposite the other way. Seems there is a restriction where the crop is entering the rotors or at the top of the broad elevator, the crop isnt being presented correctly to the rotors. Not sure what yet though

Now we're getting somewhere. Mine has a DFR, so is harder to see the rotor ends. Does yours have DFR? Check the flights on the end of the screw sections of the rotors & any internal reasons why crop isn't being presented to both rotors evenly.

What does the feeder house elevator look like? equally polished on both sides? Table auger flights uneven lengths?

 

[db9go]

Now we're getting somewhere. Mine has a DFR, so is harder to see the rotor ends. Does yours have DFR? Check the flights on the end of the screw sections of the rotors & any internal reasons why crop isn't being presented to both rotors evenly.
View attachment 831224
View attachment 831225
What does the feeder house elevator look like? equally polished on both sides? Table auger flights uneven lengths?

On our last one with out DFR we had a build up of soil at the top of the elevator that caused some problem

 

[del_boy]

Yeah its got the dfr roller, all looks ok in there. Took the half moons off on front of rotor covers and the flights are all ok on both rotors. Elevator chain equal both sides, no restriction up as far as the dfr roller.
Done a kill stall the 1st swipe down a field so full and even header revealed alot more straw in the one rotor, the left rotor had noticeably more straw than the right side, the loss monitor shows more losses on the left so thats all working, also more grains on the floor on the left side. The only bit we cant see to check is the very back of the dfr roller/ front of rotors.
Both concaves are all ok
Different crop and variety today so the problem isnt showing off as well as it was yesterday

 

[Bumble Bee]

If you have been cutting a lot of laid crops, check that the concaves are not blocked with soil. I've just had this on my CR 9.80!

 

[del_boy]

If you have been cutting a lot of laid crops, check that the concaves are not blocked with soil. I've just had this on my CR 9.80!

Ive dropped both concaves out and both were clean.
Finished off cutting a field of spring barley yesterday and it would not feed into the rotors, kept coming back down the broad elevator, what straw was going through was coming out very puffy and the row of straw looks like its all in wads not a continuous flow at all.
We've finished now so a winter job and pull the front off and have a look

 

[db9go]

Ive dropped both concaves out and both were clean.
Finished off cutting a field of spring barley yesterday and it would not feed into the rotors, kept coming back down the broad elevator, what straw was going through was coming out very puffy and the row of straw looks like its all in wads not a continuous flow at all.
We've finished now so a winter job and pull the front off and have a look

When we have straw coming down the elevator its because we have pick up some soil under the auger or at the top of the elevator
We have had it with and without a DFR roller

 

[del_boy]

Cant see nothing obvious. Under the auger is clean and elevator floor as far as the dfr is really shiny