Combines perfect circle concaves

[dakota]

I wouldn't know how the concave can help the shoe overloading in corn. The corn needs to go there. What happens when you open the precleaner and the chaffer moreIJ

 

[Winst]

Save your money. When I first saw your post, I wondered how anyone could overload the shoe in corn. Then I saw the hillside thing. No combine I have ever used has worked well on a hillside. I have built dividers, experimented with different fan settings, etc, on different brands of combines and there are only two answers. Slow down, or buy a hillside machine. Steep hills can easily cut your capacity in half or less, if you want to do a good job of saving grain.

 

[jd7800]

hey, stop and think for a minute!!!!! when you drop the grain sooner in the combine ie getting it out of the concave rather than loading it on the walkers you improve the capacity of the machine in flat ground as well as the hillsides. you are thinking the right way with the dividers only you need to get it on the precleaner and shoe alittle sooner to benefit you. the wider spaced bars as well as removing wires in dry corn can improve cleaning capacity emencily. if the seperating is done on the walkers all the grain comes down to the shoe on the downhill side thus overloading the shoe even before it has a chance to start seperating the grain from the "mog" (material other than grain)you should never allow grain to be seperated through the precleaner it is used for starting the mog seperation process. if you allow grain to pass thru the pc you are starving the rest of the cleaning system for the air it needs to complete the cleaning process thus reducing capacity.the use of the perfect circle concave that is much the same design as the 20 series machines is the right way of thinking. the early 9000 series concaves are a bannana shape rather than a concentric shape to the concave therefore giving you really two settings for the concave to do optimum threshing one for high moisture grain and the other for dry grain. the 10cseries concaves lets you use the most conventional way of thinking to thresh your crop. (if kernals left on whole cob tighten concave, if kernals left on broken cob open concave) the removal of wires can also benefit you in dry stalk and dry grain situations as it lets the free threshed grain fall onto the shoe faster thus reducing the need for added risers and unnecessary reduced speed on hillsides. if yo uwould like to talk more i would appreciate your response.

 

[Iaangus]

I would like the cylinder to kick more stuff up to the walkers and try to keep it off the shoe, I seem to never have losses over the walkers.

 

[iaangus]

Aren't you telling me what I just saidIJ concave with wider spacing at front, more air from a updated fan(ten series) so I can open the precleaner and still have enough air for the siev and chaffer. That does make sense about the stuff from the walkers all landing on the down hill side and over loading the shoe from the start. I have never tried taking wires out, at what moisture can that start to work out OK. I useually start combining at around 23% moisture and what about small grains and beans, do I need the wires back in for that. Does the concave need to be taken out for that or feeder house removedIJ

 

[John_W]

I don't think you want to push stuff to the walkers. Overloaded walkers and grain loss from the walkers is the most common problem with conventional combines and the reason most new combines are rotaries. Besides any grain saved by the walkers ends up on the chaffer anyway. You need to separate the grain as soon as possible at the concaves and do what you can not to overthresh and wind up with a lot of extra MOG on the shoe. You might check your sieves as closing the sieves too tight can restrict the air flow and cause grain to sluff over the chaffer. line bored concaves tend to be more agressive and backfeed over the cylinder which would not help your situation. But wider openings would be a good idea in corn and beans. Check out the options that loewen has for concaves.

 

[dakota]

In general I agree with John W below. Make sure your chaffer and precleaner are open enough. There are long tooth chaffers for corn made, too. But if you absolutely want stuff up to the walkers, fill the rear of your concave with concave inserts. That should make all the trash go up there.

 

[jd7800]

what small grains are you harvestingIJ we have had good luck with wires out in soybeans and corn that is harvested with a dry stalk. if you are harvesting with green leaves and the wires out it can plug the concave. to remove wires remove the plate in front of the concave at stone trap access i think there are 7 nuts to remove. they are not really a fun thing to be removing and replacing all the time but really make more difference than the inserts do. you need to start at each side of the concave and work to the middle removing 1 and leaving 2.we have used the wires out in wheat also but seem to get some white caps in damp conditions.