update on 715 grinding corn

[steve in wi]

Well,I don,t seem to be gaining.adjusted feeder house chains.the rear concave is set at 7/8 and that's as far it will go down,the front I,ve adjust different ways up down.sieves and wind.the only thing I read is that I can,t adjust the cly speed no lower than 450,as what the om says I need different pulley on the belt drive, the one on will raise the rpms when switched so i need a bigger one on top.does anyone run a 715 to help thru this pull thing.I looked at the concave and wear bars,good has filler plates,machine was mostly used on beans before I got it.threashing is a simple concept but yet to make work, frustrating.set up the 6620 and 9500 no problems 715 have a learning curve here,once I figure this out I,ll be OK but wow.90% of the time its something simple so thanks guys.
 

[Dalet]

The combines you are used to running have learned from the past. The 715 is an old combine that needs additional parts apparently. My Dad had one years ago, but it wasn't one of his favorites, so short of curse words, I can't help you much..
 

[Haley]

I used to run a 615 and it is basically the same as a 715.your grinding problem may not be the combine but may be poor quality corn kernels.450 cyl speed shouldn't grind up corn like you are talking about and your concave setting sounds about right.Dont try to run too much through the recleaner and try to run the concave as wide as possible.I have combined a lot of dryland corn over the years that will crack and split no matter what you do.
 

[fixerupper]

I think haley is right. Might just be the corn. 450 isn't too terribly fast, not fast enough to do much grinding. A little more cracking, but not grinding. We used to have a bunch of 715's in the neighborhood and I never did hear much bad about the job they did. Does it have Aucherman (sp) cylinder bars by chance? Auchermans come up abruptly on the front of the bar where the factory ones are rounded. They help a lot in tough stringy crops but corn quality suffers a bit. I put Auchermans on my 105 Deere and it did crack more corn after that. I'm just grasping at straws and typing as I think so don't take it for gospel. Jim
 

[Kell]

Steve, can you take a photo of a bin sample spread out on a flat surface and post it? I'd like to see what you consider "too much grinding". Could be that you're placing an unreasonable quality requirement on corn grain coming out of a combine.
 

[steve in wi]

Ya it does have filler bars,their flat in the middle and go up to a 3/8 rounded edge,should I try to remove these?
 

[steve in wi]

Here's some samples, may have to do it in the daylight

 

[steve in wi]

Next picture

 

[Kell]

I'm not a professional grain inspector but based on experience with the grain I have sold, you're doing OK. The photos are on the dark side but I can see you have mostly whole kernels of corn. Yes, some are cracked or chipped whole kernels but a "whole" kernel is any kernel greater than 75% intact; this needs to constitute the majority of the sample to be considered corn grain. The medium-sized (<75% intact) pieces of cracked corn are still considered corn grain. Only the pieces of cracked corn about 1/8" in size or smaller will be counted against you as foreign material; along with dirt and dust. Beyond that... any stalk, weed seed, or diseased looking kernels will count as foreign material; which I can't see any of in the photos.

Your sample isn't *perfect*, but nobody's is. The goal is to: 1) maintain a sample that has a majority of whole corn, 2) minimize the small pieces of broken corn and dust, 3) minimize trash like stalks and cob pieces. Given these photos, I'd say your at around 2% FM (foreign material) on the high end and maybe just under 1% on the low end; which is definitely acceptable.
 

[Kell]

Also, if you really want to put your mind at ease, take a sample into an elevator and ask what they think.
 

[steve in wi]

Maybe i was being to picky,yes i'll take a sample to where i go.i wanted the local guys to start picking corn so i could see what their samples look like,thanks for having patience with me and my new old equipment. steve