setting a jd 7700 for oats

[Anonymous-0]

I bought a very nice jd 7700 3 years ago that is in excellent looking condition and was maintained very well by the old owner it was one of the last 7700 combines built and has some 7720 parts however as good as it looks i just cant get it set perfect it either has too much chaff in the oats or too much oats coming out in the straw. I havent been to concerned because i just used it for my own use but i would like to do some for a neighbor and want to do a good job for him. I must be missing something or doing something wrong any help is appreciated

 

[Moline_guy]

Are you getting enough fan speed? That cast variable pulley that drives the fan can get wore down where the bearing rides and you won't get enough wind, don't know if thats your problem, but an easy fix is to put another bearing beside the other one so you can adjust the fan faster. The pulley is expensive but the bearing is under 20 bucks. We have combined a lot of oats with our 6600 and 7700 and they do a nice job.

 

[justanothercase]

did you let the oats go through a sweat period for dry down in the swaths sounds to me like it might be too wet. dont know for sure what all your doing though, very hard to walk through a combine set up on computer or phone without physically being there to see the variables in person.

 

[Butch(OH)]

Doing a good job in direct cut oats is about as tough as it gets for setting a combine in my experiance. The higher the yield and lighter the test the tougher it gets to get"em all and have a clean sample.The biggest thing we found was you must run slow, slower than any other crop. Dad had good luck cutting the air waaay back and setting the sieves closer, sorta like running a sreener instead of a chafer if you know what I mean? You must also have the treshing set right to do this, if your grinding the straw it doesnt work. It also doesnt work except in prime conditions, you dont start early and you DO quit early. I could never repete his results myself, good luck.

 

[Mike Aylward]

C. J., oats are actually one of the easiest crops to combine. To start with, look at how the oat plant itself comes out of the rear of the combine. It should be pretty much whole with the oats simply removed from it. If it is torn up you are over threshing. If you still have oats in the straw or not knocked off the plant you are underthreshing. Once you have the threshing set (with a combination of cylinder speed and concave setting) then set your sieves. In most conditions you will set your top sieve (chaffer) to where you can insert your index finger. Then set your bottom sieve to where you an insert your little finger. This isn't absolute but is a good place to start. Now you will set your fan speed to clean the oats. In all crops you want the chaff to float above the chaffer and not just bounce off the end of it. You can tell how you have the sieves and fan speed set by looking at the tailings return elevator behind your left foot. There should be very little material going through this elevator. You want a few kernels of oats and a little trash but not massive amounts of either. I would say you probably don't want over about 5 gallons a minute if your combine is set right. As you get used to your machine you can almost tell just by the sound of this elevator how it is set. You will want to run as much air as you can to float the chaff but not blow the oats out of the rear of the combine. Many people see oats on the ground and immediately lower the air when more often than not they need to increase the air. You always need to float the chaff in any crop so your sieves can do their job. You may need to tweak the bottom sieve if you are getting too many large chunks in your sample (common if you are running in green weeds) but even this can be taken care of with careful setting of cylinder speed and concave setting. Once you understand the fundamentals of how your combine works you should be able to set it without checking the recommended settings. They are just a starting point, not "gospel". Set your combine for conditions, not necessarily by the book. Mike