[markat425]

I'm on my last fields of corn for the season and have noticed I'm grinding some corn out the back. I slowed the cyl. speed to 350, opened the concave several times. Even with the concave set on 20 (just before clean out setting) it was still grinding some corn. It was leaving some grain on the cob when set there but was still grinding too. The tank sample has been very clean, so I open the bottom sieve a lot, thinking that I was re-cleaning to much. Still didn't make a difference.
This is my first year for this machine and have been very impressed with the nice clean job it has done and how easy it has been to set, until this farm. It has me baffled.
I should mention that this corn is running 160-180 bu/ac. @ 18% moisture. I'm going 2.5-2.8 mph.

Your thoughts would be appreciated.

Mark

 

[mike52ar]

What are your bars like? nice and sharp or worn? and the concave? do you have the filler plates in or out of the cylinder? with that dry of corn there is no need for them and the power increase will feel amazing.

 

[markat425]

Mike, My bars are nice and sharp. My concave is not worn or bent. It's level too. My filler plates are still in. I ran corn that was drier than this earlier this year and didn't grind any.
I'm running a lot of trash through the machine, but I would think that should help (make it full).

Mark

 

[twopop]

markat425, do you have all of the wires in the concave? We pull every other wire out of the concave before we install one. You won't get a dirty sample and your grain can get down on the auger bed sooner. I've seen combines that have a 'mat' of stuff on the concave and the grain can't get through, causing it to get ground up. I have to admit that usually, when we have your symptoms we find something bent, or the L.H. concave support (outside, directly above front axle) broken. Have you combined that particular hybrid before? Some numbers just shell extremely hard! Hope you discover something - it's always peace of mind to find the problem.

 

[markat425]

Thanks for the reply twopop. I honestly don't know if my concave has all the wires or not, but I'm gonna check it out. If they are all in there can the wires be removed with the concave in the machine? Can the concave be used for all other crops with some wires pulled?
If the concave support was broken (which it isn't), why would it always be the left one?

You're right about this hydrid. I haven't shelled it before. It's a smaller eared hybrid, planted thick in muck ground. The kernels seem to be "large round size".

Mark

 

[deerefever]

I agree with twopop about the wires, we either shorten every other or remove every other.Check your conveyor drive chain on feederhouse, is it on the small sprocket???also make sure your feederhouse drum is properly adjusted, raised postion, make sure you adjust both sides the same. Last thing I like to see done is open lower sieve fully, you don't need it for corn anyway , this will allow alot of flow so you won't get the return too full. Far as filler plates you realy don't need them , how ever with our messed up crop this year it was good to have them in for short cobs. hope this helps good luck deerefever.

 

[8820titan2]

How do those dual wheels do on that 6620? That's the first time I have ever seen duals on a 66.

 

[markat425]

8820titan2, They have done a super job for me. I put them on because I have one farm that is really wet muck with springs. I didn't have any trouble this years thanks to the duals and the RWA. I'll post some better quality pics when I get a chance.

Mark

 

[markat425]

8820t2, Here's the pics of my duals on the 6620. The primary tires are 24.5x32. I had a local welding shop make the spacer rings for me. The space between the tires is about 12 inches.

Mark



As you can see, I almost went too wide for the 643.

 

[trillagro]

hello, In the 6620 the concave is the same for corn or weath?
Thanks is my first time in a 6620 I'm from Chile SA

 

[SKfarming]

hello, In the 6620 the concave is the same for corn or weath?
Thanks is my first time in a 6620 I'm from Chile SA

Welcome to the forum trillagro. Yes the same concave is used in corn and wheat. You do have to adjust it closer to the cylinder for wheat, but it is the same concave.

 

[madcow]

i had this issue this year, but i this was my first time harvesting 13-15% corn. i put in new bars and concave, even then i still ground some.
i would open it up till cobs had some kernels on them then either speed the cylinder or tighten the concave to clean them up.
after doing 5 acres i would have a big pile of chaff on the rear axle with some ground corn in it. so i would go a 1/2 acre and then check the rear axle. kept doing that for a while, for every half acre there was almost none there. i was at some other farms with new machines and they had ground corn on rear axle or gussets on the machine.

some fields did grind more then others, and it was very frustrating to feel like a combine rock star coming out of one field to a loser coming out of the next.lol

 

[markat425]

If you are asking is the concave the same for all crops,, the answer is yes..