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Discussion Starter #1
I hadn't tried until now when I got my corn head on. Seems that my feederhouse is stuck at 480 rpm. I suppose I should adjust the pulley position to get 520 like the manual says. Anyway I checked the solenoids, 1 and 5 are magnatized like they should be for raising speed, and it sounds like it's pushing oil, or bypassing some anyway. Wondering if the sheaves are just froze up from not being moved. How can I free them up without beating the crap out of them? I've kept them greased but maybe they were rusted or froze from before I got it. Thinking about trying to shove a ton of grease in there and see if it helps any.

1992 model 9600 if it matters, I bought it this spring.

Also a side question, do I really need to change the chopper to low speed for corn? Looking at the pullies I would say it has never been on low speed before, and it did corn before I had it from what I was told. I'm going to try it that way and see what it does anyway.
 

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Is the hydraulic hose attached to the port on the drive sheave?
I realize that sounds fairly obvious but...
520 is supposed to be be the minimum feeder shaft speed anyway,
if that's all you want just adjust your belt.

Don
 

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Maybe the o-ring in the cylinder is leaking the oil into the sheave. Had that happen. Or dirt in the restrictor in the hose.

I run the chopper in low for corn, just too abusive in my opinion.
 

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Nar,
I would put the chopper in the slow position, first it's really simple and it will also keep your straw walkers from getting beat up so bad with cobs. just my 2cents
 

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Discussion Starter #6
Thanks, maybe I will just put the chopper on low then.
I unconnected and recoupled the hose first thing, to make sure there was no crud in it. Maybe there is some farther in. I don't see any obvious oil leaking outside the sheave. Maybe I will try hooking that hose to another hose and see if it blows oil out. It sounds like it bypasses in the solenoid block, so it's at least trying to do something.
 

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i was gonna say the same thing about making sure the right hand side (sitting in the cab) hoses are looped together. We had the problem of our speed would go back to slow after we shut the combine down and we had to keep adjusting it everytime we turned it back on with the reel button on the hydro lever.

As far as speed, the faster the better, we ran ours as high as it'd get (750-790rpm if i remember right, i kinda forget things year to year).

just dont forget to change your speed back down to 500rpm before you take the cornhead off, otherwise you'll snap your sickle in half on your platform in about 4 seconds.
 

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Discussion Starter #8
Actually no, we won't always run the head that fast. When corn gets down really dry, 12 and under, we run it slow as it goes so it doesn't shell everything in the head. I've ran corn before plenty of times, just never with my own machine. That was one of the main reasons I bought a combine, the stupid ba****d we had doing our corn last year wanted to run the head as fast as it went and run 6 mph in short corn that was 9 moisture. When I made him stop and changed his head speed and ground speed we got almost twice as much in a round as he had been. He cost us a ton of money. He lost all his customers over the years because of doing things that way.
 

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gotcha, we've never combined corn under 14% moisture so butt shelling isn't really an issue...hopefully you get it figured out, im not much of a combine expert just thinkin of the common problems we always saw.
 

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I don't know or doubt if this applies, but on my 4420 there is a variable speed drive too. There is a set up, I think on the left side of the feeder house sitting in the cab, where you change the drive change to a different sprocket and it disables the variable speed drive. The book tells you to do that to put on a grain head for obvious reasons, it "locks it" in lowest speed. I've not done it, I just run it all the way to slow and unhook the hose, but I wonder if there's something similar. The wording in the book is confusing, sounds like a pain in the butt, changing chain length and such, but check it out?
 

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its also possible if the sheaves have been constantly greased in the low speed position and not cycled in a long time that the grease will not let the sheaves adjust out.my deere dealer told me this a long time ago.
 

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i agree,
even if you grease it religiously, if you don't move it from time to time, it will sieze

a quick check would be to zip off the spring on the reverser sheave, if the sheaves move, thats not your problem.
you should be able to slide them off by hand

but be careful!!
back those bolts out evenly and you shouldn't have a problem.
 

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Discussion Starter #13
Ok I got it this morning. We took the coupler off, oil came out of it, took the line off, no oil. Seems the part that goes through the bracket there has a reducer in it with a tiny pinhole for oil to go through. Has those brass rod things in front to keep crud out, evidently they weren't. I knocked that reducer out and got oil through, now it works. Have to be carefull because without that reducer it changes pretty fast, but we can manage just bumping it carefully. Got the top sheaves moved back a bit and belt adjusted so the bottom has the 1/8th gap it calls for in the book and still only 500 minimum speed. Good enough I guess, I can run it up higher now if I need in corn.
Also changed the chopper to slow as recommended. Should be all ready to go for corn now, if it will just dry out a bit more.
Thanks for the suggestions guys.
 

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I don't know your yields and terrain or header size but I would suggest running your backshaft rpm in the 550-580 range (under load) - at speeds over 4 mph it will keep from pushing stalks and will pull more trash thru. DO NOT run it at max speed like ebert said, that just wears stuff out faster. i wish i had a camera to show you pics of a row picked with a head to slow, to fast and just right, it is amazing the difference.

good luck,

jd
 

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hey now, we don't lose any more grain out of it than the "proper" setup, we just prefer to have short stalks so we bump up the speed to get the knife rolls movin.
 

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I didn't say anything about grain loss, running the FH that fast makes the reverser turn at mach 1 and the feeder chain is wizzing pretty da*n fast.

If you need stalk roll speed set the head up to run in overdrive, not run the whole thing as fast as it can go.
 

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Discussion Starter #17
jd9600guru-Right you are. I ran it right around 540-570 and it worked perfect. It did seem to creep higher after a while, or else I bumped it. That was plenty of speed though for getting the ears off in corn that was 32 moisture, doing around 5 mph, corn making around 170, 6-30 head. Can't imagine needing more speed than that, it still pitches an ear sometimes. I could have run faster but with this wet stuff I hate to risk plugging the clean grain elevator. I did first thing, had to tighten it up a bit. On downhills a couple times I got up to 5.5 before I slowed it up some, no problems. It did a nice job.

And yeah, the duals work just fine with the 6 row head. I blew another latch hole so the ladder is a little farther in and it works fine. Althoug I did find by accident that if you leave it out the corn goes between the ladder and the dual anyway.
 
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