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Discussion Starter #1
We have never ran a STS machine before. We traded our 9610's on a 9870. We will probably be pushing it quite hard. My question is, what is going to happen when you throw the additional horsepower to the 70 series while all the threshing dimensions are the same as on the 60 series? Does anyone know what is the weak link in the STS? Rotor belts, concaves, concave actuators, feed accelerator, what about the feederhouse slip clutch, will it keep you from overloading the threshing system. We will be running a macdon fd 70 up front in wheat, milo, and soybeans. And by the way, I fully understand the john deere is limited by it's cleaning capacity.
 

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I believe they went to what used to be the 9860 rotor belt on all the 70 series? I know it's pretty heavy, I would have to say the first thing to plus would be the feederhouse, it will usually stop before anything else in wheat, in milo I would say it is the rotor belt... soy's I cannot really comment. In green wheat straw the chopper on the 60's would plug but that was HEAVY GREEN straw.

Hope this helps.
 

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Quote: The feed acc will plug and smoke the belt easly in damp conditions in beans and wheat

We had the same exact problem on the 9650 and 9750 we ran. Glad to see Deere is being proactive and getting that feed accelerator problem fixed... 3 whole series' of STS's and they still have the same dinky problem. Throwing 440 horses at it must fix everything right???
 

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Quote: The feed acc will plug and smoke the belt easly in damp conditions in beans and wheat
This is gonna sound funny, but it took me 8 years and 2000 header hours but I can no longer say I haven't!

Don
 

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Quote:I believe they went to what used to be the 9860 rotor belt on all the 70 series?In green wheat straw the chopper on the 60's would plug but that was HEAVY GREEN straw.
My 9860 just going through the shop, 850 hours on rotor belt, finally starting to show cracks between the lugs, should last 1 more season for me or someone.
The chopper drive is excellent and 70 series is even heavier.
I do have one seemingly unsolvable problem but I'll start a new thread
HARVESTSMART-IS YOUR DANGEROUS?
That otta get attention.

Don
 

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JD have 530 hp in the 9880/S690/9870 for European conditions. Not heard of any problems yet but going on what you guys say I am thinking of buying shares in the belt manufacturing company.
 

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Discussion Starter #8
What happens to the concaves when a big slug happens to make it through? On a 9610 the concave actuator was the weak link.
 

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Quote:I went through 11 accelerator belts this year on our 2 9660's. Brought in a 9850 for a couple days and it handled the green, wet canola straw better and no belts burning. I think the extra power maybe just let it spit through. Our feederhouse and pickup header will restrict us in a lot of cases. traded for 2 9770's for next year so I'm hoping the extra power will be a benefit.
Do you mean a 9870 not 9850?
Um...er, not kidding, first time and only once was this year! Got lucky with wind direction saved the belt. I went through a whole year once in low speed position with out knowing it. Do you run tough threshing option as I do? That's all I can think of and sorry but all more power will do, if used, is make it worse, everything else being equal.
Let see 2000 hr X 12 ac/hr X 11 belts= 264,000 acres at the same ratio I plug. Safe to say you fell short of that this year?
Puzzlement.

Don
 

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Typically you won't have any concave issues unless you put a rock through it. Although you may need to keep a spare unloading auger eyelet that goes on the end of the swing out cylinder. We have a lot of those break. Chopper belts and Variable speed FH belts as well, Upper and Lower. As long as you don't pull the machine down below 2150 engine rpm's you should be fine. With the chopper you may pull the knives half way out or all the way out to save on power fuel and breaking/smoking belts. Rain caps fall of constantly, and the moisture sensors get moisture in them and break.
 

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Quote:I went through 11 accelerator belts this year on our 2 9660's. Brought in a 9850 for a couple days and it handled the green, wet canola straw better and no belts burning. I think the extra power maybe just let it spit through. Our feederhouse and pickup header will restrict us in a lot of cases. traded for 2 9770's for next year so I'm hoping the extra power will be a benefit.

Is that a 9750STS Canadian combine, it will have the bigger engine.
 

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Sorry for the wrong model number but it was a used 9860 sts. 2years old I believe. I was impressed with our 9660's running along side of the 9860 but horsepower ruled this year in our conditions. I don't know what our belt problem is but accelerator belts is something we fly through. Never changed a rotor belt. My feederhouse is on high chain speed as thats where I always put it for the Macdons.

Never heard of the tough threshing option but will sure find out.
 

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Quote:What happens to the concaves when a big slug happens to make it through? On a 9610 the concave actuator was the weak link.
I find it breaks the roll pin, or gears, or motor that adjust the concaves as well. Have heard of the concave hanger bolts breaking but personally never have done it.
 

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I have had feed accelerator problems in the past and it took 3 years to figure out what was wrong. Some models have a High Capacity Feeding package which includes serrated wear strips and that makes all the difference. We had 2 9860 with the high capacity and 1 without and that single combine burned up 6-8 belts in one season, the other two not a single one. This is not something that the JD service tech or salesmen have been aware of, in my area. I have compared experiences with the neighbors and they all agree. The 50 series however has a lesser drive compared to the 60/70s. The choppers have been improved on the 70s as well as the unload auger drives, 2 of the things we have had problems with on 9860s.
 

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Quote:What happens to the concaves when a big slug happens to make it through? On a 9610 the concave actuator was the weak link.
On a CR 9070 you break a bolt, intended for that purpose, on 05 9860 broke the right rear concave hanger, now heavier, on a 590R a hydraulic accumulator allows concave moment, maybe a 9870 just plugs but by my experience that is extremely rare.

Don
 

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I went through 11 accelerator belts this year on our 2 9660's. Brought in a 9850 for a couple days and it handled the green, wet canola straw better and no belts burning. I think the extra power maybe just let it spit through. Our feederhouse and pickup header will restrict us in a lot of cases. traded for 2 9770's for next year so I'm hoping the extra power will be a benefit.
 

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Yes I have always ordered the high capacity accelerator. Serrated strips are on there and a different belt. Overtightening the belt helped this year but for some reason I"m the only one with this problem. ( Sounds Familiar)

Looks like I almost hijacked Binbusters thread but on that used 9860 that helped us out, on his own crop it did burn up a rotor belt this fall at $1000 bucks. He didn't smoke any accelerator belts though. So I get 4 accelerator belts for the price of his rotor belt.
Also If I had more power this fall I could have increased my speed and capacity about 40% of the time.
More Power? Bring it on


Binbuster you won't use all the power up all the time but when you need it you'll be glad you have it.
Mud, unload on the go, hills, green straw, If you have some or all of these conditions you'll want the extra power.
 

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Discussion Starter #18
Hey Glensts, I'm all ears! I'm still learning about the sts. Hijack away!

I'm happy to know that someone with experience with a 9860 feels the extra power is necessary. The dealer was trying to talk us out of the 9870 and refer us to the 9770. Yes we do have hills, extremely tough conditions and will be unloading on the go alot. Thanks.
 

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I agree, the power of a 9870 is worth it. My farm just traded up to 4 9870s and I have heard alot of people ask why not 9770? My neighbors burnt up 3 or 4 rotor belts on their 9760 with the smaller rotor drives.
 

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Quote:Yes I have always ordered the high capacity accelerator. Serrated strips are on there and a different belt.
Glensts
I Think we might need knowledgeable salesman's help here, but I'll try.
For this discussion we are only talking the feed accelerator on small grain combines.
1.Old standard=Wide serrated lugs, speed 440/880
2.High capacity=Wide serrated lugs, speed 500/1000
3.Tough threshing=1/2 width lugs but twice as many, staggered, speed 500/1000
There was also smooth lugs and slow speed drive which this thread needs about as bad as you need aids.
I SWAGed the old speeds but I think there about right. SWAG? Scientific Wild Assed Guess.
So what about 08's?
While, there's no mention of anything except a slow speed drive on JD's build your own site. Sorry couldn't successfully link.
So it appears my #3 is now standard on small grain combines. They also play around with feeder chain speeds but that's not what does/does not plug the feed accelerator.
Anyone any wiser?
I can't believe I've had so little trouble with the FA.
My dad would say you guys "baby" it too much.

Don
 
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