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Discussion Starter #1
has any one run a 9670sts on a john deere 12row chopping corn head, i gotta know if it will handle it or not. THANK U

I know i keep asking but i gotta know if we bought the right size combine or not
 

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Re: Has anyone here ran a 9670sts with a 612c chop

I am gonna say you're gonna run short on power as well as tear up the reverser. The 9870 seems to be almost too small for the chopping version. There is a reason they add another 40HP when it senses the 612C Stalkmaster is hooked up.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

How fast do you want to go? Will it work, yes. What is your grain handling capacity? I'd say 3-4 mph in 185 bushels corn will be your range. Can you chip the combine? I've seen 9770 with 12 row chopping heads and they don't have a problem.

It would not worry me. The slower you drive the better chopping it will do also.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

Not a chance! Unless the 9670's reverser gear box is putting out 140 - 150 hp to run the head, all you're going to do is blow it up, because it sure as heck isn't stout enough to handle that much load. As mentioned above, there is a reason it takes an additional 40hp, not too mention the HD 5 speed powershift feederhouse drive to run a 12 row chopping corn head. A chopping corn head takes 12-13hp/row to run. You're not just driving 12 row unit gear boxes, the chopper adds another 12 (24 total) that you have to run. You'll smoke anything less than that HD PS drive.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

Yes it can work. Hope you have the High Torque Variable Speed Feederhouse Drive.


High horsepower requirements, high yielding crop, chopping cornheads, tough green corn stalks along with improper sheave gap adjustments and improper maintenance can lead to both of the complaints above.


Guide For Improving Feeder House Variable Drive Performance

There are three basic types of Feederhouse Variable Drives still in production today: the Standard Variable drive, the Heavy Duty Variable drive and the High Torque Variable drive.

Standard Variable

The Standard Variable has no oil cooler, a single belt at the electric clutch, and the back of the feeder house belt is smooth, and it is mostly on smaller and older combines. This was the only drive on 10 Series and earlier.

Heavy Duty Variable

The Heavy Duty Variable has an oil cooler, a double belt at the electric clutch, and the back of the feederhouse belt has small cogs. This drive started production with 50 Series. The return oil hose is the indication of the High Capacity Drive. see graphic

High Torque Variable

The High Torque Variable drive also has an oil cooler, a double belt at the electric clutch, but the top of the variable drive belt has large cogs like on the bottom. The gearbox is much larger, and the sheave is locked on with a large nut. This drive started production during 60 Series in 2006. (715100 - ).

Proper lubrication of the cams is one of the most important things you can do to ensure the feederhouse drive is working properly. The Operator's Manual recommendation is: When operating in severe conditions or high yielding corn, grease each fitting 3 - 5 pumps every 10 hours.

IMPORTANT: After greasing, cycle the variable from low to high speed a few times to distribute the grease inside the gearcase.

Note: Run the feederhouse variable to high speed, (sheaves apart). In this position the cam cavity will be the smallest, Caution: Greasing with sheaves together (low speed-larger cam cavity) could cause the seal to be blown out. With sheave turned so zerks are in the 12 o'clock and 2 o'clock positions see 5877.jpg, the zerk at 12 o'clock provides grease to the cam cavity, and the zerk at 2 o'clock provides grease to the inner cam surface and grease seal. The zerk at 12 o'clock can take additional grease (5-8 pumps every ten hours). Grease will purge out under the tension spring. Use TY6341 or TY25744 Greases Only. Other types of grease will dry out and become hard making them ineffective. Grease at least once a day (more if yield is above 200 bu/ac) with TY6341 or TY25744. Cycle the variable each time after greasing.

Note: Discourage from using less expensive or other types of grease. TY6341 and TY25744 greases are the only approved greases for the variable drive system. If any other type of grease (other than TY6341 and TY25744) have been used: Disassemble the cams, clean out all evidence of whatever type of grease that is currently there and start over using TY6341 or TY25744. Inspect the cams for rust, burrs and for galling. This is usually caused by the lack of lubrication. Replace as required.

Inspect outer , upper variable sheave, If it is black from heat the upper sheaves must be realigned making sure they are parallel with the Feeder House side sheet.

Check to ensure that the backshaft speed range is 520 to 780 rpm with no load at high idle. If there is more than a 20-rpm difference in either the high or low speed, readjustment is required. Run the variable to slow speed 520 rpm, stop the machine and measure the sheave gap. It MUST be 1/8" (3mm). If the gap is more than 1/16" off, readjustment is required. Sheave gap must be maintained at 1/8" ± 1/16” (3mm). see graphic

IMPORTANT: Move the upper variable to the rear as much as possible to obtain the sheave gap. This method will allow the idler pulley to be as low as possible thereby providing maximum belt wrap while still maintaining the 3MM sheave gap. See OM for the details.


During harvest, run the backshaft at a faster speed. Running faster backshaft speed reduces the torque loads, which results in lower heat levels, which can cause less belt slippage. This also increases the torque sensing efficiency for the belt drive resulting in less belt slippage and more heat transfer. This may require slowing the corn head down to under drive or the 1:1 drive ratio in order to maintain desired ground speed.



Oil: Testing has shown that there is some benefit from using synthetic oil. These oils will run a few degrees cooler, but the difference is insignificant. The major advantage is that they will not break down as fast as conventional oil in heavy load conditions. Synthetic oil will run longer and hotter without turning black from oxidation. A second major benefit of using synthetic oil is it will have less change in viscosity in cold weather, enabling the oil cooler pump to circulate oil more efficiently. If you choose to install synthetic oil in the feederhouse reverser, John Deere currently offers synthetic oil, TY26408. Starting with 70 Series combines, all feederhouse reverser gearboxes are factory filled with synthetic gear oil in place of 80W90. This oil can be used in reverser gearboxes on 60 Series and prior models.

The reverser gearcase oil capacity is: listed in the Operator’s Manual. Because of heat generated from the variable sheaves, the amount of airflow over the cooler, ambient temperature, various sizes of headers and crop conditions, the effectiveness of the cooler can vary greatly.

Note: In some cases the addition of a second cooler has resulted in satisfactory operation.

Note: Mixing of greater then one cup of synthetic oil, TY26408, and 80W90 is not recommended. If the 80W90 oil has been drained for service, you can refill with TY26408 without having to flush the gearcase. Also make sure to drain the cooler and lines before refilling with synthetic.

Grease: John Deere offers TY25744 John Deere Extreme Duty Synthetic Grease.

This grease is Non-toxic, food grade, and biodegradable. It is translucent white in color. It has an operating temperature range of -45 deg. F to +450 deg. F. The grease thickener is fumed silica which is a synthetic thickener. The lubricating media of the grease is a combination of synthetic oil and PTFE (Teflon) particles held in suspension. The Extreme Pressure test performance of TY25744 is 80% of that for TY6341, however the load wear index (which defines the overall EP performance) for TY25744 is 180% that of TY6341. Our conclusion from this is that the EP performance of TY25744 is as good as or better than that for TY6341.

Compatibility testing has shown that TY25744 can be used as relube for a unit already filled with TY6341 without concern of any serious consequences.

Based on the above information our conclusion is that for this application TY25744 is as good as or better than TY6341 in the torque sensing feeder house drive application. We would recommend it to customers running with high feeder house drive load levels as providing a potential improvement in performance of the variable belt drive. We recommend following the 10hr lube interval with 2 to 3 pumps for each zerk on the torque sensing unit.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

Is their a difference between the 9770 and 9670 reverser on the 2008 models? Know of a 9770 that had a 12 row and didn't have any problems.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

Tom, I don't doubt that the high torque won't work, but I do doubt that most are going to follow the directions you posted above. Once they get comfortable running a 12 row chopping corn head at 3 mph, they will start pushing it and it will likely be when the corn is dry and that is when it takes the most power to cut (anything can hack through green corn). If that is the same feederhouse drive used on 9860's, then likely there will be some issues come about sep. hour 100. After about two of those VS FH drive belts go, so goes the reverser gearbox. My Deere mechanic (when out working on my greene sprayer) eye-balls the FH drive on my Lexion 585 everytime he sees it wishing his could be that simple on the sts and even admits that it is still the weak link on the sts.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

The 9670sts can be orders two ways, h-duty and high torque, also you can order a 9670sts with a 8rw. option, small axles , standard lift cyl.s, this wouldn't work period. However they can be ordered 12rw. ready with two reverser options, one being the same as 8rw. called a h-duty , this would be a no go for sure , even though the combine has heavy duty lift cyl.s and hi capacity hyds.The other way would be to equip.the machine with hi-torque feederhouse, extra h-duty lift cyl's, these would be the double hose version not single hose, then you set up the variable drive feederhouse with alt. adjustment,[the only way it will work] how ever i agree with Muddy, once the customer gets used to driving 2.5-4 mph, the operator will look for more speed, two things will happen, low power or burnt variable belt. Another option would be to swap out variable drive on the hi-torque and install a fixed drive, then use a different sprocket comb. to speed up header. The last of the idea's would be the safest bet.Her is another thought about horse power, true you can chip a 9670sts and get about the same power as a 9770sts, but there is one more issue , a chip will cause xtra fuel which causes xtra smoke, all these machines run a cooled egr. system, tier 3 design, point is you will damage the egr. cooler with a chip , faster that a stock calibrated 9770sts engine,food for thought, I personnally wouldn't consider a 9670sts on a 612c chopping c.h. buy a 9770sts with the 5 speed power shift you will be happy with that machine. This opinion is based on field experience, and a full time job at a dealership, hope this helps Deerefever
 

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Re: Has anyone here ran a 9670sts with a 612c chop

No it will not. Would you run a 40' head on a 9670? Yes you can but you would be overloading the machine. So why even think that you could run a 12 row corn head on it?
 

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Discussion Starter #10
Re: Has anyone here ran a 9670sts with a 612c chop

HI Everyone talked to my Jd guys and im sticking with the 9670, they see no reason why it won't work, got the hi torque drive, hvd lift cylinders exc... and if we run out of power a little we'll chip it, we chipped our 9650 with a bully dog chip and never experianced any misshaps from it.
 

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Re: Has anyone here ran a 9670sts with a 612c chop

Tier III motors are more sensitive than the Tier II motors were as far as electronics go, but let us know how it turns out.
 

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Discussion Starter #13
Re: Has anyone here ran a 9670sts with a 612c chop

I"ll let u guys know how it turns out, im pretty optimistic about it.
 
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