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2388 vs 7088?

27529 Views 20 Replies 12 Participants Last post by  red7088
I have three 2388's and was considering trading up to three 7088's am I going to gain much? I thought I should gain a fair bit but heard some guys around not impressed with the 7088. I ran my 2388's with 36ft draper headers along side a 9860 with a 40ft draper in 60bu wheat and we did more acres a hour then he did? Has anyone upgraded from a 2388 to a 7088 and was it moiving up a class or not? I know the unload speed and bigger tank will be nice but I still have to gain acres a hour too.
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Are you currently limited by HP, or by the rotor/sieves?
it depends on the crop I would say 70% of the time its HP
So the same core machine with more HP would be better for you.

Think of it as a bunch of subsystems: sickle, feederhouse, rotor, cleaning, clean grain elevator, etc. You can only go up to the level where you hit the limit of any one of those systems. If you're currently hitting the HP limit, and you increase the HP, then you'll be limited by whatever is the next limiting factor. More HP means you'll drive faster, so it may be more of a challenge to get the crop through the rotor and sieves with minimal losses, since you'll be pushing more crop through the same rotor.

I am running 7088 this year vs. 2388 last year. No disappointment here.
Besides bigger bin and in cab adjustments this thing is a horse in wet 200 bu. corn.
Unloading on go is a breeze. I think you should run one to see. I 'm in Iowa your welcome to see it run w/8 row hd.
Regards Rick
Good Points

  • More horsepower
    More Electric controls
    AFX Rotor
Bad Points

  • Bigger/stronger rotor belt (Less give puts more strain on gearbox)
    Lighter manufacturing (concerned of fatigue points,eg bubble up auger
    No real match to a 7010
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So the 7010 will out perform the 7088 is that in all conditions? Is it worth the extra money to go to the 7010 or 7120? I thought it was bells and whisles mostly the differance with a 7010 vs 7088 ( hyd drive rotor different self leveling sieves no auger bed slightly wider concaves...) Wasnt sure there was capacity differance the few extra hp on the 7010 was needed to over come the inefficent hyd drive rotor?
The rotor isn't hydrostatic. Its driven by a CVT like the tractors are starting to get. It is at least as efficient as a belt, with the option of reversing it without a wrench.
I am not surprised at all that people might think that it is a hydraulic drive. I would love pull one completely apart to see exactly how it operates. It looks like it operates similar to a torque converter on a car. They might just be increasing and decreasing hydraulic pressure to allow more or less slip. The biggest way it looks to differ from a hydraulic drive is because you don't have extra loss from oil that gets by the gear on the hydraulic drive that is not directly driving the load. Many concepts are still very much in the same as a hydraulic drive, but it is a good design which eliminates a lot of the ineffeciency associated with a hydraulic drive. Many new hydraulic systems are getting very close to being a very efficient power transfer. Hydraulic drives have the potention to be much more effecient, but the original designs were very inferior.
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Not like it that all. It is very simple. It is a planetary where the ring gear is engaged to a gear driven by the engine through the ETR (engine to ring) clutch. The sun gear of the planetary is attached to the hydro motor which speed and direction controls the speed of output which is the planetary carrier. When the motor is not turning the output is 100% mechanical and the hydro motor essentially does nothing. The greater the load on the output there is there will be force trying to drive the hydro motor. When the rotor is plugged the RTF clutch (ring gear to frame) will be engaged holding the ring gear to the gearbox housing. The hydro motor now has a 4:1 ratio to rock the planetary gears for wards and back wards.
The break up of the cvt doesn't look to me like what you are describing. Maybe it is a bad picture. I don't see the ring gear on the schematic at all. I just see the little spider gears that connect to the load. Have you ever had one of these apart? It would definitely look like the planetary you are describing if there is a ring gear that the picture doesn't show. How does this thing change speeds variably? I thought I had this thing figured out, but maybe the picture is so incomplete that it is confusing me. The picture looked earily familiar to me to the pictures of the new electronically controlled torque converters that most cars use. They use fluid to make the torque converter more or less. They even use hydraulics to lock the converter completely.
It works the same way that steigerman explained it. The salesman at our local dealership showed me the service manual and the parts list for the CVT drive that they use. Its much better than any of the pictures that they have in any of the brochures that I have seen
I am running a 7088 and a 7010 for the first time this year. We ran two 2588's last year. The 7088 to me is alot more combine than our 2588 especially in corn the extra hp is nice when unloading on the go. We run a 8 row wide 36" row corn head. As for how it compares to a 7010 I have only run the two together in beans, the 7088 has a 30 foot 2062 draper and the 7010 has a 30 foot 2020 header on it. The 7088 can run about a mile an hour faster than the 7010 picking beans, really like the 2062 its our first year with it as well. Priced a 7120 equipped the same as our 7088 dealer said it was about 30k higher for the 7120, for me I don't see a 7120 doing that much more than a 7088 so we ordered another 7088 for next year.
Great explanation steigerman, thanks for clearing that up!
I'm always surprised at how many people think the rotor is hydraulically driven. I just had this discussion with a friend and found a picture that shows the shaft going across into the CVT gearbox. I think the only thing hydraulics are used for here are adjusting rotor speed.

If you're interested you can check out this link to see a picture. Page 3 of 4 and zoom in to about 200%.
You can't compare those machines unless u have a draper on both.....
red, in your comparison, were you finding that the draper just fed or cut better than the 2020, or was the limiting factor on the combine (HP/rotor/sieves)?

I have not run a 7088, but last year we had a new 2588 and a 7010.Stock the 2588 was a dog until we put a ts performance chip on it- it really made a man out of it,even though we only ran it on 15%.With the chip it would get close to staying with 7010 in good dry beans,add some mud,green stems, or tough crops like down rice or high moisture rice and the 7010 would show the difference. I know this is about a 7088 but a 2588 with 50 more horsepower is a 7088 minus the looks.
We bought 2 7088's this year and 1 7120, the 7088's have 40' 2152 headers the 7120 has a 36' honey-bee. The 7120 with the smaller header would go slightly faster in 60 bu durum, but only slightly. The 7088's were excellent with capacities averaging 1600-1700 bu/hour, maxing out at 2000 bu/hour. The Case/Macdon headers feed far better than the honey-bee also. 400 hrs. on each 7088 and only 1 small problem with electrical harness on 1 combine. The 7088's also quieter in the cab. The 7120 with rotor reverser is a valuable feature. The larger self-leveling sieves make the combine easier to set also on the 7120. As far as capacity goes I would save the money and go with the 7088.
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