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| Other than the poly snouts is their much difference between a 643 and 693 been thinking about just putting poly on my 643 corn head thanks for your inputs. |
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North West IA/western AZ | Oil drive is the only difference I know and some of the later 643's had that. |
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CIL | Lot of factors here to consider. What combine is it on and what combine might this head go on when you upgrade combines? Do you already have pto shafts (contour master)? How about hydraulic deck plates? |
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| We had an old 643 and updated it with poly and hyd deck plates. Always thought it worked good. Only reason we got rid of it was we went to 8 rows. Ours was an early hi tin. |
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| Mine has low tin with the oil bath and in pretty decent shape |
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Morris, IL | Cluster gear in gear box on some x93 heads was stronger, would hold up to knife rolls better. I think 1998 was cutoff there not sure tho. Poly is nice, have a late 643 with poly, knife rolls, oil bath, it’s a nice head wish I had calmer knife rolls tho.
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CIL | NEILFarmer - 3/17/2018 15:38
Cluster gear in gear box on some x93 heads was stronger, would hold up to knife rolls better. I think 1998 was cutoff there not sure tho. Poly is nice, have a late 643 with poly, knife rolls, oil bath, it’s a nice head wish I had calmer knife rolls tho.
+1... getting the benefit from the cluster gears depends on what rolls will be on the head. Plus the couple grand for new poly is halfway towards a decent 693 with hydraulic deck plates, pto drive shafts and single point hookup. Also depends on what combine the op wants to run it on.
Ty’s lucky since he got a great deal on used poly! |
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west cent ohio | When did the angles change? No need for the wedge kit. |
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Illinois | NEILFarmer - 3/17/2018 15:38
Cluster gear in gear box on some x93 heads was stronger, would hold up to knife rolls better. I think 1998 was cutoff there not sure tho. Poly is nice, have a late 643 with poly, knife rolls, oil bath, it’s a nice head wish I had calmer knife rolls tho.
Fwiw I have heard that the blue tinted poly is the older heads with the weaker cluster gears. |
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| Yes unfortunately I can confirm that. 
New fused style on the left an older welded style on the right. 
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Floyd County, Iowa | Von-
What stalk stompers are you running?
I have a 643, and I think I want stompers.
BTW- the tool for the spiral wrap didn't work as intended. |
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Morris, IL | I thought it was other way around Von, welded being newer?
I think blue poly was 1996 and older. Same color can be seen in bean head end dividers. I’m unsure if combines same age did same thing like under the cab and cab roof?
I’ve heard different years, I don’t think just because newer green poly means heavier cluster gear but I think that is ball park. |
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sw corner ia. | there is zero difference in strength between early and late cluster gears. the difference for deere is it is cheaper to press them together instead of weld them.
I have broken both.
Edited by dvswia 3/17/2018 20:25
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Tx | NEILFarmer, what type of header height sensing are you using on the 20 series? |
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| I was told from someone directly at Deere Harvester works that the new ones were assembled with melt rings and fused in a furnace and that was supposed to make them stronger than the older welded versions ? Nobody seems to know the exact serial number break when the updated gears started from the factory but I know they were available through whole goods by Feb of 1998. Dave has seen both styles fail but I wonder if this is directly correlated to the machines being used to drive them and how hard and fast they are being ran ? |
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sw corner ia. | von.. corn usually averages 180+, head drive gears are running 1-1. I run the backshaft at around 600 rpm. ground speed between 3.5 to 4.3. any faster and my wife (who is the trucker) will refuse kitchen functions. this is not what anyone could call abusive treatment to the head. I do have clarke machine knife conversions, which are wonderful. btw.. this head was built in 1980.. think about that.
I have replaced I think 5 rows of these so far and one was done twice, which was the new pressed together gear that failed. it looked like the two gears just decided to part company on happy terms. I think I could have welded them back together and would have if I hadn't had a couple of these on the shelf.
these gears should be cut out of a billet, can't get anyone interested in doing it so there you go.
I will say this is really not much more than an inconvenience because they are not hard to change at all and this head has all it's original bearings which still are tight. I have no need of a wildly more expensive head to get my corn in the bin.
Edited by dvswia 3/18/2018 08:31
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| Did not mean to imply you were abusing your head. Just wondering how the drive torque compares from a later 00 series vs older 20 series. I run pretty much the same scenario of conditions as you although a little slower on ground speed. I agree one piece billet would be ideal and there is probably a market for them if some one makes them. I converted a 443 to updated gears/knife rolls in 98, ran 1 year on 4420 before switching to 6620. I ran it until I got the 693 in 2013. Had no issues with updated gears in that time frame. 1 gearbox of the 693 was replaced due to a fracture in the housing where the top drive sprocket exits. That is when I identified these were not the updated gears. The other 5 rows are still running with the older gears but I am mindful of that potential weak point and try to not crowd or abuse things. I have seen others mention of running a 6 row on a 9600 and having to run pretty fast ground speeds to keep the machine full. I would guess that would be running at or beyond the design specs of what the early 643 were designed to handle. I agree these are quite durable heads and probably many out there running way beyond what was originally considered the usable lifetime. Also agree see no need to upgrade to more expensive unit. |
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sw corner ia. | that's ok, Von, I know you didn't mean that. I was just relating how I use it. I probably do push it slightly harder than with my old 6620sh, but it would produce enough corn per hour to keep everything full anyhow. only reason I have this 9500sh now is because the old one had 5000 hrs on it and the newer one had 1. looking back I can see I should have done this trade many years ago, but the cost was just too high then. |
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643 John Deere corn head
