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Tractor Talk Discussion Forum

John deere 6620 combine

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Reid1650

09-05-2011 22:04:58
96.29.160.20



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This will be my first year running my own grain. I have a 216 grain head and a 643 corn head. Both are very very nice. Id like any wisdom you guys have about harvesting, running this combine, or anything you can think of. Thanks guys




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brian(MN)

09-06-2011 19:11:59
70.41.88.107



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
I ran a 6620 for 10 years. It is a decent machine but we had to repair alot. Finally gave up and bought a used 9500. Made that 6620 look like the threshing machine. We had many of the same problems mentioned here! What was the last straw was the counter shaft bearing behind the big pully. I collar came loose and the shaft turned inside the bearing. Of course you can't see any of this. Eventially the combine would shake at certain RPMs. And about the same time I left the fuel cap off.... It was towards the end of corn so we rented a 9500 to finish up. Next year we parked the 6620, sold the engine to a guy to put in his tractor, sold the chopper and some other parts, still have some good parts there.
Still using the same corn head, 643, only have had to replace chains and lower sproket/bearings.

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Banditfarmer

09-06-2011 17:06:09
174.103.156.49



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
I am guessing you just got it, So I think its a good time to puller into the shop and start checking things out. Take your time and get the book out and read and look at things like settings, How to adjust things and check for worn out parts and bearings. Clean the engine compartment out and up good! Sit in the cab and learn all the controls and there settings and get the book out for the auto header controls and settings. When you get her in the field go slow at first till you will get the feal for it and get comfortable you will get the hang of it. The biggests thing is to read the book, Its full of information thats good to know. Bandit

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DC3puller

09-06-2011 16:52:50
66.116.5.234



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
Put 3500 hours on a 6620 make a great 4 row machine with todays hybrids you need to watch the slopes grain runs to one side and out the back also keep an eye on your top boot on the clean grain for wearing a hole and loosing grain the titan 2s had more capacity and hp



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Mike Aylward

09-06-2011 06:25:03
216.145.134.145



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
Reid, the 6620 will handle 6 rows of corn just fine. The main reason many had so-called limited chaffer capacity was because of overloading the clean grain elevator which was in turn caused by the fountain auger in the tank not carrying the corn away from the elevator fast enough. This is probably the most important auger in the whole combine. You want to keep this auger in the best shape you can. You want to look inside the top elevator boot to see the condition of this auger THERE, not at the outlet of the auger. This auger can be increased in capacity by installing a double set of flighting on the bottom foot or so. The 7720's added this later but I don't believe the 6620's ever did. In corn you will want the chaffer open quite a ways and then run LOTS of air in corn. With everything on the "downwind" side of the chaffer in good condition you should have no problems in high yielding corn. I've done 200 bushel plus corn at over 4 mph with four rows on a 4400 many a time and saved it. I'm not saying you can "speed" with a 6620 but with proper adjustment they will take corn faster than 2 mph with 6 rows. Mike

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Billy NY

09-06-2011 05:49:37
74.67.3.54



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
I will repeat what the guy below me said, do not overlook that fitting, it is a costly mistake waiting to happen. Apparently, easy to forget, I've heard stories of others doing the same. Had it not been for the fire extinguisher, could have been a lot worse, good example as to why lubing one of these correctly is important, that and keeping a watchful eye.



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jimmyjoe

09-06-2011 05:25:36
50.33.42.74



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
Under the seat, inside the big pulley there is a grease zerk that needs grease........How do I know?



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Fixerupper

09-06-2011 04:34:42
80.95.130.149



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
The 643 corn head is simple to use and work on. It can be rebuilt over an again with readily available parts. The atermarket has many of the parts available. The gear boxes can be overhauled by almost anyone. Jim



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JDseller

09-06-2011 02:29:40
208.126.196.144



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
In good corn, 180-200 bu., You will be pushing the capacity of that JD 6620. Really pushing if you have any slopes and or high moisture. The JD 6620 was a perfect 4 x 38 machine but 6 x 30 will make you run out of chaffer capacity on slopes and straw walker area in heavy fodder corn. In really good corn 2-2.5 mph may be all you will get out of this machine but that is still going to give you good bushels per hour.

The JD 216 bean head will be no trouble. Many run JD 220 head without issues in soybeans.

Now don't think I am running down a JD 6620. They are a great smaller farmer combine. Good cabs and simple to work on. Parts are readily available, many after market too. So the costs are held down some what. So enjoy your harvest.

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massey 333

09-06-2011 05:51:54
216.255.60.185



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 Re: John deere 6620 combine in reply to JDseller, 09-06-2011 02:29:40  
He didn't say which 6620 he has,but there were a fair number of Turbo Titan IIs running 8-30 and 25 ft.heads back in the day.Some running 2000A + a year.You are right in that they don't like Hi Moisture corn(35-45%)and mine didn't like foxtail.A lot also depended on how they were ordered with single or dual drives.



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Mike Aylward

09-06-2011 06:34:06
216.145.134.145



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 Re: John deere 6620 combine in reply to massey 333, 09-06-2011 05:51:54  
I used to own a 7720 and once shelled some 37% corn with it and got along fine. It can be done. Mike



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massey 333

09-06-2011 06:52:49
216.255.60.185



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 Re: John deere 6620 combine in reply to Mike Aylward, 09-06-2011 06:34:06  
I know it can be done,but compared to the 9000 they are lacking.About 15 yrs.ago we(A LOT) had to take off 40-45% corn(in Dec.) and the diff.really showed up.



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Mike Aylward

09-06-2011 09:56:04
216.145.134.145



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 Re: John deere 6620 combine in reply to massey 333, 09-06-2011 06:52:49  
Of course. I have a 9500 and it is about a size and a half bigger than a 6620 for a 6-row machine. But a 6620 can be made to take in 6 rows of corn without any problem. It's all in the care and adjustments. Mike



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Deere Scotty

09-05-2011 23:25:08
68.57.255.164



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 Re: John deere 6620 combine in reply to Reid1650, 09-05-2011 22:04:58  
Just keep your eyes on the headers! If you are likely to tear anything up it will probably be a corn snout, or a sickle, & guards.



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