Combines 6620 vs 1640

We had a 1980 6620 that was one heck of a machine. When we got it from the dealer in 97, it needed some work, a few belts, a couple new bearings, new elevator chains and a new tailings auger, but overall it looked pretty good. We put about $1000 into it and really never had to touch it again after that for three years, running corn, beans and wheat. We sold it last year, moved up to 9500 due to time and size. That 6620 would handle an 18' flex head in 60 bushel beans at 3mph, and the 6 row corn head in 185 bushel corn at 2.5 mph, nothing to race with, but it got the job done and really left a nice clean sample. There are times when I wish I had that thing back, like when trying to find somewhere to park the 9500IJIJ Any questions on functionality and maintenance, let me know. Farny

I am looking at buying a 6620, what are the main wear points to look for on this machineIJ I am currently running a 4400.

The main guts and wear points on the 6620 are about the same as your 4400, not a whole lot of changes made to them, just updates, more convenience things, and bigger! Check the rubber bushings in all of the cam arms and supports for the chaffer and sieve, lots of em and not too hard to replace, a little vaseline and some pressure and no problem. The rear axle can break around where the adjustable axle slides in and out of the tube or near the center at the pivot point, try and find a heavy duty rear axle or 4wd. Never had any motor trouble, or any hydraulic trouble. Pretty much just your basic wear on a combine, won't be much different than your 4400.

Thanks for the info. Deere should have beefed up those axles. The one on my 4400 broke at both ends. They should have built them like they made tractor front axles. I remember when we got a loader to put on our 3020 back in the 70s, dad asked the Deere dealer if the front axle could handle loader work. The dealer replied "If you can break the axle on that 3020 I will replace it free of charge." That was more than 20 years ago, and the axle has never broken.