Combines 7720 Turbo

[Winst]

If those are actual hours, I would look at concave, bars, augers. That isn't enough hours that the tin would be worn out yet but enough that there could be quite a bit of expense if not kept up. As far as capacity, it wouldn't be close to either the N6 or N7, probably bigger than an l2 but not too much. They are way more reliable than the N series, or at least I think they are.

 

[WTX21]

As far as capacity and speed and bin capacity go, I am not real worried about it. Mainly the reliability and ability to get the grain from the field to the bin without loss and heads and stems with the cleaned grain, without breaking down,or tearing its self up every 10hrs. Overall the machine looks like it has the hours shown on the meter. Good belts, bearings, engine, augers, chains and header. looks like someone shedded it every year. Is $15,000 pretty high for an 80' 7720 with 1500 hrs. 24' nice looking header. Not a lot of wear and tear on the outside for a 24 year old machine. What could I expect as far as preformance from a well maintained 7720, seed loss, grain sampleIJ

 

[newguy]

Hydro or posi-torqIJ If posi-torq you should ask about the bushings on those shafts. The variable speed cylinder either has bushings or bearings, can't remember for sure, but that's another consideration. The return auger has an updated kit. Above the concave where it drops the tailings, it had a wooden block on the end of the shaft, the kit has a bearing. Below the feeder house the tailings augers are driven by a shaft with bevel gears. Check that those are tight and hopefully the keyways aren't worn. Elevator and feeder chains and sprockets. This is what we did to our '86 with 1900hrs.

 

[Winst]

I think you would be happy with the job it does. It also has pretty good capacity, but not like the rotary Gleaners. My experience with JD combines is that they are pretty reliable. My only gripe is they are hard to work on compared to a Gleaner. I have an 8820 and some things are nearly impossible to get to. The 7720 is better, 6620 better yet as far as working on because there is more room between the separator housing and the tires.. That does sound plenty high for a 7720, but you are getting a head too, probably worth quite a bit and it is extremely hard to find a combine that age with the hours you state. If you look what the old 9500s cost, probably be a fair deal.

 

[KS7Runner]

I have both a 7720 and N7. I use the 7720 in wheat and soybeans and the 7 in corn and sunflowers. Both machines have their good and bad points. Capacity wise the 7 is the winner but they are two different class machines. I am happy with both machines. The 7 has 6500 sep. hours and the 7720 has 3900 engine hours. The bars, concave, sprockets on the feeder chain and the grain elevators, shoe bushings, walkers and blocks, chopper knives and the chopper bottom are a few things. Check the primary countershaft to see if it is straight along with the engine PTO shaft under the seat. The hydraulic pump will wiggle if the PTO shaft is bent. If it has set outside alot you might want to look at the fountain auger gearbox. Good luck on whatever you do.

 

[TSTAR]

You mentioned, "Check the primary countershaft to see if it is straight along with the engine PTO shaft under the seat". Is this in reference to the big 3-rib belt that drives the separator unitIJ If it is I am having trouble keeping this belt on. I have a 8820 TURBO. The belt tends to "walk off" when I engage the separator and it smokes everytime If I am lucky. Normally it chews the belt up. If you can help in this department let me know what to do.