Combines 8820 vibration

On both sides of the combine there are two bolts that hold the plating that the bearings for the cylinder are in. Check and make sure that those bolts on both sides are tight and not loose making the cylinder bounce up and down. I had this happen to me on a 8820 Turbo series of a college buddy's and I'm telling you when it came loose it wreaked holy havoc.

I have 7720,had real bad vibration,changed power shaft

Could be your cylinder bearings. Had similar problem problem on jd 6600.

Thanks for the ideas. I checked the bolts on the bearing holders- they were tight.

Brad.....New thought, have you recently changed the cylinder bars on this machineIJ What's the possibility that you didn't get the balanced one's across from each otherIJ One more thought now.....does this have the corn plates in between the cylinder barsIJ What's the possibility of big wads' and chunks of matter in there that throw it out of kilter just like a wheel weight in the wrong place on a rimIJ Just winging some ideas.....if there's anything I'd like to wring deere's neck over it's the sorry design of that cylinder. My old mans 860 has never beat him out of the cab from being out of balance but there was times this summer my entire steering column would shake like it was about to blow from that cylinder.....3 to 5 times engage the cylinder....wind it up.....slow it down....wind it up.....bring it to a stop....do it again and then you could bare to sit in the seat............that's at least until you cut weeds all day with it and then let it set overnite.....next day if you didn't climb on the feederhouse and scrape the hard dried weed residue off the back of the cylinder bars you could put up with it all day. No sir....I don't like that mickey mouse cylinder at all.

Brad I would check the variable speed cylinder drive belt with a set of calipers or a similar device over the length of the belt to check for a narrow spot. This can happen when the cylinder is plugged. This will cause vibration as will a severe crack in the same belt. Also you might check to see if the floating sheave on the primary countershaft has worn bushings and as a result is constantly shifting on the hub as it turns.Hope this helps

We had the same thing happen to our 8820 last week. The harder we pushed the machine the more pronounced the vibration was. It turned out that we had a narrow spot in the varible speed belt. When we ran the machine empty and it would vibrate and when we watched the varible speed belt it was vibrating badly. The belt did not have much of a flat spot to it but it was enough to cause the vibration. We replaced the belt and it works like new again.

INSTEAD OF BUYING All OF THOSE SHEAVES NEW, THERE IS A PlACE THAT YOU CAN SEND THEM and HAVE THEM RE-BUIlD, I HAVE SENT MANY OF THEM THERE and HAVE VERY GOOD lUCK WITH THEM. I CAN'T REMEMBER THE COMPANY RIGHT NOW, BRAIN FREEZE I GUESS, E-MAIl ME IF YOU ARE INTERESTED and I'll FIND OUT All THE INFO. HOPE THIS HElPS

I will check into the belt. Did you vary the speedIJ

Are you stopped when you are unloadingIJ Is this vibration when you have the seperator engagedIJ Are the tire sizes on both these combines the sameIJ What are they and what plyIJ Some stupid questions but I have an 8820 with a Bish extension and don't have any vibration problems. Does the vibration stop at any particular rpmIJ Hope this helps. Is the unloading shaft universal in good shape and greased. Are the hours about the same on both machinesIJ