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West Central Missouri | When I had a 7720, had upper sheaves apart because of different noise due to worn pulleys, and JD mechanic said to replace the bearings while I had it apart -- big source of combine fires. No problems after that.
Currently have a 9510 and replaced upper sheave bearings before 22 soybean harvest because bearings were whining while finishing corn, first time have had that apart on this combine. When I took it apart, outer bearing obviously not good, "teeth" inside the pulley were also badly worn with cavity full of metal shavings, very little grease inside, and were 2 big seals for some reason (both loose). Ended up replacing both bearings, the inside part that bolts from the inside of the inside pulley, the outside pulley and a new seal. Found a decent JD video for instructions to follow at the time, followed those instructions step by step, and were good instructions for properly tightening the belts. Didn't have any problems cutting beans in 22, and whining noise from bad bearing(s) gone.
When you cut beans, you're at slowest speed on variable speed, with hydraulic hose disconnected from variable speed drive. When I pulled into 23 corn, shelled about half a hopper and had trouble maintaining header speed where I wanted. Stopped and opened shields to check it out, grease came out between pulley sections beneath header drive belt which totally slimed my belt. Took upper sheaves apart again, the seal had blown out. Replaced seal and filled with grease as instructed and replaced drive belt -- then it happened again, but I had not installed left shield so I could watch it so caught it right away. Went and talked to JD shop foreman -- instructional video I used says to fill cavity with grease, step by step instructions the shop foreman pulled up on his computer don't say to do that, shop guy said just to coat inside with grease. So, roughly scooped out the extra grease (just wiped it out with a corn cob and left less than 1/4 of it), got another new seal and installed where it goes, left blown seal loose on outer pulley as I slid it in as additional protection and as a spacer to limit top speed (outer sheave can't close as far, which is fine, top speed is quite a bit faster than I've ever used anyway), cleaned up the drive belt, and so far seems to be working fine.
Bottom line -- replace both bearings while you're there, check inside teeth/splines for wear in case need to replace, use gasket sealer or something when you bolt on inside cover before installing inner pulley, put in new big seal and use some gasket sealer or something to help hold it there, and (in my opinion) don't "fill" cavity with grease (if you push outer sheave all the way in and it's full of grease, then that's definitely too much grease, take some out before putting in outside bearing) and maybe even use old seal as a spacer so sheaves can't close all the way like I did (and apparently the guy before me did the same for probably the same reasons), and make sure you line up the teeth/splines correctly (inside has double splines opposite each other, outside piece has single splines opposite each other that go between the narrow openings of the double sets). | |
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Jd 9600 feeder house noise
