Combines Rear Feed Conveyor Drive Shaft

Had a couple fail but lucky not to get into rotor belt. Hasn't been a common thing. Not a bad job to replace if familiar with replacing sprockets. Don't think we've replaced one since '99 machines so something must of changed. Don't know if it was the amount of hardening or champhering stess areas that may of made a difference. I believe sometime in '03 they went to 2" shaft so they may of still been having more problems then expected. I believe they eliminated slip clutch at that time so hopefully they don't have shaft turned down to much next to bearing. All the machines they put out with rock sump surely is stressing the heck out of that shaft ect. I think beings your shaft was partially broke for awhile means the shaft was good enough the way it was most of the time. I would suggest to run rock door hump to try keep cylinder feeding well. Maybe more important is to prevent feeder pluging thus feeder reverser operation. If poor header feeding isn't causing the plugging then you should look into lowering feed floor or perhaps posi-feed rollers. I'm starting to wonder if the feed reverser isn't to handy to decoy feeding problems. We'll see how the posi-feed roller works in rear feed without lowering the floor soon. Sure would be easier. I feel they have went ahead and made things nearly bullet proof but still need to address why they need to make it so heavy. Take care.

I just installed the sump in this machine using the fingers to help the feeding. But I suppose the load is still higher. Were you saying the new machines dont have a slip clutch on the back chainIJ And what is the posi-feed rollersIJIJIJ

We replaced the original Rear Feed Conveyor Shaft last season on our 94 R62. We have never had any problems but thought it best to play safe. It seems every body else around our area has broken at least one shaft. Years ago, we removed the chain on the feed reverser drive to the above shaft as it has rarely been needed. A lot of effort has gone into getting good feeding from front to back, although we still have some problems in some crops. We strongly suspect that the chain on the feed reverser some times sets up some sort of harmonic vibration in the pulley_slip-clutch arrangement which eventually fatigues and cracks the shaft just outside the bearing. Cheers!

How did you have trap door set up beforeIJ likely old break from year or more ago. Rock jammed in or reverser use. Unjamming with full throttle clutch engagement ect. Surely sump with finger kit is not as good as hump kit. Maybe one more finger could be used on finger kit but we just stayed with original proto design. Yes the slip clutch is removed and don't know the whole setup yet. They may have tentioned belt lighter to allow a breakaway devise (similiar to old P1s). loewen is making the posi-feed rollers for a guy in Australia. Rolf and Max have been talking about them. They are a tention drum for feed chain that is basically triangle shafed except for area chain runs on. I have a couple of loewens' proto types to test this fall. I have good feelings about the posi-feed rollers and know that the floor reposition job works. Good luck

Father_son Tag team here! Just to Reinforce Dan's comments as well that getting the Whole combine to feed and Discharge smoothly will help a lot with small things like the rear feeder shaft! we were told by the local AGCO mechanic that ours was one of only about three in Southern Australia that Hadn't broke our Rear feed shaft! I contribute that to the the fact that we had a lot of the Hyper mods on the the machine early and most importantly the Third Helical that Dan's Group came up with as this helps to relieve a bottle neck in that feeder concave area. We all so have the Concave door hump as well, and no corn stripper in front of the rear feed sprockets. lot more room for MOG to move about than before. Having no reverse bars helps as well because the rotor is getting rid of MOG faster than the feeder is putting up in there. Have a look at the feeder reveser pulley to see how much the chain has been whipping! like ROM said check to see if the pulley have been wobbling on the shaft, see if the brass bush is a firm fit or a bit loose! if loose it can wobble a bit and just might help with breaking that outside shaft off. Rolf

Well did some more research today and decided to update my rear feed shaft to the new style that is currently being used on the R75s. It will cost about 638.00 bucks but I will have a 2 inch shaft and I wont mind losing the rear slip clutch to gain maximum strength in that shaft so I wont have to go through this again. looks like I have enough straw on the shop floor to make a round bale, took awhile to get that all dug out so that I could find the connector links for the feeder chain. Pulled the rotor then got out the sawzall and cut the shaft since the bearings weren't going to move and the torch wasn't an option do to the flamabiles located in the feederhouse, then had to get the die grinder and score the bearing races so that I could fracture them with the air hammer. Once that was done the shaft came out nice and easy. Now I just have to wait for the parts since I decided to do the stock order thing since I dont need the machine til bean harvest so next week we should have her back in shape again.