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During wheat harvest we broke the chaffer due to being a rookie operator and bushings wearing out. Took the machine to dealer and told them to replace all bushings and anything that needed replacing. I posted things about it back then too...Now we have cut all our early beans and started on the double crop beans. Some of the bushings if not all have failed again along with the lower frame rails cracking. I caught it before it destroyed the chaffer and sieve.

What causes the bushings to fail after 150-200 Hrs? The only thing I can think of is the bushings were installed wrong? I believe someone posted on here that you should tighten to bushings up at the halfway point of the stroke?? Our dealer/techs dont know that if in fact it is true.

Thanks.
 

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it's very true mid stroke. their is a lot of failures of shaker bushings in these combines anymore. watch them close, replace them often.
 

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It is important to tighten the bushing in the mid-stroke position and located in the same position on both sides of the machine. It is not desirable to have any twisting motion on the sieve rails due to uneven timing or tension on the bushings from side to side. This will flex the rail and sieve until eventually something will fail. Case has a dealer tool kit that will help with this alignment. That being said, it can be very hard to get everything "just so".
 

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making sure it is in mid stroke is very importent plus when you tighten each side do it in the same when tighten the bolts. check the rear lower shoe bushing for where you are in the side of the machine with a special tool. tape measure works well
 

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Buy the heartland repair kit, after that is installed you will be able to hold bushings. Without it you will crack rails, break sieves and wonder what the he-- is going on.
 

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sd8010,
The cleaning system has always been a problem for me on my ih rotor combines. I've had a 1440 and now have a standard cleaning system 1680. In fact, just got tonight replacing some bearings and such due to the bushing failure in the pitman arm that runs the cleaning system. What can you tell me about the heartland repair kit? How does it solve the problem or what does it change? How much work is involved in installing the kit? What is the cost? Thanks in advance for any information.
 

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People talk about timing of the sieve rails? How can they get out of time when the shaker shaft is a hex shaft that has a woodroffe key in it to locate the eccentric cam bearing / shaker arm. Once you have that fitted they all move together other wise you will not be able to put the rest of the shaker arms on. Please explain?
 

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In regards to timing, in theory, it should not be possible (or at least, easy) to get the system out of time. A few things that can happen are: The nuts on the hex shaft work slightly loose and the shaft to pittman arm bearing fit become a bit sloppy over time. As mentioned above, it is possible to tighten the bushings incorrectly - if, for example, the left side bushings were tightened slightly forward of center and the right side slightly to the rear. I've seen this happen, the shaker rails will flex slightly with the uneven timing of the bushing resistance. It's not much, but it happens so many time a second. Last thought, it is all too easy to get things crooked upon re-assembly with regards to depth of bushing pressing / shim washers used. Everything must hang straight and arms should not be "pulled in" upon tightening bolts. First lightly snug the bushing bolts, then inspect everything for squareness before doing the full tightening.

Just a few thoughts.
 

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the bearings in the speader chaft went out in our 1440 after 250 hrs and we could not get to the bearing to put the small fire out and we almost lost the combine that time
 
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