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Discussion Starter · #1 ·
We are having trouble with our 2001 2388 breaking the rear frame of the top sieve. The combine has done about 700 rotor hours but we have broken the sieve twice and can't find anything wrong with the bushes. Was wondering if there is something simple to fix the problem.
 

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Is it breaking right in the middle accross a bolt hole?

2 things I'd check. One is the cam on the left side. There's a big nut holding an eccentric cam inside that large diameter bearing. That cam is'nt wedged onto the shaft, it just sits on there with some clearance that is actually shimmed into it. Once there is too much wear on the shaft and cam, it will allow the right and left sides to shake just a little out of time with each other.

Then I would pull the chaffer and lay a piece of plywood on the shoe sieve and look around up by the fan and under the grain pan on each side. See if you can see any clearance issues where the chaffer frame comes all the way foward.

Other than that, is the tubular cross brace still in between the chaffer rails? If anyone has changed out any bushings, did they put the right bolts back in and in the right direction?

Something I did was to put all new USA made #8 bolts in that were long enough to avoid having the threaded part in any of the working surfaces. I would pull the bolt tight and then cut off the exess so there was pretty much only the bolt shank doing the work.

Hopefully something there will help ya. It gets spendy replacing that chaffer.
 

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You might want to give Heartland repair a call. He makes the CSR (cleaning system repair) kit. I had him install one on my 2188 3 years ago and have not had any poblems since. When I bought the combine it had a new Chaffer, and I broke the chaffer rails the first year I run it. I think he has a web site to take a look at what its about. Very nice fella and I think he would more than happy to explain what he feels causes these problems if you give him a call. Good luck 701-755-3326 is the phone number I found.
 

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Hi kiwi and welcome to this forum!

Is it the sieve that's braking up or the sieve box?

From what I have heard, a cracked sieve box is caused by the play between the drive pulley and the slip clutch for pulling the sieve box. If you haven't welded up the slip clutch already, then do it. (remember it's cast iron so you'll need the right welding rod for that job)

- Peter
 

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Discussion Starter · #5 ·
thankyou all for the replies. It is the actual chaffer sieve thats breaking around the bolt holes where the adjusters are at the back of the sieve. We strengthen that up but it broke again. So i will try your ideas and report back!! thanks once again.
 

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First it would be good to find out just where the problem is that caused the breakage. Then if you want to keep your old chaffer as a spare, here's what I did to salvage an old chaffer that broke and re-broke after I too braced it up. It's been a while since I did this so I'm going by memory on the tube size, but I think I used 1.5"x3"x.25" rectangle tube.


Then I cut a piece of heavy flat bar and drilled and tapped one hole for the cinch bolt, and cut out a section the same size in the tube to weld the flat bar in.


Then I had to notch the top so the chaffer would mate up to the rails.


I used a cutoff wheel and a plasma to cut the old broken weak tube out. (do this work in a well vented area dont breathe the dust or smoke) Then cleaned up the cut joints, tacked the new tube in and squared it up, then welded it solid.

Just an idea if you wish to repair your old chaffer.
 

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I would definatly change all the bushes, we have had broken sieves in the past and if you change the bushes and set it up right you should solve it. Also check for play on the lhs tennis raquet where it slides onto the shaft. Loctite may help. Also make sure sieve is in the middle of the machine when you tighten the bolts, use washers to get it right. Tighten bolts in the middle of the stroke and let sieves stand in the middle of the stroke over winter.
Can you hear any noise from the sieves when its running, if you can I'm sure its bushes!
 

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I agree with greedyguts....We had a problem and had to change all the bushings in the shaker arms. When they get worn they will beat the sieves to death.
 
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