Tooltip: How to Replace Famous Claas Bushings - The Combine Forum
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post #1 of 36 (permalink) Old 10-28-2016, 12:20 AM Thread Starter
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Tooltip: How to Replace Famous Claas Bushings

By now most of you know about this little maintenance item that is neglected in the operators manuals.


The variable speed rotor and cylinder drive support bushings.

These are 3 per drive plastic bushings that "guide" the inner sheave and keep it lined up with the outer one, if they wear thru you will completely ruin the variable drive pulley and that's a $6,000 touch for what can be a 20 minute fix with a $20 part.


We now change these yearly.


This is on a 470r but is very similar for all combines.


Tools you will need:

7mm deep 1/4" drive socket + ratchet
13mm socket
19mm socket
18, 19mm wrenches
1" socket

(optional) 17mm socket, impact, and claas "Spreader" bolt for the variable speed sheave



Ok, into the nitty gritty.


1. Using a 18 and 19mm wrench, disconnect the adjusting oil line going into the drive.



2. Remove these three bolts using a 19mm socket and either a ratchet or impact.


3. Using the 7mm socket, remove the grease tube.


4. Remove the hydraulic adjustor.


5. Remove the 3 bolts using a 13mm socket. And remove the steel ring.



6. This is also optional, but I hate loosing pieces, so I took this rubber washer off of the grease tube hole and put it aside for safe keeping till done.


7.You can now see the bushings around the pins... (1st pic). Push the inner sheave in (towards combine) as far as it will go. Now, you can either pick the old bushings out with a screwdriver, or do step 8 (optional) so you have more wiggle room.


8. If you have these claas spreader bolts, spread the other sheave, it'll slack off the belt and let you spin things way easier. An impact comes in very handy for unding all these bolts.


9. After the old bushings are removed, clean up the holes and start the new ones. Then, drive them home with a 1" socket and a small hammer.


10. Re-assemble in reverse order, remembering that little rubber washer. It also helps to "pull" the inner sheave back towards the outer one a bit.



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post #2 of 36 (permalink) Old 10-28-2016, 09:08 AM
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When these bushing get wore it allows the shieves of the pulley to go up and down which could end up breakng the counter shaft - another famous problem on the lexion combine and not a nice thing to change. For people just learning how to do this never take out the center bolt in the pulley unless you are removing the pulley. This keeps the taper rings that hold the pulley on tight. Again if the pulley is not tight to the tapper rings it will move up and down breaking the counter shaft.


Last edited by SouthernSK; 10-28-2016 at 09:12 AM.
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post #3 of 36 (permalink) Old 10-28-2016, 12:48 PM
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There should be more treads like this one on this "Combine Forum"!
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post #4 of 36 (permalink) Old 10-28-2016, 01:02 PM
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There should be more treads like this one on this "Combine Forum"!
Yeah, but you need to start slower and lower for me
To clean windows, first....

Indeed FF, nice job Chris!

Last edited by Don Boles; 10-28-2016 at 01:06 PM. Reason: Sp
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post #5 of 36 (permalink) Old 10-28-2016, 01:25 PM
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Nice work! Thanks for the post. It reminded me that one of those bushings fell out of my 1688. I couldn't get the new one back in, but I did get the old one back in but it won't last long. Anyone know the proper way to get these in an IH?
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post #6 of 36 (permalink) Old 10-28-2016, 09:32 PM
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Thats it. I can't take dial-up internet anymore!


Good work with the info Christian.
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post #7 of 36 (permalink) Old 10-28-2016, 10:15 PM
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Originally Posted by Christian A. Herrnboeck View Post
By now most of you know about this little maintenance item that is neglected in the operators manuals.


The variable speed rotor and cylinder drive support bushings.

These are 3 per drive plastic bushings that "guide" the inner sheave and keep it lined up with the outer one, if they wear thru you will completely ruin the variable drive pulley and that's a $6,000 touch for what can be a 20 minute fix with a $20 part.


We now change these yearly..
So how many hours /acres are you putting on your machine since you change them plastic bushings yearly?

Last edited by rjlexion; 10-29-2016 at 09:04 AM.
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post #8 of 36 (permalink) Old 10-28-2016, 11:18 PM
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I have been changing them every about 3000 acres and find there is almost no wear.
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post #9 of 36 (permalink) Old 10-29-2016, 12:25 AM
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I think its a regional thing. Big straw load and more tough hours in the day then dry in the NE and we couldn't make a season and we'd go through a set of the plastic bushings. We ended up machining our drives for much larger pins and hard steel bushings.
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post #10 of 36 (permalink) Old 10-29-2016, 03:05 PM Thread Starter
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We do about 200 sep hours a year. They hardly have a mark on them but I'd rather be safe than sorry.

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