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SMTA IPTO Disassembly

S

sflem849

Well-known Member
Pete_23 got me inspired to work on the IPTO in my SMTA again. A few days ago he said:

(quoted from post at 21:15:55 05/11/13) First off, did you adjust to try to stop the slippage? To replace the bands you need to just pull back plate off of pto unit. Take seal retainer off, nut on shaft, then rear plate. It requires a special puller to do so but one could be made up. Bands from CASEIH are "like 400 bucks" each. Often times you can exchange the tw bands, brake and engagement one as the brake band seldom wears very much. Be carefull when getting plate off so pto unit does not work out.
Click to expand...

I trashed the PTO dynoing the tractor 5+ years ago. The mechanic running the dyno adjusted the bands and it still slips.

I am running into problems "just pulling the back plate off." I took the four bolts out of the seal retainer and popped it off. The problem is there is no nut in there. There are two different sizes of lock rings and a bearing.

Also, does anybody happen to have a picture of the special puller? Maybe it will be easy to figure out what I need when I get in there.

Here is what I see.


 
I've always replaced or adjusted the clutches in my SMTA and my 450 without taking the unit out of the tractor. Take the rear plate off and slide it off the PTO shaft.Back out the two adjusting screws on top of the unit, then the you can remove the two brake bands(or clutches) I've never tried to disassemble from the pictured direction.
 
Everybody keeps talking about a "back plate" I guess I figured you went at that from the back. :oops: It is no big deal, I have had the PTO out for years. It isn't like I took it off just for this. The bad thing is now I need to buy/make a couple new gaskets. I may have to take it apart in the back because I probably trashed the gasket.

 
The nut is under the rear cover. I see you have the front one off. Take a deep special tool to get nut off, or of course, a hammer and brass punch. Then you need three very long bolts to screw into the three threaded holes, a plate with a hole in middle for bolt to force on end of shaft.
 
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