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Implement Alley Discussion Forum

S69 plunger bearing

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Neal from PA

08-23-2012 18:40:34

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HI, I just replaced the bearing that goes on the crank pin from the main gearbox for the plunger. The old one flew apart while baling. I replaced the cap,bearing and the bearing came with a new lock collar. I had some difficulty getting the bearing seated in the cap, but finally got it seated squarely. Tapped the bearing /cap assembly onto the pin until the collar would be flush with the end of the pin. Rotated the plunger by hand and went to finish baling. After a while I heard a noise and went to check. The plunger bearing had pushed the lock collar off of the pin and was about flush witht the end of the pin. and as I rotated it by hand i can see where the end of the bearing cap makes a slight contact with the end piece of steel that the cover rests on.Im not even sure what to check at this point.The gear box doesnt appear to have moved, and i can see where the side of the plunger rod came in contact with the crank, theres clearance there now, but im wondering if thats what pushed it towards the outside of the pin(away from the crank) causing the lock collar to be displaced. Anyone ever seen anything like this? Ideas? thanks Neal I have hay to bale this weekend, hope someone can shed some light on this

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08-23-2012 19:49:11

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 Re: S69 plunger bearing in reply to Neal from PA, 08-23-2012 18:40:34  
Hi Neal, When you tapped the brg on the pin and
the collar also, did you just tighten the set
screw or did you correctly rotate the collar while over the wide spot of the brg and tap with
a hammer and punch to wedge the brg to the shaft
If not that is likely the problem. Chuck

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Neal from PA

08-24-2012 02:49:34

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 Re: S69 plunger bearing in reply to chuck41, 08-23-2012 19:49:11  
Hi Chuck, thanks for the response. I tapped the bearing/cap onto the pin until i could slide the collar on so that it was flush with the end of the pin. i rotated the collar until it fit snugly against the inner race of the bearing then tightened the set screw. The collar didnt need to be tapped on. It slipped over the end of the pin without much problem. I rotated it until it dropped into place. No tapping needed. Did I not do something I should have? Thanks,Neal

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08-24-2012 06:33:23

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 Re: S69 plunger bearing in reply to Neal from PA, 08-24-2012 02:49:34  
Yes you did. You need to tap the lock collar in the opposite direction of its rotation to lock it. Just tightening it by hand is not going to lock the bearing to the shaft. That is what the small hole in the collar is for. So tighten it by hand then take a punch and lock the collar with a couple of good hits not just little taps.

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08-24-2012 09:40:22

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 Re: S69 plunger bearing in reply to JDseller, 08-24-2012 06:33:23  
Actually... according to SKF's literature, eccentric lock collars are to be locked in the direction of shaft rotation, not opposite. In many instances it probably doesn't much matter but every so often it does...
I think he'd also want to check the connecting rod alignment here and make sure the new bearing is set on the crank such the the rod is parallel to the bale case...


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