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NH 489 wobble drive arm shaft needle bearings

R

riveroadrat

Well-known Member
I have to replace these bearings in 2 machines and wonder if anyone has tried putting 3 bearings in that bottom piece. I know it takes two but don't remember if it was machined all the way on the bottom of the yoke. If any of you out there want to keep your wobbledrive box in good shape make sure that you keep any side slop out of it. If you don't the counterweight will start hitting that big bolt just opposite it. They had to put it in backward, if it was the other way the round head of the bolt would give some more room. I washered mine a lot but it still moves around some. Later I will remove the bars and weld them up so the bushing is tight.
 

Can you share some pictures of what your talking about. I have some work to do on mine and am suspect of where my actual trouble is coming from. Hope you can as I need to correct the problem in mine and there is slop somewhere. I broke my back a year ago and crawling around on or under machinery was very painful last summer. Hope this spring to get back at that 489 haybine which I need working.

Thanks, John.
 
I'll be working on it today and i'll take some pics. You might want to email me to remind me to post them.
 

cvphoto70055.png

I took this pic from a video i took this past summer, i welded the blue piece of steel to the mower frame between the link, took out a good amount of slop, it still has some side to side movement but not alot.
 
I don't know when i'll get to this but here's a pic of the bottom bearing holder with new seals and bearings. Your old oring might be reusable if you seal it with hylomar or some type of flange sealant. You can see there's room for 2 more bearings but I don't remember if the yoke is machined all the way. The bearing number is a torrington B2812 I think. You might want to install new star lockwashers or locktite on the four bolts holding this to the box.
mvphoto68647.jpg
 
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