NH 477 LH Upper Roller Bearing Replacement

Axtell

Member
Location
RDU, NC
I've read many posts about this bearing replacement including tips on how to remove the sprocket. I am not at the machine, but would like to know the best was to access it. From what I remember there is not a whole lot of room to work there and am wondering if there are other items that need to be remove to make access easier. Will raising the header help any? Any tips on removing the chain from the sprocket? Reason to replace the bearing is it all but disintegrated within the flange.

Lets get to the good part now. The flange is partially welded to the Weld Assy / Plate. I remember reading a post where someone was replacing their bearing because the bolts worked themselves loose and the entire bearing spun with the roller inside the flange. I am wondering if the previous owner had this same problem and cured it by the weld. Since I don't know what to expect if I make it past the sprocket I am wondering about not having enough room to work with whatever to remove the flange. I guess questions are;

1. Will raising the header give me enough room to work?
2. Do / should I remove the gearbox (I have the manual)?
3. Any tips on removing the roll drive chain(s)?

I'll try to attach some pics.
a164162.jpg

a164163.jpg
 
We did get the sprocket off without removing the gearbox. I expected to have problems with the gib key, but it turned out to be a half moon key slotted in the shaft and the sprocket slid right off after loosening the set screw/bolt. The sprocket would slide about 1/4 inch in but only come back flush with the shaft until I loosened the set screw/bolt. Evidently the chain tension holds the sprocket in position. But with the flange the way it is we are going to have to pull the plate off which will require us to remove the gearbox anyway.

We could not pull of the locking collar that holds the bearing in place. We did remove the set screw. It's either rusted or froze on there from the bearing failure. I am worried about that and the remainder of the bearing on the roller shaft, but one thing at a time.
 
You need to grind the weld off to get the bearing flange off. An oxy-acet torch is needed to cut the inner race of the bearing off of the roller shaft.
 
Thanks JMS. I think I can handle the flange. As far as cutting the collar and race with a torch, I am going to have to hand that one off to someone else. What a mess.
 

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