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N50 Eccentric Shaft Issues

dada1234's picture
dada1234

N50 Eccentric Shaft Issues

Hello Everyone, 

Thank you all for all the posts previously. It all helped me tremendously in my restorations. 

We just purchased a 2002 model recently, where the eccentric shaft was damaged beyond repair. My question is has anyone ever removed the eccentric shaft? The service manual says it is easy to remove after removing the bolt and the little lock screw, however, my experience is not that easy because in the shaft only the bottom part is threaded and the top section is smooth. Does anyone know how to remove them without damaging the threads (the shaft hole is made from aluminum and very ductile)  My guess is these shafts are inserted via heating the housing because the tolerances are very low?

Any help would be greatly appreciated! 

best,

brock

nickelmore's picture
nickelmore

What are you calling the ecentric shaft?   I looked at the parts diagram and did not see anything listed like that.   I have one apart now and do not recall any threaded shafts.

nickelmore's picture
nickelmore

I think I may see it.   Are you talking about #2  If you are simpley remove #3 and #9 pins. As I recall #3 is a TAPERED pin and 9 is an 1/8 inch roll pin.

 

 

dada1234's picture
dada1234

Hi,

Thank you very much for your reply.

It is part 1. The noise adjustment is made via is a set screw and the locking nut on the other side of the gear housing.  The instructions simply say remove the set screw (1) and the locking nut (2) and remove. But it is not that easy to remove this piece because both the shaft and the shaft hole is very ductile since they are made from brass and aluminum. I looked at couple of restoration videos on youtube but no one removed it even for the paint job. 

cheers,

Hobart N50 Eccentric Shaft

nickelmore's picture
nickelmore

I removed mine for paint....  I do not remember it being troublesome.  There is no brass on my houseing on the the pot metal housing.   I would take a pair of vice grips and hold the one end of the shaft in the area of the keyway and remove the nut.   Is the set screw stripped?   As I recall the set screw tightens down on a flat surface.   That should also help hold it in place.   If someone had it apart in the past and used a thread locker glue you may need to slightly heat the nut.   The area where this shaft goes through is pretty thick .

nickelmore's picture
nickelmore

I looked at a parts machine I just picked up and the brass shaft was still in it.   The copper washer was wedged on the brass shaft but once that was corrected it moved freely.   It does not have a flat spot on the shaft.   I would suspect that there may be a burr from the allen head socket that may be holding it in place.    I can't believe that it is seized unless the unit was under water.   If there is any white powder on any of the parts it may be a different challenge.  

I would loosen the nut up even with the end of the threads and get a 1 inch wood dowl (or a wood spoon in a pinch) and angle it enough to tap it with a hammer.

 

 

dada1234's picture
dada1234

thank you very much for your reply! it was very valuable information! The set screw sits on a flat section on the shaft! That explains a lot, so I assume that once the nut and washer is removed the shaft slides out of the shaft hole (because there is no indication that the shaft hole is also threaded). I am also trying to understand the piece mechanically, it seems like by rotating the shaft trasmitting gear radially displaces, but no vertical movement. 

many thanks again nickelmore, your guidence helped me a lot! 

nickelmore's picture
nickelmore

Just curious if you got it apart?