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Taking it apart

7/14/2012

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Getting the bottom thrust bearing cap off 

DSC_6267a.jpg (298486 bytes) method of attachment?  This cap doesn't want to unscrew.  From this point of view, we can't even see if it has threads.  But I suspect that it does.

DSC_6297.jpg (315400 bytes) As it turns out, these are right hand threaded parts installed with a thread sealant/thread locker.  To remove: The motor casing was installed back into the chassis with the four fasteners.  This was done to improve leverage for what was to come.....a strap wrench, used in conjunction with a heat gun to soften the thread sealant.  Care was taken not to heat the coils on the other side of this housing!  With moderate unwinding pressure the threaded cap broke free of its bond smoothly and was then unscrewed.  

DSC_6298.jpg (274697 bytes) A considerable amount of thread locker/sealant residue was found on both pieces.

Looking for evidence of wear

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DSC_6310a.jpg (705977 bytes) dimple in center indicates hard contact with the thrust bearing ball.

DSC_6303.jpg (370361 bytes) This one.

DSC_6302.jpg (470189 bytes) Looks like a straight thru bore.

DSC_6308.jpg (213192 bytes) bearing ball diameter on display

DSC_6323.jpg (338152 bytes) gaging the bore for size at the thrust end using this small hole gage made by Starrett.  I use this type when a dial bore gage, or air gage is not available.

DSC_6324.jpg (373955 bytes) It is a split ball design that makes a 2-point contact within the walls of the bore and  that also depends upon the user to develop a "feel" for just the right amount of pressure to find correct size.  But it is possible to be accurate with one of these.

DSC_6327.jpg (321216 bytes) Then, when the size is found, one uses an outside mike to measure over the split-ball to apply a value for the reading.

DSC_6328.jpg (331612 bytes) Getting a size at the top end of the spindle bushing.

DSC_6329.jpg (323320 bytes) Getting another read below toward the center region of the spindle bushing.  

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DSC_6278.jpg (361675 bytes) Note circlip.

DSC_6280 ano.jpg (554434 bytes) checking to see if splined ring will remove when the three machine screws are out.  

It does not pull off the rotor assembly by hand pressure.

DSC_6281.jpg (202268 bytes) checking shaft for size/wear

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DSC_6270.jpg (285538 bytes) packed up for now

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