Bob asked:

> How would you go about disassembling - if you would - this tool


It depends on the make and model, but the most common yankees (41, 44, &c) are
similar, and other makes will, of necessity, have common features.

I will speak directly to the 41,a s that is what I am looking at right now...


When you remove the screw, the chuck may or may not come out. The spring bears
against the back of the chuck body, so when pulling, hold the unit horizontally
in soft material and pull gently. Pull by the exposed body (I ude thin leather
to pad), not the collar. Usually, some heat (heat gun) is needed to grow the
rotating tube off od a mild friction fit. Ditto putting it back together.

Once the chuck is off, the knurled ring at where the rotating tube enters the
body tube can be unscrewed (again, a little heat may help), slid off, and the
handle can be removed.


The top of the spring is guided (and rotation is eased) by an oiled wood rivet-
shaped (headed) pin.


I pull the spring and pin, wipe off grunge, clean the spring and oil with light
micrometer oil, and clean any other parts as needed.


Removal of the rotating tube requires removal of the top of the unit. IIRC (I
won't pull a good tool apart that far right now), there is a male helix attached
to the head of the tool, and the rotating tube has a female helix inside it. I
generally flush the unit lightly with spirits from the oil hole that is normally
covered by the handle, and when it comes out clean, a little light oil goes in
to lube the helix. Again, IIRC, the top comes off by driving out the pin that
aligns the handle when closed, but again, I am not going there right now.


You can work the circular spring clip that holds the washer at the top free, but
it will get caught in the next groove (the handle locking groove) if you try to
slide it past that point. Unless removing the top or there is a real need to get
in and clean there, I'd just leave it.



The 44 is similar (release spring tension at the top for a less dangerous chuck
removal), and most, but not all, other makes and models I have cleaned or
repaired expose the spring and helix by chuck removal.


Be careful of the alignment when reinstalling the chuck, and don't crush the
tubes. They aren't very thick,.


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