[GreenKeys] M28 typer mainshaft removal question

Nick England navy.radio at gmail.com
Tue Mar 7 17:49:14 EST 2023


Can the mainshaft be slid out either to left or right, or only to the left?

“Why?”, you ask.

I am trying to resurrect a 28 typing unit that has a frozen steel LF
eccentric gear (the one that drives the two LF pawls). It also stripped
some teeth off the fiber LF drive gear on the mainshaft. The LF clutch/gear
assembly is all the way on the left end of the mainshaft so I’d really like
to slide the mainshaft to the right to remove/replace that assembly. That
will avoid removing the mainshaft from all the other clutch assemblies.

I have never pulled a mainshaft before so am practicing on a parts unit.
After removing all the applicable screws I can slide the mainshaft to the
left, but not right.

What am I missing?

Update as I am writing and fiddling with the parts unit. Well, rats! -  it
looks like the mainshaft is smaller diameter where it goes through the
right side bearing. Sigh.  Is this my problem?

So I guess I need to feed in a rod from the right as I remove the mainshaft
from the left to keep all the clutch assemblies roughly in position?

Why are things never simple? Any corrections, advice, words of
commiseration, etc. are welcome.

Cheers
Nick
-- 
Nick England K4NYW
www.navy-radio.com
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