squeeky damper springs

[Porritt, David]

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Barbara:

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First, I really dislike this pedal setup that Kawai used - I think it's
in some Boston's too.  There are LOTS of places to squeak.  In addition
to the overly complex mechanism you show in this picture, there are the
usual lifter-rod-on-the-damper-lever-felts, the lifter rod bushings etc.
If the metal is corroded no lubricant that I'm familiar with will help.
Polishing all those friction points and then lubricating is the only
thing that will help.  The metal that shows in the picture appears
corroded so I'd guess that the lifter rod and flanges could well be
corroded as well.

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Good luck!

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dp

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David M. Porritt

dporritt@smu.edu

________________________________

From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Barbara Richmond
Sent: Thursday, February 02, 2006 11:23 AM
To: Pianotech
Subject: squeeky damper springs

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Hey folks,

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I serviced this Kawai UST-7 (built in 1983) before Christmas.  At the
time, the bolts had already been installed by someone else to hold the
damper pedal down, and I tightened the screws for the (right side)
damper trap lever assembly to keep it from blasting off.  Miracle cure!
Ah, but there was still noise, I treated the damper spring felts with
Protek--which seemed to take care of the squeaks.  I was hoping that
would be the other miracle cure.

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I went back to take a picture of the pedal assembly, which is a little
different.  The damper pedal pulls down two levers--one to the right,
tenor & treble, and one to the left, the bass.   Could it be this set-up
that makes the pedal feel somewhat stiff?  It would make sense, since
two trap lever springs are being pushed down.  I didn't notice a stiff
damper spring feel in the action itself (after I lubed the spring felt).


=20

When I went back to take the picture last week, I noticed that the
squeaking is back.  I'll admit it, I was in a hurry and didn't take a
close look at the felts.  I suppose cleaning the damper springs and
replacing the spring felt is next.  Is there a different (faster)
solution--like some miracle lubricant I haven't heard of that came on
the market while I was on leave?

=20

Thanks.

=20

Barbara Richmond


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