[pianotech] Yamaha U1

[William Truitt]

These squeaky keys are not uncommon on Yamaha verticals.  The P-22 school
pianos are famous for these "bird chirps".  In a heavy use classroom
situation, they wear quickly and cavitate on one side easily as they wear.
I think the chirping comes from felt that has worn through enough to be
contacting glue that had wicked into the felt, along with David's
observation about the non-parallel cutting.  I've noticed this on these
pianos for the past 15 or 20 years, so it is not a new problem.  I think the
problem is exacerbated by poor quality bushing cloth along with the glue
they use.  Use the best bushing cloth you can get to rebush, or leather.
But they will wear faster anyway.

 

You CAN do something about it - you can get them to keep you coming back and
pay you to  rebush the keys every few years if the piano is used a lot.

 

Will Truitt

 

 

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Sunday, August 30, 2009 8:23 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Yamaha U1

 

I think it has to do with how the keys and/or mortises were cut such they
aren't parallel to the plane on which the key rotates.  That causes a slight
pulling to the right of the key relative to the mortise which wears down the
left side of the mortise more quickly.  If that's the case, you can't do
much about it.

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Matthew Todd
Sent: Sunday, August 30, 2009 4:58 PM
To: pianotech at ptg.org
Subject: [pianotech] Yamaha U1

 


I recently had a call to fix annoying squeaks that were persistent in a
client's piano.  I discovered that on numerous keys (not all), that one side
(left side) of the balance rail bushing was worn down.

 

Before I go replacing the bushings, what would be the cause of this?  Do you
run across this in this particular kind of piano?

 

Thank you,

TODD PIANO WORKS 
Matthew Todd, Piano Technician 
(979) 248-9578

http://www.toddpianoworks.com <http://www.toddpianoworks.com/> 

 

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