[pianotech] lubricating damper springs?

[Gerald Groot]

It's possible that the rod is squeaking on the damper felts themselves too.
Or, in the pedal grommets.  Did you check these too?  

 

Of, if the sustaining rod and bass rod are two separate pieces, the two of
them could be interacting together, creaking where they engage when you push
down on the sustaining pedal.  

 

If it is the rod, remove it, clean it good, I like brasso for that but,
there are probably other things too and re-install.  Check to make sure the
dampers are not all gunked up with crud too from the rod.  

 

Sometimes, the felt between the two separate rods come loose, is worn, or
gunked up.  Clean it or replace the felt and that might solve it.

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Gregor _
Sent: Tuesday, May 12, 2009 8:50 AM
To: pianotech at ptg.org
Subject: [pianotech] lubricating damper springs?

 

List,

I have a problem with annoying sounds when depressing the right pedal of an
upright very slowly. It turned out that it comes from the dampers or the rod
that lifts the dampers. Usualy I fix it with lubricating the springs and the
rod and the hinge-joints of the rod. But in this case it did not help. The
spings are not embedded in felt or leather but in graphitated wood. I used
stag fat for the dampers and the rod, which usualy helps allways (for the
hinge-joints I used Protec CLP). Was that a mistake instead of using graphit
for the spring embedding? I mean, if new graphit were the only way to solve
such a problem, then a future application of graphit could be hindered by
the fat on the springs. But I am not shure about that.

Any ideas about the source of these sounds and the solution of that problem?
It´s an Ibach C upright from 1986 with a Renner action. It seems that the
bass dampers are the main culprits.

Gregor

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