Mystery grand...THE ANSWER

[pianolover 88]

Maybe nobody has experienced this particular cause of sluggish dampers in 
the treble/bass. Here is the answer:

After noticing the problem, I began in earnest to solve the mystery. After 
removing the action I almost immediately noticed the problem. The piano 
movers had apparently been in a hurry when re-attaching the front legs; each 
has 2 large Allan Lag bolts to secure the front legs, but for some reason 
that's not very clear, one bolt on each side is roughly 1/2" longer (After 
checking there is absolutely NO need for the longer bolt) than the other, 
and if the longer bolt is placed in the BACK part of the front leg, it will 
"push" up on the action, causing the dampers to hang up on the rail 
bushings, not to mention other action problems.
Same problem in the other Kohler Grand (Same case type), but this time the 
longer bolt was pushing the action up on the LEFT side causing the same 
damper dilemma in the bass section. As i unscrewed the longer bolt, i could 
see the action "settle" back down, then i switched to the shorter bolt. 
After placing the longer bolts in the front of leg hole, It was now 
"blocking" the action from sliding back into the keybed, so i removed that 
bolt, replaced the action, THEN put the bolt back in! All worked perfectly, 
but now in order to remove the action, the front leg bolt must be partially 
UNscrewed for action removal. WHEW!!! My Dealer has called the manufacturer 
to let them know. WOW!

>From: jolly roger <baldyam@sk.sympatico.ca>
>Reply-To: pianotech@ptg.org
>To: pianotech@ptg.org
>Subject: Re: Mystery grand damper dilemma
>Date: Fri, 15 Jun 2001 22:00:21 -0500
>
>Hi Terry,
>              Humidity changes can make the span of the guide rail flex as
>much as 1mm causing the wire to bind in the guides.
>A modification is in the works to make it a solid back support.   The
>humidity movement also seems to cause the screws to loosen.  I have often
>fixed the problem by loosening the rail screws and shifting the rail a
>little.  But the fix is temporary.
>Roger
>
>
>
>
>At 04:28 PM 6/15/01 -0700, you wrote:
> >Roger,
> >
> >First, you have to guess the actual cause, which so far nobody has.
> >
> >My easy fix is just that, and indeed permanant.
> >
> >Terry
> >\
> >>The guide rail moves, possibly your easy fix will not last.   Permanant
> >>solution on request.  <G>
> >>
> >>Roger
> >>
> >>
> >>At 01:21 PM 6/15/01 -0700, you wrote:
> >> >Still not the right answer. Hint: It's a simple fix, but the problem 
>is
> >> >caused by something "outside" of the action and keybed, although it 
>DOES
> >> >affect it, causing the problem.
> >> >
> >> >Terry
> >> >
> >> >>From: "Joe & Penny Goss" <imatunr@srvinet.com>
> >> >>Reply-To: pianotech@ptg.org
> >> >>To: <pianotech@ptg.org>
> >> >>Subject: Re: Mystery grand damper dilemma
> >> >>Date: Fri, 15 Jun 2001 12:04:39 -0600
> >> >>
> >> >>Sos tabs in wrong place due to return spring being out of place?
> >> >>Joe Goss
> >> >>imatunr@srvinet.com
> >> >>www.mothergoosetools.com
> >> >>----- Original Message -----
> >> >>From: "pianolover 88" <pianolover88@hotmail.com>
> >> >>To: <pianotech@ptg.org>
> >> >>Sent: Friday, June 15, 2001 11:03 AM
> >> >>Subject: Mystery grand damper dilemma
> >> >>
> >> >>
> >> >> > hi List,
> >> >> >
> >> >> > Here's a good one: While testing a new Kohler & Campbell SKG 500
> >>Grand,
> >> >>I
> >> >> > noticed that the dampers from the mid section up were very 
>sluggish,
> >>and
> >> >> > while they would damp the strings, it took much to long for them 
>to
> >>come
> >> >> > back down to rest on the strings, almost as if in slow motion.
> >> >> > So i tested another identical Kohler grand...SAME PROBLEM! But 
>this
> >>time
> >> >>it
> >> >> > was mostly in the bass section. I did discover the problem, and 
>the
> >> >>remedy
> >> >> > was pretty simple. Any guesses as to what was the culprit?
> >> >> >
> >> >> > Terry Peterson
> >> >> > Precision Piano Service
> >> >> > Torrance, CA
> >> >> >
> >> >> > _________________________________________________________________
> >> >> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >> >>
> >> >
> >> >_________________________________________________________________
> >> >Get your FREE download of MSN Explorer at http://explorer.msn.com
> >> >
> >>
> >
> >_________________________________________________________________
> >Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
>

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com