[pianotech] Kawai UST7 sluggish action

[donmannino at ca.rr.com]

Dale,

Feel free to write with the serial numbers to me or Mark at Kawai.  We'll check the age for you.

dmannino at kawaius.com
mwisner at kawaius.com

Usually action centers are not warranty in Kawai pianos, but there are exceptions.

I would pull one really bad one, see if you can find the cause (burr on pin, plating, glue on the pin, etc. etc.) then decide how best to deal with it, repin or shrink or just lubricate.  If the bushings just seem tight with no other obvious causes, shrink fitting my be a simple answer.

Don Mannino




---- erwinspiano at aol.com wrote: 
> 
> (by the way this is Trix writing for Dale who is out in the field)
> 
> Sorry I should have mentioned the sluggishness is in the hammer flange centerpin bushing.  There are three of these pianos at this facility and judging by the age, they arrived here together as soon as the building was built and open....
> 
> Obviously not under warranty anymore....
> 
> trix for Dale
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: John Formsma <formsma at gmail.com>
> To: pianotech at ptg.org
> Sent: Wed, Jan 13, 2010 10:46 am
> Subject: Re: [pianotech] Kawai UST7 sluggish action
> 
> 
> On Wed, Jan 13, 2010 at 12:29 PM, <erwinspiano at aol.com> wrote:
> 
> Has anyone run into a situation where a Kawai USt7 has a sluggish action...if so were you able to come up with a successful remedy, and/or did you find it was covered by waranty?  The one I am tuning doesn't look that old (s/n 1,470,000).....
>  
> Thanks,
> Dale
> 
> 
>  
> 
> 
> 
> Dale,
> 
> 
> I don't often find problems with sluggishness in Kawai pianos. But, when it appears, it's generally in the keys. Usually at the balance hole, but occasionally a tight key bushing.
> 
> 
> One other thing to check is the jack stop rail. If it's too close, it can cause intermittent sluggishness that can be difficult to diagnose.
> 
> 
> Other than that, I guess everything else is gonna be "the basics."
> 
> -- 
> JF
> 
>