Yamaha damper question

[Roger Jolly]

Hi Isaac,
          Yes I have seen some pins from the early 70's give problems.
Remove a few pins and if they looked stained and scored, you have a plating
problem. The first ting I do with this age of Yamaha, that has started to
get heavy and sluggish, is remove a few pins and inspect them. CLP seems to
work only for a short time, on this problem at best.  If you are
suspicious, warn the customer, so you are not paying for the inevitable
recall.
For some strange reason, I noticed it more on underlever assemblies in this
neck of the woods.
If Mark is reading he could tell us the years that they had the problem.

Regards Roger


At 08:26 AM 5/3/02 +0200, you wrote:
>Yesterday worked on a Yamaha G2 that was needing some deep needling, PR and
>tune, and un muting of all aliquot scales (ha ha ha).
>
>Almost some hammers I moved in a vertical position was blocking after that.
>Treated with CLP and moved back & forth a few time, and it works, but I
>really wonder if the pinning is shot . I had the case yet where CLP did not
>help enough to bring things back .
>Touch a bit heavy of course (trucking) on this piano.
>
># E 173363 ( 1973 )
>
>Do some of you had tight pins problems on these years grand's ?
>
>Thanks
>
>Isaac OLEG
>
>
>
>
>
>> -----Message d'origine-----
>> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
>> de Roger Jolly
>> Envoye : jeudi 2 mai 2002 21:11
>> A : pianotech@ptg.org
>> Objet : Re: Yamaha damper question
>>
>>
>> Hi Clyde,
>>           Yep, and the right vintage. Don't beat around the bush. Prepare
>> the customer to pay for the underlever tray removal, and reinstallation.
>> Replace all centre pins. It's about 8hrs work to do, and get them
>> all timed.
>> I like to ream them all out to a #21 pin so that I remove some bushing
>> cloth and get the bushings clean.   I've done lots of them, and
>> no recalls.
>>
>> Regards Roger
>>
>>
>>
>> At 07:57 AM 5/2/02 -0400, you wrote:
>> >Friends,
>> >
>> >Earlier this week I received a complaint that a key was sticking on a
>> >1976 Yamaha G2 grand piano.  When I arrived I diagnosed the problem as
>> >the D#4 damper not returning to rest on the strings after the note was
>> >played.  I replaced the center pin holding the damper lever to the
>> >damper lever wire flange and all was fine.  The same thing had happened
>> >to the neighboring D4 damper three years ago.
>> >
>> >The removed pin looked discolored where it rotated in the felt bushing,
>> >so I decided to check it out under a microscope and see if I could learn
>> >something.  Some friends have a cheap one, but it served to show me that
>> >the center pin appeared to be deeply scratched around the pin.
>> >
>> >Now to my questions:  Is this a case of flaking plating that I heard
>> >about?  If not, what is likely the problem?  Are the center pins I buy
>> >from Schaff plated as well?  Will this become a chronic problem for this
>> >particular piano?  If so, is there any preventive measure I can take
>> >without replacing that center pin in every damper?
>> >
>> >Thanks,
>> >Clyde Hollinger, RPT
>> >
>> >
>> >
>> >
>> Roger Jolly
>> Balwin Yamaha Piano Centres.
>> Saskatoon/Regina.
>> Canada.
>>
>
>
Roger Jolly
Balwin Yamaha Piano Centres.
Saskatoon/Regina.
Canada.