[CAUT] buzzing truck

[Conrad Hoffsommer]

johnsond wrote:
> Hi all-
> 
> The truck on our #2 performance piano has a problem buzz.  It has been 
> elusive for some time mostly because it's been difficult coordinating 
> the occurrence of the buzz with someone else available to play the note 
> while I check things out.  This finally happened yesterday.  All bolts 
> are tight.  When we play a Bb there is a buzz coming from somewhere 
> between the top and bottom center plates.  Laying only the weight of my 
> hand on the top plate makes it stop, remove my hand and it comes back.  
> It does not sound like any stray material is inside but it will not be 
> possible for me to remove the truck until summer sometime. What I did 
> was loosen the suspicious bolt about half way which allowed the plates 
> and arm to reposition slightly, then re tighten.  I have not been able 
> to make it recur since then.  It is a standard Colson truck from 
> Jensen's that I guess is about 15 years old.  I am inclined to recommend 
> just replacing the whole truck as I was expecting to replace the wheels 
> anyway this summer.  As anyone else experienced a similar problem with a 
> truck?  How long do you typically keep them on performance pianos?  Any 
> other suggestions.....?    It needs to be resolved with confidence.
> thanks,
> 
> Dennis Johnson
> St. Olaf College


The rattles I've encountered on stage trucks were coming from the swivel 
cups at the end of the arms. I finally put squares of action cloth under 
the cups. (Holes cut in centers for screws, of course)

A similar application of felt or cloth might work for you.



-- 
Conrad Hoffsommer, RPT - Keyboard Technician
Luther College, 700 College Dr., Decorah, Iowa 52101-1045
1-(563)-387-1204 // Fax 1-(563)-387-1076

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