Rick, I recently had a similar squeak in the damper lift rod on a Kawai upright. Watch the video on www.ptg.org>>> Journal>>> Journal Media Files called Damper Lift Rod Hanger. The second part of the video deals with the squeak. Hope this is relevant. -John Parham > -------- Original Message -------- > Subject: Re: [pianotech] Noisey pedal bracket > From: Richard Ucci <richarducci at comcast.net> > Date: Tue, November 16, 2010 8:24 am > To: "pianotech at ptg.org" <pianotech at ptg.org> > > > Guys, I'm going to try this again. > The noise I'm talking about is from the brackets at the back of the > action that hold the damper lift bar in place. There are three of them > that make a scratchy noise when the rod moves . How is the best way to > remove and lube? > Thanks, > Rick Ucci/ Ucci Piano > www.uccipiano.com > > > On Nov 15, 2010, at 6:27 PM, John Ashcraft <jaashcraft at gmail.com> wrote: > > > I reworked a Yamaha-built Everett studio that was a wonderful piano > > in every other respect. > > > > The trapwork was designed to fail. The fulcrum should be on a line > > (or in the vertical plane containing the line) connecting the force > > at the pedal end with the load at the dowel end: another magic line, > > perhaps. When they put that strong spring off the line, they forced > > the bracket to try to absorb the torque/twist. (Works long enough to > > get it out of the factory and past the free tech visits.) After > > trying many other approaches to removing the noise, I used a hose > > clamp to hold an upper spring support at the side of the trapwork > > tube, made a shallow hole in the bottom board at the correct > > position, and moved the spring sideways to put it in line with the > > force and load. Problem solved, at least until the fulcrum bracket > > fails. > > > > John Ashcraft > > > > > > On Fri, Nov 12, 2010 at 8:28 AM, Ryan Sowers <tunerryan at gmail.com> > > wrote: > > This is one part of piano manufacturing I just don't understand. I > > service 100 year old uprights with simple wooden trapworks that work > > smoothly and noiselessly. These modern metal trapwork systems are a > > constant source of problems - it seems that every tiniest noise is > > greatly amplified, and sometimes transmitted through the parts > > making it very difficult to isolate the source. > > > > The plastic spring cups break, the bushings wear out, the rubber > > grommets squeak and wear out prematurely, the brackets seem to > > click, etc. This is one example of "they don't make them like they > > used to" and its a sad thing! It seems like Yamaha went with this > > system and then every other Asian manufacturer followed suit. > > > > > > On Fri, Nov 12, 2010 at 5:52 AM, Barbara Richmond > > <piano57 at comcast.net> wrote: > > Scratchy sound? What part is doing it? > > > > On Yamahas there is a nylon (or whatever it is) spacer/nut on the > > prop under the pedal that can squawk. No amount of lube will help. > > You need to detach the pedal from the bottom board, detach the pedal > > prop from the lever. Put a leather punching--lubed with your > > favorite grease--between the nylon nut and the pedal. Reassemble. > > > > That's the fix for that squeak. > > > > Barbara Richmond, RPT > > near Peoria, Illinois > > > > > > > > ----- Original Message ----- > > From: "Richard Ucci" <richarducci at comcast.net> > > To: pianotech at ptg.org > > Sent: Friday, November 12, 2010 7:10:13 AM > > Subject: [pianotech] Noisey pedal bracket > > > > List, I know this has been covered before , but... > > How do you eliminate that scratchy sound on Asian uprights when the > > sustain pedal is played? > > What is the procedure used? Remove brackets and lube with pianotech > > glide stuff? > > > > Rick Ucci/ Ucci Piano > > www.uccipiano.com > > > > > > > > > > -- > > Ryan Sowers, RPT > > Puget Sound Chapter > > Olympia, WA > > www.pianova.net > >
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