Rick, Usually you can get to the first bracket's screw/s. Remove that bracket, then pull gently on the whole bar to slide it out of the other brackets and the action, being careful to keep the L parts from hitting levers as they slide by. Inspect the Ls to see if there is any corrosion or fracturing. A partially-fractured part can make noise, and it will render the dampers useless when it breaks off. (I had to fabricate a new one last weekend in a Kimball.) If the bushings are tight on the L parts, you can put some VJ lube on the metal and reinsert the bar, guiding the Ls back into the brackets. If there is any corrosion, you will need to rebush the brackets, and that means removing a few damper levers to get to them. --John Ashcraft On Tue, Nov 16, 2010 at 5:24 AM, Richard Ucci <richarducci at comcast.net>wrote: > 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> > 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> >> 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>richarducci at comcast.net> >>> To: <pianotech at ptg.org>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 >>> <http://www.uccipiano.com>www.uccipiano.com >>> >>> >> >> >> -- >> Ryan Sowers, RPT >> Puget Sound Chapter >> Olympia, WA >> <http://www.pianova.net>www.pianova.net >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101116/48cad9be/attachment.htm>
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