I had to rebush many hanger brackets YC pianos a long time ago. I don't know what they were contaminated with, but no lubricant would quiet them. Maybe an adhesive had seeped through the felt. The problem then wasn't rebushing, but working with the damaged screw heads that held the brackets in place. I remember calling the YC service rep at the time and asking for screws to have on hand. He sent some and they were damaged, too. Apparently he had taken them off a junked action... Barbara Richmond, RPT near Peoria, Illinois ----- Original Message ----- From: "Richard Ucci" <richarducci at comcast.net> To: pianotech at ptg.org Sent: Tuesday, November 16, 2010 7:24:59 AM Subject: Re: [pianotech] Noisey pedal bracket 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101116/5e9d60c8/attachment.htm>
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