Pianotech

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

My suggestion is to clean out the rubber boot the pedal rod sits in and to put two strips of buckskin in the hole Jam the pedal rod into them hole so ir makes a good impression. Cut the excess buckskin with sharp sciissors or an exacto This fix will take care of the rod hitting the sides of the cup or the bottom There also can be play/space in the pedal guide rail that the pedal rod passes through. If so rebush with a snug bushing cloth. Check the cups on the other pedals. I find that the rubber caps dry out, crack or are snug   

**** Strip should be about 3/4 inch wide one vertical and one horizontal over the pedal cup hole - 3 to 4 " in length

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

Wim and James, I think that you are right on.  Thanks much.  I'll keep you informed of how it goes.  Enjoy the Holidays.  Regards, Norman,.

My suggestion is to clean out the rubber boot the pedal rod sits in and to put two strips of buckskin in the hole Jam the pedal rod into them hole so ir makes a good impression. Cut the excess buckskin with sharp sciissors or an exacto This fix will take care of the rod hitting the sides of the cup or the bottom There also can be play/space in the pedal guide rail that the pedal rod passes through. If so rebush with a snug bushing cloth. Check the cups on the other pedals. I find that the rubber caps dry out, crack or are snug   

**** Strip should be about 3/4 inch wide one vertical and one horizontal over the pedal cup hole - 3 to 4 " in length

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

If there are coil springs involved, check those. I have experienced some clicking with those in the past. A little lubricant on the ends of the spring corrected the problem.

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Randy Prentice RPT
Tucson AZ
(520) 749-3788

Original Message:
Sent: 12-22-2023 16:27
From: Norman Brickman
Subject: Damper Pedal Noise

I would appreciate suggestions for the cause of a metallic click associated with the damper pedal of a Kawai 6-foot CA-40N that I service. I have isolated the problem to the external trapwork. If I put my hand on the brass push rod from the pedal I can feel the "click", and if I apply some horizontal pressure halfway up the  push rod while operating the pedal the noise/click goes away. It's true that the lyre posts have come unglued, but the noise is a metallic click – not a wood creak.

I hope/figure that when I return in a couple days and remove the trapwork and disassemble the pedals in the lyre, I will see an issue with the metal damper pedal and its hinge rod. Agree? Can anyone suggest other possible causes that I should watch for? The two metal lyre braces seem to be well attached. The click occurs with/without the little rubber boot being at the bottom of the brass push rod.

Thanks in advance. Regards, Norman

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Norman Brickman
Potomac Piano Service
Potomac, Maryland
potomacpiano@verizon.net
https://potomacpiano.com
(301) 983.9321
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