Yamaha U1 practice rail adjustment

[Dave Davis]

I've had a similar thing happen, mostly on Kohler & Campbell-types. The link that mounted under the keybed sometimes gets inverted into the wrong position, and that confounds the adjustment.

Dave Davis, RPT

----- Original Message ----
From: J Patrick Draine <jpdraine at gmail.com>
To: Pianotech List <pianotech at ptg.org>
Sent: Thursday, April 3, 2008 5:20:30 AM
Subject: Yamaha U1 practice rail adjustment

I have a Yamaha U1 I service annually, but I found myself a bit confounded by the middle pedal/practice (quiet) rail adjustment this time.
When I opened it up, the rail was "engaged", i.e. in the "down" position, muffling the impact of the hammers on the strings, but the pedal was in the "up" position.
I wasn't able to adjust the plastic nylon turnbuckle to get it to proper specs.
Is it likely that the rail's spring is the culprit (fatigued and unable to pull the rail up to proper position)? Do the turnbuckle's threads strip out? Anyone know the know the threading dimensions of the parts (the threaded wires, nuts, turnbuckle)?
Seems elementary (maybe I just needed another cup of coffee), but I need to go back this afternoon and "get it right." Help greatly appreciated.
FYI, I did call Yamaha tech services but the promised "we'll have the tech service rep call you back" call never happened.


Patrick Draine
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