[R-390] Oldham Coupler Maintenance

[Joe Foley]

But we might be getting ahead of ourselves here.

What you might want to do first is to check that the
KC CHANGE shaft is straight!  It may not be if the
knob has been whacked sideways.  The bushing directly
under the knob should not be tightened too much, just
snug.  Having three bushings on that shaft can cause
binding unless the shaft is exactly true and straight.

You might have to shim the PTO mountings in order to
get the shafts in line.  Remove the center of the
Oldham coupler and use feeler gauges, or shim stock,
to check for parallel running of the two face plates
as they turn.

Joe



--- Flowertime01 at wmconnect.com wrote:

> Fellows,
> 
> Bob wrote about having to readjust an Oldham coupler
> after a maintenance 
> procedure to the VFO.
> 
> The VFO should run with the KC shaft with ease. The
> KC knob in a good clean 
> gear train should almost free wheel when spinning
> the knob and the cams are 
> dropping. That was long ago and your mileage may
> vary in an older receiver. This 
> implies it takes very little torque to turn a VFO
> shaft.

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