[R-390] R-390A Zero adjust

[rbethman]

Yes, the disc on the end of the zero adjust knob SHOULD turn.

The clutch is what should NOT turn freely.

They are two separate entities.

The zero adjust plate pushes on the clutch to allow movement of the PTO 
*without* moving the geartrain.

That's why the Veeder root counter does NOT move when making a zero 
adjustment.

Bob - N0DGN

On 3/16/2013 4:45 PM, k2cby wrote:
> The disc attached to the zero adjust shaft on my R-390A (a 1954 Motorola)
> has always been loose and rotates freely, but it works fine.
>
>   
>
> As the zero adjust knob is rotated clockwise, the disc at the end of the
> shaft bears on three pins projecting from the clutch. The disc doesn't turn
> anything; it imparts pressure, not rotary motion. So long as the pins are
> depressed the clutch will disengage.
>
>