[R-390] More PTO questions

[Tim Shoppa]

Barry asked:

> Still poking around in this PTO.  Were some PTOs manufactured without 
> linearity adjustments?  I seem to recall some discussion a few years
ago 
> that some did not have them.

Some Cosmos PTO's have screws in the linearity disk "all the way around"
and others only have "most of the way around". I've gone one of each.

But I think they all had to have linearity adjustments. Non-Cosmos ones
have internally-adjusted corrector stacks.

>   This one doesn't have an access hole for any 
> adjustments.  The large hex bolt plug on the "right" exposes only the 
> endpoint adjustment.

The linearity hole isn't exactly behind the transformer can but is just
a
little bit towards the center. Inside the hole you will see a circular
zig-zag
of little 4-flute socket screws.

> Also, there is another hex "bolt" on the "left" made of the same
material 
> as the bulkhead (bakelite perhaps?) that has "S701" labelled beside
it.  It 
> exposes a hollow shaft with a slot that is assumable for a
screwdriver.  Is 
> this a way to disable the heater thermostat?  A reset for it, perhaps?
 I 
> haven't seen it discussed anywhere or mentioned in any of the manuals.

Thermostat set point. I messed mine all up but it doesn't matter because
I don't
ever plan on turning it on :-).

Tim.