Originally Posted by
nodrama
No. Six nuts hold the actuator (servo, hyd unit) onto the gearbox. There’s the two nuts either end of the pitch control rod (shaft) and one bolt/ nut attaching the flying controls to the input/ feedback lever. 4 hydraulic pipe unions, a some electrical plugs. That’s it. Very straight forward.
The pitch control rod (shaft) just passes through the centre of the duplex bearing (which is part of the spider) when the actuator (servo, hyd unit) is fitted to the back of the gearbox.
Perfectly explained. So the control shaft is an easy sliding fit through the inner race of the duplex bearing? And it's the castellated nut (and spacer) that clamp the inner race to the step at the outer end of the control shaft?
Only question left is the detail of the control shaft/outer shaft/hydraulic piston, which isn't really relevant.