Hartzell HC-B3-2 Series Owner's Manual And Logbook page 145

(b) If the beta valve is supplied disassembled, assemble
as follows:
1 Slide the push rod spool onto the pin and into
the sleeve with the threaded end facing away
from the sleeve.
2 Slide the inner and outer springs onto the rod up
to and against the shoulder of the sleeve.
3 Install the spring retainer onto the rod with the
recessed center section facing toward the two
springs.
(5) Slide the partially assembled beta valve into the engine
shaft from the front, allowing the push rod spool to
extend out the rear of the engine.
(a) The shoulder of the sleeve should be against the
shaft adaptor.
(6) Compress the springs with spring retainer and install the
retaining ring that is furnished with the engine to secure
the spring retainer.
NOTE:
(7) Install the ID and OD O-rings on the engine cover, per
the airframe or engine manufacturer's instructions.
(8) Install the engine cover on the rear of the engine
gear box encircling the beta valve push rod spool, per
airframe or engine manufacturer's instructions.
NOTE:
INSTALLATION AND REMOVAL
Propeller Owner's Manual
A locator button on the spring retainer will fit
into a recess in the engine shaft/flange.
Cover plate fasteners are supplied by the
engine manufacturer.
139
61-00-39
Rev. 17 Apr/20
Page 3-45