Emerson Bettis CBB Series - Page 19

October 2015
Service Instructions
VA001-196-30 Rev. 1
16
Section 3: Actuator Reassembly
Actuator Reassembly
3�3�7 Hold the yoke key (1-40) down with your thumb; insert the torque shaft (1-30) by
gently rotating it into the housing (1-10) and yoke (1-20) on the opposite side of
the installed O-ring seal (2-20).
CAUTION: CHECK YOKE KEY ALIGNMENT
Rotate the torque shaft until the yoke key snaps into the yoke keyway.
NOTE:
Two new retaining rings (1-60) and washers (1-65) are contained in the Bettis CBB Service Kits.
3�3�8 Installoneofthenewretainingring(1-60)andwasher(1-65)ontotheexposed
end of the torque shaft, making certain it is properly seated in the groove of the
torque shaft (1-30). Gently push and rotate the torque shaft (1-30).
3�3�9 Rotate the torque shaft (1-30) so that the arms of yoke (1-20) point out the open
end of housing (1-10).
3�3�10 Coat O-ring seal (5-20) with lubricant and install in the internal seal groove of the
center bar “hole” located in housing (1-10).
3�3�11 Coat the following areas of piston (4-50) with lubricant: The outer diameter seal
groove,innerdiametersealgroove,headofpistonandexposedendsofyokepin.
3�3�12 Coat O-ring seal (5-20) with lubricant and install in the internal seal groove in the
head of piston (4-50).
3�3�13 Coat piston seal (5-40) with lubricant and install into outer diameter seal groove of
piston(4-50).Thepistonsealwilltverylooselyintheouterdiametersealgroove.
3�3�14 Coat entire length of center bar (8-10) with lubricant, including the threads.
3�3�15 Install piston (4-50) onto center bar (8-10).
3�3�16 Install bushing (4-80) between the two arms of yoke (1-20).
3�3�17 With the piston head facing away from housing (1-10) and with yoke pin up,
install center bar (8-10) in the open end of housing (1-10) and push the center bar
through the center bar “hole” of housing (1-10).
3�3�18 Installhexnut(8-20)ontooneendofcenterbar(8-10)thatisprotrudingthrough
the center bar “hole” of housing (1-10).
3�3�19 Carefully slide piston (4-50) along center bar (8-10) until yoke pin engages the two
slots in the arms of yoke (1-20).
NOTE:
Whileholdingthecenterbarushagainstthehousing,pushpiston(4-50)intohousing
(1-10) as far as the piston will go. Check to see that bushing (4-80) is positioned between
the yoke (1-20) and the stem of piston (4-50).
3�3�20 CoatoneO-ringseal(5-10)withlubricantandinstallontoouterdiameterange
located on housing adapter end of housing (1-10).