Emerson Bettis CBB Series - Page 15

October 2015
Service Instructions
VA001-196-30 Rev. 1
12
Section 3: Actuator Reassembly
Actuator Reassembly
3�2�8 Rotate the torque shaft (1-30) so that the arms of yoke (1-20) point out the open
end of housing (1-10).
3�2�9 Coat O-ring seal (5-20) with lubricant and install into inner diameter seal groove
located in the center bar hole of housing (1-10).
3�2�10 Coat entire length of center bar (8-10) with lubricant including the threads.
3�2�11 Installhexnut(8-20)ontooneendofcenterbar(8-10).
3�2�12 Insert center bar (8-10) into the center hole of housing (1-10). Slide center bar
throughhousinguntilthehexnut(8-20)isushagainsthousing(1-10).
3�2�13 CoatoneO-ringseal(5-10)withlubricantandinstallontoouterdiameterange
located on housing adapter end of housing (1-10).
3�2�14 Actuators equipped with cylinder adapter (4-15), models CBB520/725, do steps as follows:
3�2�14�1 Installcylinderadapter(4-15)ontotheangeofhousing(1-10)andover
O-ring seal (5-10), with the stepped outer diameter, of cylinder adapter
(4-15), facing away from housing (1-10).
3�2�14�2 Install one O-ring seal (5-15) onto stepped diameter of cylinder
adapter (4-15).
3�2�15 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�2�16 Coat O-ring seal (5-20) with lubricant and install in the internal seal groove in the
head of piston (4-50).
3�2�17 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�2�18 Install bushing (4-80) between the two arms of yoke (1-20).
3�2�19 With the piston head facing away from housing (1-10) and with yoke pin up, install
piston (4-50) onto center bar (8-10).
3�2�20 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�2�21 Apply a coating of lubricant to entire bore of cylinder (4-10).
3�2�22 Pneumatic cylinder installation:
3�2�22�1 For CBB520 and 725 models, install the lubricated cylinder (4-10) over
the piston and up-against the O-ring seal (5-15) on the stepped diameter
angeofcylinderadapter(4-15).
3�2�22�2 For CBB315, 420 and 525 models, install the lubricated cylinder (4-10)
overthepistonandup-againsttheO-ringseal(5-10)ontheangeof
housing (1-10).
3�2�23 End cap seal installation.
3�2�23�1 Coat O-ring seal (5-20) with lubricant and install in the internal seal
groove of end cap (4-20).
3�2�23�2 Install O-ring seal (5-15) onto outer diameter of end cap (4-20).
3�2�24 Install end cap (4-20) onto center bar (8-10) and into cylinder (4-10).