Emerson Bettis CBA*30-SR series - Page 18

August 2015
Service Instructions
137463E Rev. D
14
Section 3: Actuator Reassembly
Actuator Reassembly
NOTE:
While holding the center bar assembly ush against the housing adapter (6-10), push
piston assembly (4-50) into housing (1-10) as far as the piston will go.
3.3.9 Apply a coating of lubricant to entire bore of spring cylinder (4-10).
3.3.10 Spring cylinder (4-10) installation:
3.3.10.1 For CBA830-SR, CBA930-SR and CBA1030-SR models, install the
lubricated spring cylinder (4-10) over the piston and up-against the
O-ring seal on the stepped diameter ange of cylinder adapter (4-15).
3.3.10.2 CBA730-SR models install the lubricated spring cylinder (4-10) over the
piston and up-against the O-ring seal on the ange of housing (1-10).
3.3.11 Apply a coat of lubricant to the spring (4-70). Insert the spring into the spring
cylinder by carefully sliding the spring into the open spring cylinder until the spring
contacts the head of piston (4-50).
3.3.12 End cap seal installation:
3.3.12.1 For CBA830 SR, CBA930 SR and CBA1030 SR models, install o ring seal
(5-15) onto end cap (4-20).
3.3.12.2 For CBA730 SR models, install O-ring seal (5-10) onto end cap (4-20).
3.3.13 If removed, install stop screw (4-30) or ES (4-30) into end cap (4-20).
NOTE:
Position spring cylinder (4-10) so that spring tag (4-60) will be adjacent to accessory
mounting pads located on the actuator housing.
3.3.14 Install end cap (4-20) onto center bar assembly (8-10) by rotating the end cap in a
clockwise direction.
3.3.15 Position the end cap (4-20) so that the breather port is at the bottom and the stop
screw / ES (4-30) is at the top.
WARNING: DO NOT ALLOW END CAP TO ROTATE
Do not allow end cap (4-20) to rotate during center bar assembly tightening. The end cap
must maintain the position as described in step 3.3.15.
3.3.16 Keep end cap (4-20) from turning by holding end cap in position.
3.3.17 Using a ratchet and socket on the center bar assembly nut, rotate center bar
assembly clockwise (CW). This will cause end cap (4-20) to gradually screw further
onto center bar assembly (8-10).
3.3.18 Continue to rotate center bar assembly (8-10) clockwise until spring (4-70) is fully
compressed, the spring cylinder is seated against the ange of housing (1-10) or
adapter (4-15) and end cap (4-20) is properly seated in spring cylinder (4-10).
3.3.19 Torque tighten center bar assembly (8-10) to 233 foot pounds / 316 N-m.
3.3.20 Place seal gasket (5-60) on the exposed end of the center bar assembly (8-10).
3.3.21 Place acorn nut (8-20) on the exposed end of center bar assembly (8-10) and tighten
securely.