Emerson Bettis CBB Series - Page 16

October 2015
Service Instructions
VA001-196-30 Rev. 1
13
Section 3: Actuator Reassembly
Actuator Reassembly
NOTE:
Position the end cap (4-20) so that the inlet port is at the bottom and the ES or stop screw
(4-30) is at the top.
WARNING: FOLLOW END CAP INSTALLATION STEPS
If step 3.3.24 is not completed as described, the center bar O-ring seals (5-20) may become
a source of pressure leakage and cause the actuator to fail.
3�2�25 Installthesecondhexnut(8-20)ontothecylinderendofcenterbar(8-10).Adjust
thetwohexnuts(8-20)suchthattheapproximatesamenumberofthreadsis
exposedontheendsofthecenterbar(8-10).
WARNING: DO NOT ALLOW END CAP TO ROTATE
Do not allow end cap (4-20) to rotate during center bar tightening. The end cap must main-
tain the position as described in step 3.2.23.
3�2�26 Tightencenterbar(8-10)tothepropertorqueasspeciedinthefollowingchart.
Table 3� Tightening Torque Center Bar (1)
CBB Actuator Model
Maximum Torque
Lbf-in� N-m
315 55 75
420 AND 520 100 136
525 AND 725 130 176
3�2�27 If removed, install ES or stop screw (4-30) into end cap (4-20).
3�2�28 Install O-ring seal (5-30) onto the ES or stop screw (4-30). Install the O-ring seal
against the end cap (4-20).
3�2�29 Install new washer (4-90) onto the ES or stop screw (4-30). Install the washer
against the end cap (4-20).
3�2�30 Installhexnut(4-40)ontostopscrew(4-30)
NOTE:
Leavehexnuthandtight.
3�2�31 If removed install ES or stop screw (1-70) into housing (1-10).
3�2�32 Install O-ring seal (2-30) and CSK washer (2-35) onto the ES or stop screw (1-70).
Install O-ring seal against the housing (1-10).
3�2�33 Installhexnut(1-80)ontoESorstopscrew(1-70).Leavehexnuthandtight.
3�2�34 Adjust both stop screws or ES (1-70) and (4-30) back to setting recorded in Section
2step2.1.2undergeneraldisassembly.Tightenbothhexnuts(4-40)and(1-80)
securely, while holding the ES or stop screws in place/position.