Emerson Bettis CBA*30-SR series - Spring Cylinder Disassembly

August 2015
Service Instructions
137463E Rev. D
8
Section 2: Actuator Disassembly
Actuator Disassembly
NOTE:
CBAX30-SR-M3 or M3HW models the M3 cannot be removed now. The M3 used in these
models can be removed later in this procedure using step 2.3.8.
2�2 Spring Cylinder Disassembly
NOTE:
Review Section 2 steps 2.1.1 through 2.1.5 before proceeding with spring cylinder
disassembly.
CAUTION: SPRINGS ARE PRELOADED
The spring in CBAX30 Series spring-return actuators are preloaded.
WARNING: FOLLOW CORRECT DISASSEMBLY STEPS
Actuator must be disassembled in the following manner.
2.2.1 Loosen and remove hex nut (4-40) from stop screw (4-30) or from ES (4-30).
NOTE:
Stop screw (4-30) or ES (4-30) does not require removal from end cap (4-20) unless
replacing with a new part.
2.2.2 Remove breather (30) from end cap (4-20).
2.2.3 Remove acorn nut (8-20) and gasket seal (5-60) from center bar assembly (8-10).
2.2.4 Use a ratchet and socket on the welded nut, located on the housing end of center
bar assembly (8-10), rotate center bar assembly (8-10) counter-clockwise (CCW).
This will cause end cap (4-20) to gradually unscrew from center bar assembly (8-10).
2.2.5 Continue to rotate center bar assembly (8-10) counter-clockwise (CCW) until the
spring preload is eliminated. As preload is reduced it may be necessary to keep end
cap (4-20) from turning.
NOTE:
Hold end cap (4-20) in position with an adjustable wrench.
2.2.6 After the spring preload is eliminated, unscrew and remove end cap (4-20) from
center bar assembly (8-10).
2.2.7 Remove spring (4-70) from within spring cylinder (4-10).
2.2.8 Hold torque shaft (1-30) and pull spring cylinder (4-10) away from housing (1-10);
slide spring cylinder over piston (4-50) and remove.
2.2.9 Pull piston (4-50) out of housing (1-10) and carefully slide piston off of center bar
assembly (8-10).