BIFFI FCB Series, Manual

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March 2022
Service Instructions
VCIOM-15313-EN Rev. 1
8
Section 2: Actuator Disassembly
Actuator Disassembly
2.2 Spring Cylinder Disassembly
NOTE:
Review Section 2, steps 2.1.1 through 2.1.2 before proceeding with cylinder disassembly.
! CAUTION
The spring in FCB-Series spring-return actuators is preloaded.
! WARNING
Actuator must be disassembled in the following manner:
2.2.1 Remove hex nut (1-80) as follows: For FCBB315 through 725 standard housing
stop screw or extended stop (ES) use step 2.2.1.1. For FCBB315-SR-M3/M3HW
through FCBB725-SR-M3/M3HW use step 2.2.1.2.
2.2.1.1 Step 1. For FCBB315 through 725 housing stop screw or extended stop
screw (ES):
2.2.1.1.1 Loosen and remove hex nut (1-80) and washer (2-35) from
stop screw (1-70) located in housing (1-10).
2.2.1.1.2 Remove stop screw (1-70) located in housing (1-10).
2.2.1.2 For FCBB315/420/520/525/725-SR-M3 or M3HW:
2.2.1.2.1 Remove retainer ring (12-30) and groove pin (12-20) from
optional hex drive hub or from hand wheel (12-10).
2.2.1.2.2 Remove optional hex drive hub or handwheel (12-10) from M3
jackscrew (1-70).
2.2.1.2.3 Loosen and remove hex nut (1-80) from M3 jackscrew (1-70).
NOTE:
For FCBB420, 520, 525, 725-SR-M3 or M3HW models: the M3 jackscrew (1-70) cannot be
removed now. The M3 jackscrew used in these models can be removed later in this
procedure per step 2.3.7.
2.2.2 Loosen and remove hex nut (4-40) and washer (4-90) from end cap stop screw
(4-30) or from end cap extended stop (4-30).
NOTE:
Extended stop or end cap stop screw (4-30) does not require removal from end cap (4-20)
unless a new extended stop or stop screw is being replaced.