BIFFI ALGA-EAC Series - Extraordinary Maintenance; Replacement of Cylinder Seals

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June 2020
Installation, Operation and Maintenance Manual
MAN 564_EAC Rev. 2
Maintenance
Section 5: Maintenance
5.2 Extraordinary Maintenance
If there are leaks in the hydraulic cylinder, pneumatic cylinder or a malfunction in the
mechanical components, or in case of scheduled preventive maintenance, the actuator must
be disassembled and seals must be replaced with reference to the follow general sectional
drawing and adopting the following procedures.
5.2.1 Replacement of Cylinder Seals
(Refer to Figure 39)
!
WARNING
Before executing any maintenance operation, it is necessary to intercept the supply line and
discharge pressure from the cylinder of the actuator.
NOTICE
If the actuator can be operated, it is essential to take it to fail safe position, otherwise the
actuator should be disassembled from the valve and follow these steps:
1. Remove the nuts (16) and the washers (24) from the tie rods (18) at the end ange
(22) side.
2. Slide off the end ange (22) and the tube (19).
3. Remove the screw (2) and the cover (1).
4. Unscrew the piston rod (20) threaded end from the adaptor bush (30) of guide
block (14).
5. Slide off the piston rod (20) from the head ange (17).
6. Disassemble the head ange (17) from the mechanism housing (8) by removing
the screw (15) only if the gasket (36) has to be replaced because damaged.