BIFFI ALGA-EAC Series - Page 45

41
Installation, Operation and Maintenance Manual
MAN 564_EAC Rev. 2 June 2020
Maintenance
Section 5: Maintenance
Replacement of hydraulic cylinder seals (see Figure 40) only for ALGA-MHP hydraulic
handpump manual override
If there are leaks in the hydraulic 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 sectional drawing and adopting the
following procedures:
1. Remove the nuts (item 16) and the washers (item 15) from the tie rods (item 10)
at the end ange (item 13) side.
2. Slide off the end ange and the tube (item 12).
3. Remove the screws (item 2 - Figure 39) and the cover (item 1 - Figure 39).
4. Unscrew the piston rod (item 6) threaded end from the adaptor bush
(item 30 - Figure 39) of guide block (item 14 - Figure 39).
5. Slide off the piston rod from the head ange (item 2).
6. Disassemble the head ange from the mechanism housing (item 8 - Figure 39)
by removing the screws (item 7 - Figure 39) only if the gasket (item 36 - Figure 39)
has to be replaced because damaged.
Seals replacement
Prior to reassemble check that the actuator components are in good conditions and clean.
Lubricate all the surfaces of the parts, which move in contact with other components, by
recommended oil (SHELL OMALA S4 WE or equivalent). If the O-ring must be replaced,
remove the existing one from its groove, clean the groove carefully and lubricate it with
protective oil lm. Assemble the new O-ring into its groove and lubricate it with a protective
oil lm.
1. Replace the O-rings (3) of the head ange (2).
2. Replace the O-ring (3) of the end ange (13).
For replacement of piston rod seal ring (4) and of the O-ring (5) proceed as follows:
1. Remove the existing Teon seal ring (4) and the O-ring (5) from their groove.
2. Clean the groove carefully and lubricate it with a protective oil lm.
3. Assemble the new O-ring into its groove and lubricate it with a protective oil lm.
4. Assemble the new Teon seal ring (4) into the ange groove, on the rubber O-ring
(5), by bending it: take care that the bending radius is as large as possible to avoid
damaged the seal. Then enlarge the seal ring with your ngers so as to restore its
round shape: pay attention not to utilize any tools, which can damage the seal ring.