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Installation, Operation and Maintenance Manual
MAN 707 Rev. 3
Section 5: Maintenance
Maintenance
March 2022
Section 5: Maintenance
5.1
Periodic Maintenance
HLAS-C actuators are designed to operate long-term in heavy-duty operating conditions
without maintenance needs.
NOTICE
Periodicity and regularity of inspections is particularly influenced by specific
environmental and working conditions. They can be initially determined experimentally
and then be improved according to actual maintenance conditions and needs.
Anyway every 2 years of operation, the following is recommended:
•
Check that the actuator operates the valve correctly and with the required
operating times. If the actuator operation is very infrequent, carry out a few
opening and closing operations with all the existing controls (remote control, local
control, emergency controls, etc.), if this is allowed by the conditions of the plant.
•
Check that there are no hydraulic leakages. If necessary, tighten the nuts of the
pipe-fittings.
•
Check oil level into the hydraulic manual handpump if present (refer to technical
documentation furnished for this component).
•
Check that the actuators did not undergo accidental damage with oil leakages
found on site.
•
Check that improper closing of control group cover did not produce the presence
of condensation on it.
•
Check the integrity of worn-out parts (gaskets, pads, etc.).
•
If there is an oil filter on the actuator, bleed the condense water accumulated in
the cup by opening the drain cock. Disassemble the cup periodically and wash
it with soap and water; disassemble the filte; if this is made up of a sintered
cartridge, wash it with nitrate solvent and blow through with oil. If the filter is
made of cellulose, it must be replaced when clogged.
!
WARNING
Installation, commissioning and maintenance and repair works should be carried out by
qualified staff.
NOTICE
Before carrying out any maintenance operation, it is necessary to close the hydraulic feed
line and exhaust the pressure from the actuator cylinder and from the control unit to
ensure safety of maintenance staff.
