Installation, Operation and Maintenance Manual
MAN 689 Rev. 6
June 2021
Low temperature conditions (until -60 °C)
Manufactured Name
SYNTESIS
SYNTRASS-CS 500
Viscosity at -60 °C
580 cST
Viscosity at -30 °C
39 cST
Viscosity at 20 °C
5,8 cST
Viscosity at 50 °C
2,1 cST
Flash point
152 °C
Pour point
-68 °C
Specific weight
0,897 Kg/dm
3
(or equivalent)
37
Maintenance
Section 5: Maintenance
5.3.5
Maintenance for MHP
NOTICE
Before carrying out any maintenance operation, it is necessary to close the pneumatic
feed line and exhaust the pressure from the actuator cylinder and from the control unit, to
provide the proper safety conditions for the staff.
The hydraulic unit has been designed to work for long periods in the most severe
conditions, without the need for maintenance.
It is, however, advisable to periodically check that:
•
With the handpump manual override the actuator operates the valve properly
both in opening and in closing.
•
There are not leakages in the hydraulic connections. Tighten the nuts of the pipe
fittings if necessary.
•
The hydraulic oil is in good conditions. If necessary and anyway every 3 years,
substitute the oil into the oil tank by removing the plug (item 27) so to drain all the
oil and by pouring the new oil into the tank through the hole of dipstick.
If some dirt or/and sludge is found in the oil drained from the tank, before filling with new
oil the tank, disassemble the oil tank tube, by unscrewing the two cap nuts (item 2 )
and clean the internal surfaces of the tank. If necessary, substitute the O-Ring (item 21)
of the tank.
Periodically visually check that the external components of the hydraulic unit are in good
condition and check the paint-work: if some areas are damaged, repair the paint work
according to the applicable specification.
In case of malfunction of an hydraulic unit part, disassemble it looking to the attached
sectional drawings, clean the components, substitute the damaged ones (if any),
substitute the seals if necessary, reassemble taking care to not damage the seals.
Carry out a few operations to check that the hydraulic unit works properly both with
pneumatic operation and with manual operation and that there are not leakages.
