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10.1 Maintenance, Monitoring
and
Troubleshooting
Every Rotork Fluid Systems actuator has
been fully tested before despatch to give
years of trouble-free operation providing
it is installed, sealed and commissioned
in accordance with the instructions given
in this publication.
The EH actuator’s unique double-
sealed, non-intrusive enclosure provides
complete protection for the actuator
components. Covers should not be
removed for routine inspection as
this may be detrimental to the future
reliability of the actuator. The control
module contains no user serviceable
components. The oil reservoir cover
should not be removed as it contains
hydraulic oil.
All electrical power supplies to the
actuator must be isolated before any
maintenance or inspection is carried out.
Electrical supplies must be isolated
before actuator covers are removed.
If the motorised valve is rarely operated,
a routine operating schedule should
be set up, which may include partial
stroking the actuator at regular intervals.
Routine maintenance should include the
following on an annual basis:
• Check actuator to valve fixing bolts
for tightness.
• Ensure valve stems and drive nuts are
clean and properly lubricated.
• Check the actuator enclosure for
damage, loose or missing fasteners.
• Ensure there is not an excessive
build up of dust or contaminant on
the actuator.
• Check for any loss of hydraulic fluid.
This can be done by removing the
oil fill plug when the electrical power
is removed from the actuator. The oil
level should be within 50mm (2”)
of the filler breather. If it is necessary
to top up hydraulic fluid ensure that
the correct type of fluid is used. See
actuator name plate
• If the oil level is low, visually inspect
the actuator and tighten any hydraulic
fittings that may be leaking.
• Check the operating speeds in both
the open and closed directions
against the test certificate supplied
with the actuator.
• Fully open the actuator and turn the
local control knob to stop. Leave the
actuator for 30 minutes and check
that the actuator has not drifted off
the open limit.
Routine maintenance should include the
following:
• The hydraulic oil should be
replaced after 5 years if the actuator
is operating a modulating valve and
10 years if operating a isolating valve
(Refer to Weights and Measures,
Section 12, for the volume of oil
required).
• The actuator seals should be replaced
after 5 years if the actuator is
operating a modulating valve and
10 years if operating an isolating
valve.
Hydraulic Oil
Standard Applications:
32 cSt Mineral Oil
Mobil DTE 10 Excel 32
Unless specially ordered for extreme
climate conditions or other special
environments, Rotork Fluid Systems EH
actuators are despatched with hydraulic
systems filled with 32 cSt mineral oil.
This oil is suitable for actuators operating
in ambient temperatures from -20˚C to
40˚C. See order specific documentation
for special application.
Troubleshooting
See Fault Alarms in section 9.9 and
Help Screens in section 11.
10
Maintenance, Monitoring and Troubleshooting
