Flowserve QX Limitorque - Manual (Page 12)

Limitorque QX Electronic Actuator FCD LMENIM3314-00 – 5/11
12
2.3 Maintenance
2.3.1 Recommended Maintenance
Under normal operating conditions, the QX is a maintenance-free actuator. Therefore, for normal applications, the
actuator will require no formal maintenance program. However, if the actuator is used under severe service conditions
or operated in a Hazardous Location, the following maintenance procedures are required:
1. Check the oil level every 50 hours of operation at a minimum. Where conditions are severe due to frequent
operation or high ambient temperatures, a more regular inspection interval should be maintained.
2. Change the gear oil every 100 hours of operation. See section 2.3.2 Unit Lubrication.
3. All ball bearings, oil seals, O-rings and quad-rings are to be replaced after 450 hours of operation. See sections
2-3-2 thru 2-3-3.
Clean and lubricate the valve stem regularly to avoid torque build-up and wear due to silting and corrosion. Infrequent
operation can lead to corrosion and contamination of the valve stem thread lubricant. Check any thrust bearings that
are fitted to the actuator for proper lubrication at regular intervals.
2.3.2 Unit Lubrication
Change oil every 100 hours of operation or if water or other foreign material is found during oil inspection.
Oil Level Inspection and Fill Criteria
To avoid pressurization of the gearcase, the following recommended oil capacities should not be exceeded: (Reference
Table 2.3 for oil capacities when mounted in varying positions)
• Actuator viewed in upright position (terminal compartment up / base down) Oil level should be approximately 1
inch (25.4 mm) below the outer surface of the housing at the oil fill port.
• Actuators mounted in other orientations than the upright position should have their oil capacities maintained.
Fill through the highest oil fill port until the oil is at a level that will contact the bottom of the plug when installed in the
oil fill port.
NOTE: Do not overfill! Oil will expand during actuator operation. Actuators are shipped with an oil volume suitable for
any mounting position. When checking the factory-supplied oil level, excess oil may drain from the highest oil fill port
due to the various mounting orientations of each application.
Table 2.3 QX-1 thru 5 Oil Capacities
Unit Description Fluid Ounces Litres
QX 1/2 26 0.77
QX-3/4/5 80 2.36
Lubrication Data
Oil Specification – all models
-30°C to +70°C (-22o to + 158o F) units require oil per Petro-Canada SHB-68 or Mobil SHC626
-60°C to +40°C (-76o to + 104o F) units require oil that is 50% Petro Canada SHB-68 with 50% Soltex PAO4