Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
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6
Maintenance
Under normal operating conditions, the QX is a maintenance-free actuator. For ordinary 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 opera-
tion or high ambient temperatures, a more regular inspection interval should be maintained.
2. Change the gear oil every 100 hours of operation. See Section 6.1, Lubrication.
3. All ball bearings, oil seals, O-rings and quad-rings are to be replaced after 450 hours of operation. See Bulletin
LMENIM3314, QX Maintenance and Spare Parts for disassembly procedures.
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. For additional details refer to LMENIM3314, QX
Maintenance and Spare Parts.
6.1 Lubrication
QX actuators are oil-filled, as standard, using Petro Canada SHB 68. This product is a synthetic machine oil suitable for
ambient temperatures of -20°F to 250°F (-30°C to 120°C). For extreme low temperature conditions (< -30°C to -60°C),
an alternative lubricant is available—50% Petro Canada SHB 68 with 50% Soltex PAO 4. Consult factory for arctic
temperature applications.
6.1.1 Oil Capacities
To avoid pressurization of the gearcase, the following recommended oil capacities should not be exceeded:
Table 6.1 – Oil Capacities
Unit Description Fluid Ounces Liters
QX-1 /2 26 0.77
QX-3 /4/5 80 2.36
6.1.2 Checking Oil Level
To check the level:
1. Remove the uppermost filler plug on the gearcase.
2. Check that the level of oil is within 1 inch (25 mm) of the hole (when actuator is mounted with base horizontal).
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