Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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8.2 Recommended Spare Parts for QX Actuators
8.2.1 Commissioning and Startup
No additional spare parts are required. All necessary spares are included in the end-user bag.
8.2.2 Short-Term Duty
This is defined as up to 5000 seats or up to 1 million drive sleeve operations, whichever occurs first. There are no
spare parts required for the actuator during short-term duty.
8.2.3 Long-Term Duty
This is defined as service beyond short-term duty but less than 10,000 seats and less than 1.5 million drive sleeve
operations. The spares suggested for long-term duty are as follows:
• Quad rings at the top and bottom of the drive sleeve
• Drive sleeve assembly, which includes the worm gear
• Wormshaft assembly
• Encoder cartridge assembly
• Motor assembly
• Fuse (Controls, quantity 1)
• Fuses (Power, quantity 2)
• Encoder assembly
• Motor controller board
• Control module (includes PCB-power, main, CP, and optional DDC and I/O boards)
• Bronze stem nut for thrust base (multi-turn QXs only)
NOTE: Oil should be changed every 10,000 seats or sooner if the oil has been contaminated with water or
other foreign material.
8.2.4 Severe Duty
This is defined as open/close service when run loads exceed 50% of the unit rating. This also includes
all modulating applications.
NOTE: Oil should be changed every 5000 seats for open/close service, or sooner if the oil has been contaminated.
The spares suggested for severe duty are identical to the long-term duty spares.
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