75
Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
flowserve.com
8
Spares and
Replacement Parts
8.1 Guidelines for Recommended Spare Parts
Since every Flowserve Limitorque actuator is designed to meet a specific application, the recommended spare
parts needed to support the actuator will vary for every project. The following guidelines are provided to assist in
determining the specific spare parts requirements for your QX actuators.
8.1.1 Wear Components
The following components will eventually wear under normal use and should therefore be planned as spares. The
expected lifetime of these parts will vary from application to application. They are listed in order of most frequent to
least frequent replacement. Flowserve recommends stock levels of between 5% and 10% of the total population of
each part with a minimum of one of each in order to support the product for life.
1. Stem nut
2. Worm shaft subassembly
3. Drive sleeve subassembly
8.1.2 Bearings, O-rings, and Seals
All bearings should be replaced any time an actuator is refurbished. Therefore, all bearings should be planned for
stock for any scheduled refurbishment. In addition, any O-ring or seals should be replaced any time an actuator is
disassembled. Complete actuator seal kits are available for the QX-1, 2, 3, 4, and 5.
Flowserve recommends stock levels for seal kits of 10% of the total population of each actuator model and size.
Also, an adequate supply of Flowserve approved oil (See Section 2.3.2) should be maintained in stock to support any
necessary maintenance or refurbishment.
8.1.3 Critical Components
The following parts are not subject to wear but are still recommended for stock due to their critical nature. Flowserve
recommends stock levels of between 5% and 10% of the total population of each part with a minimum of one of each
in order to support the product for life.
1. Motor
2. Encoder
3. Control module
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