Flowserve L120 Series Limitorque Actuation Systems - Manual (Page 31)

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Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-AQ – 05/15
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a CAUTION: The L120-10 through 40 thrust base contains lubrication. Ensure that EP-00 is replaced
when reassembling thrust base.
NOTE: Installation and retention of O-rings and quad rings can be eased by applying a small quantity of
EP grease to the ring during assembly.
To replace the stem nut:
1. Disconnect all incoming power to the actuator.
2. Remove actuator from the valve.
3. Remove Seal Retainer (piece 102 of Figure 6.2) followed by stem nut, bearings, and seals.
4. Check the fit of the new stem nut on the valve stem - ensure that the nut travels freely without
binding.
5. Reassemble the thrust base and remount the actuator on the valve.
6. Remount the actuator on the thrust base.
7. Removing the actuator from the valve will change the limit switch settings. Reset the limit switch in
accordance with Section 4.5.1, Setting Limit Switch.
8. Reconnect power.
9. Test for correct functioning.
6.9 Reassembly
Piece numbers refer to Figures 5.1, 5.2, 6.1, 6.2, and 6.3.
1. Install Lug Ring (piece 20) onto Drive Sleeve (piece 25) followed by the Worm Gear (piece 21).
Ensure that the worm gear lugs engage with recesses on lug ring.
2. Install Spirolox Retainer (separate layers of retainer sufficiently to begin threading the retainer into
the drive sleeve groove. Continue threading until the retainer is firmly located in the groove).
3. Install Key (piece 23) and Clutch Sleeve (piece 19).
4. Add the Declutch Spring (piece 24), Bevel Gear (piece 18), Upper Bearing (piece 17), and Lower
Bearing (piece 16) to complete the assembly.
5. Replace the drive sleeve assembly into main housing, and secure with the Housing Cover
(piece 27). Ensure that all the seals are in place.
6. Insert Wormshaft Assembly (piece 15) into the housing and locate the bearings in the housing
journals. Replace the Wormshaft Cap (piece 5).
7. Install the Wormshaft Gear (piece 35) and Flex Loc Nut (piece 37).
NOTE: It is recommended that a new flex loc nut be used during reassembly.