Flowserve L120-190 through L120-2000 - Manual (Page 27)

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Limitorque ® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
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Piece numbers refer to Figures 8.1, 8.2 and 8.3 for L120-190 and -420, and Figures 8.4, 8.5 and 8.6 for L120-800.
If the Stem Nut (piece #12) is to be removed from the assembled actuator, remove the Lock Nut (piece #39) and
lift out top of nut.
1. The Lock Nut (piece #39) is staked in two places. Locate the stakes and spot with a drill.
2. Clean all metal particles and remove.
3. If the actuator is mounted on a valve having a threaded stem, and removal of the stem nut is required,
perform Step No.1 and rotate the handwheel to close the valve.
4. The stem nut will rise up the threaded valve stem. When the stem nut splines are free from the drive sleeve,
rotate the stem nut by hand the remaining length of the valve stem.
5. Replace if necessary.
6. Install the new stem nut with the lock nut.
7. Stake the top threads of the lock nut in two places.
8.1.2 L120-190, 420, 800 Disassembly
Piece numbers refer to Figures 8.1, 8.2 and 8.3 for L120-190 and -420, and Figures 8.4, 8.5 and 8.6 for L120-800.
1. Turn off power to the actuator.
2. Open or remove electrical Compartment Cover (piece #200-1).
3. Disconnect all electrical leads from the Torque Switch (piece #300) and Geared Limit Switch (piece #305).
Ensure that all leads and terminals are clearly marked to facilitate reassembly.
4. Remove two screws holding limit switch and one holding torque switch. Remove both items.
5. Remove four bolts holding Motor (piece #124) and three bolts holding conduit Nipple Flange (piece #26).
Remove motor, drawing motor leads through the conduit opening.
6. Replace Motor Pinion (piece #31). The motor pinion is keyed to the motor shaft and held there with a
setscrew and lockwire to retain the pinion in its proper position. The motor pinion should be shouldered on
the motor shaft.
7. Remove Handwheel (piece #5) by loosening setscrew. Handwheel can then be pulled from Handwheel Shaft
(piece #18).
8. Remove Declutch Lever Subassembly (piece #11) by removing Extension Spring (piece #48), Retaining Ring
(piece #53-4), Declutch Link (piece #10), and two hex head cap screws holding the subassembly in place.
Remove subassembly.
9. Remove Spring Cartridge Cap (piece #4).
10. Remove Worm and Torque Spring Subassembly (piece #13, #30-1) completely. Temporarily replace the
handwheel and then rotate in the close direction to cause the worm to screw out of engagement with worm
gear and cause the torque spring cartridge to emerge from Housing (piece #1). See Step No. 21 to further
disassemble the cartridge.
11. Remove Housing Cover (piece #3).
c WARNING: Do not remove if a thrust load is on the actuator or if the valve is under pressure and not fully
open, as personal injury may result.