SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
7.1.2 SMB-000 Reassembly
CAUTION: Read gasket instructions before replacing gaskets.
To reassemble, follow the disassembly procedure in the reverse order noting the following:
• Step 20 of Disassembly procedure—orient the Declutch Fork (piece #9) on the Declutch Shaft (piece #40) as shown
in Figures 7.1 and 7.2.
• Step 19 of Disassembly procedure—reinstall Thrust Washer (piece #41), Thrust Collar (piece #42), Belleville Springs
(piece #49), and spacers exactly as removed.
• Step 18 of Disassembly procedure—replace Flexloc Nut (piece #78) with the exact number of turns used to remove.
Adjust Clutch Trippers
1. Loosen lock screw on Tripper Adjustment Arm (piece #26).
2. Hold down Declutch Lever (piece #7). Lift Tripper Adjustment Arm up to touch Trippers (pieces #28 and 29). Tighten lock screw
on Tripper Adjustment Arm.
3. Rotate Worm Shaft Gear (piece #22) to ensure actuator shifts into motor operation automatically.
4. Declutch actuator again and repeat Step 3.
7.1.3 To Replace the Stem Nut Only
a WARNING: Do not remove the Locknut (piece #30) with actuator under load or with the valve under pressure.
CAUTION: If valve must be left in service while the stem nut is replaced, the valve stem must be locked in such a way as to
prevent any movement of the valve stem.
1. Remove Locknut (piece #30). The locknut is staked in two places; locate the stakes and spot with a drill.
2. Clean all metal particles.
3. Lift Stem Nut (piece #11) out of the top of the actuator.
If the actuator is mounted on a valve having a threaded stem and stem nut removal is required, proceed as follows:
1. Remove the Locknut (piece #30).
2. Rotate the Handwheel (piece #5) to close the valve.
3. When the stem nut splines are free from the Drive Sleeve (piece #8), the Stem Nut may be rotated by hand for the remainder of
the length of the valve stem and replaced, if necessary.
7-2
Flow Control Division
Limitorque Actuation Systems
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