SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
7.2.2 SMB-00 Reassembly
CAUTION: Read gasket instructions before replacing gaskets.
To reassemble, follow the disassembly procedure in the reverse order, noting the following:
• Step No. 21 of Disassembly procedure—orient the Declutch Fork (piece #6) on the Declutch Shaft (piece #34) as shown in
Figure 7.3 (exploded view).
• Step No. 20 of Disassembly procedure—reinstall Thrust Washers (pieces #38 and 39), Belleville Spring (piece #46), and
spacers exactly as removed.
• Step No. 19 of Disassembly procedure—replace Locknut (piece #74) with the exact number of turns used to remove.
• Step No. 7 of Disassembly procedure—manually declutch unit and rotate Worm Shaft Gear (piece #18).
Adjust Clutch Trippers
1. Loosen the lock screw on the Tripper Adjustment Arm (piece #21).
2. Hold down the Declutch Lever (piece #5).
3. Lift the Tripper Adjustment Arm up to touch the Trippers (pieces #26 and 27). Tighten the lock screw on the Tripper Adjustment
Arm.
4. Rotate the Worm Shaft Gear (piece #18) to ensure actuator shifts into motor operation automatically.
5. Declutch the actuator again and repeat Step 3.
7.2.3 To Replace the Stem Nut Only
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WARNING: Do not remove the locknut (piece #30) with the actuator under load or with valve under pressure.
CAUTION: If valve must be left in service while the stem nut is replaced, the valve stem nut must be locked in such a way as to
prevent any movement of the valve stem.
1. Remove the 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 the Stem Nut (piece #8) 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 #89) to close the valve.
3. When the stem nut splines are free from the Drive Sleeve (piece #4), the Stem Nut may be rotated by hand for the remainder of
the length of the valve stem and replaced, if necessary.
To re-install the Stem Nut onto the Keyed Shaft:
1. Lower the Stem Nut into the Drive Sleeve, aligning the splines, until the Stem Nut is seated.
2. Install the Key.
3. Install the Locknut.
4. Stake in two (2) places, 180˚ apart.
7-10
Flow Control Division
Limitorque Actuation Systems
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