Flowserve SMB Series Electric Actuators - Manual (Page 58)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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2. Rotate the Handwheel (piece #5) to close the valve.
3. When the stem nut splines are free from the Drive Sleeve (piece #11), the Stem Nut may be
rotated by hand for the remainder of the length of the valve stem and replaced, if necessary.
4. On new stem nut, stake the top threads in two places. Install stem nut.
To reinstall 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.
To reinstall the Stem Nut onto a Threaded Shaft:
1. Rotate the Stem Nut on the shaft until the Stem Nut splines engage the Drive Sleeve splines.
2. Rotate the Handwheel to open the valve until the Stem Nut is seated.
3. Install the Locknut.
4. Stake the top threads in two (2) places, 180° apart.
See Gasket Instructions on next page.
7.3.2 SMB-0, 1, 2, 3 and 4 Disassembly
Piece numbers refer to Figures 7.9 to 7.11.
1. Verify power to the actuator is OFF.
2. Remove or swing open the Limit Switch Compartment Cover (piece #6).
3. Disconnect the Geared Limit Switch (piece #105) leads and the Torque Switch (piece #104)
leads. Verify the leads are marked for reconnecting to the terminals.
4. Remove the two screws each on the geared limit switch and the torque switch. Remove the
Geared Limit Switch and the Torque Switch.
5. Disconnect the motor leads inside the limit switch compartment. Remove the Motor (piece #103)
and guide the motor leads through the conduit opening.
NOTE: The Motor Pinion (piece #40) is keyed to the motor shaft and held there with a set screw and
lockwire to retain the pinion in its proper position. The motor pinion should be shouldered on the
motor shaft.
6. Depress Declutch Lever (piece #10) to put the actuator in manual operation.
7. Loosen set screw and pull Handwheel (piece #5) and Spacer (piece #201) from Handwheel Shaft
(piece #25).
8. Loosen set screw and slide Declutch Lever (piece #10) from Declutch Shaft (piece #24).
9. Remove Spring Cartridge Cap (piece #4).
a CAUTION: The Declutch lever shaft must be held in position and not allowed to be pulled out
when removing the spring cartridge cap. A loud snap will be heard on removal of this end
cap—this is the sound of the Torsion Spring (piece #54) being released. Do not be alarmed. Later
models have declutch lever shaft held in place by a snap ring located behind the Declutch Link
(piece #9).