SMB/SB Installation and Maintenance Manual 140-11000 • July 20037-28
Flow Control Division
Limitorque Actuation Systems
Table 7.3 – SMB-0 through SMB-4 and 4T Parts List (continued)
Piece Quantity Description
192 1 Thrust Bearing
193 1 Socket Head Shoulder Screw
194 1 Key (SMB-4 only)
195 1 Key
196 1 Hex Head Cap Screw
197 1 Lockwasher
201 1 Handwheel Shaft Spacer
203 1 Socket Head Set Screw
206 1 Clutch Tripper Insert
7.4 SMB-5 (thrust and torque) and SMB-5T (torque only)
a WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before proceeding with
disassembly.
7.4.1 SMB-5 and SMB-5T Disassembly
Piece numbers refer to Figures 7.13, 7.14, and 7.15.
1. Remove Drive Sleeve Locknut (piece #130).
CAUTION: The SMB-5 drive sleeve locknut has left-hand threads and must be rotated clockwise to remove.
2. Rotate the Handwheel (piece #10) to close valve, causing the Stem Nut (piece #127) to rise up the threaded valve stem until the
stem nut splines are free of the Drive Sleeve (piece #126).
3. Rotate the Stem Nut (piece #127) by hand for the remaining length of the valve stem and remove.
4. Remove the Limit Switch Compartment Cover (piece #12) and disconnect all external electrical leads to the actuator.
NOTE: Ensure all motor and control leads are labeled for reassembly.
5. Remove the actuator from the valve if required to facilitate disassembly.
6. Disconnect motor leads and leads between the Torque Switch (piece #116) and Geared Limit Switch (piece #117).
7. Remove Torque Switch (piece #116) and Geared Limit Switch (piece #117).
8. Remove Handwheel Washer (piece #60) and remove the Handwheel (piece #10) and the Handwheel Clutch (piece #13) from the
Handwheel Shaft and Pinion (piece #40).
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