SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 7-19
Flow Control Division
Limitorque Actuation Systems
Table 7.2 – SMB-00 Parts List (continued)
Piece Quantity Description
157 1 Socket Head Cap Screw
158 1 Lockwasher
159 1 Lockwasher
160 1 Round Head Machine Screw
162 1 Flat Head Socket Cap Screw
165 1 Socket Head Set Screw
167 1 Lockwasher
168 1 Key
169 1 Key
173 1 Hex Head Cap Screw
174 1 Stud
175 1 Hex Nut
176 1 Lockwasher
177 1 Socket Head Set Screw
178 1 Key
7.3 SMB-0, 1, 2, 3, 4, and 4T
a WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before proceeding
with disassembly.
7.3.1 SMB-0, 1, 2, 3, 4, and 4T 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).
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).
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