SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
7.2 SMB-00
a WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before proceeding
with disassembly.
7.2.1 SMB-00 Disassembly
Piece numbers refer to Figure 7.4 to 7.7.
1. Verify power to the actuator is OFF.
2. Remove or swing open the Limit Switch Compartment Cover (piece #2).
3. Disconnect the leads of the Geared Limit Switch (piece #85) leads and the Torque Switch (piece #83). 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 Assembly (piece #84) and guide the motor
leads through the conduit opening.
NOTE: The Motor Pinion (piece #20) is keyed to the motor shaft and held there with a set screw to retain the pinion in its proper
position.
6. Depress Declutch Lever (piece #5) to put the actuator in manual operation.
7. Remove Declutch Lever.
8. Remove Spring Cartridge Cap Cover (piece #25).
9. Remove Spring Cartridge Cap (piece #3).
10. Pull the Worm (piece #19) and Belleville Spring assembly (piece #46) directly out.
11. Remove Tripper Lever (piece #10) assembly.
NOTE: A hex head cap screw locates and secures the Tripper Lever on the Declutch Shaft (piece #34) (end of shaft should be flush
with tripper lever).
12. For the top-mounted handwheel, remove the Housing Cover (piece #88) and the Handwheel (piece #89) assembly.
13. For the side-mounted handwheel, remove the Bevel Gear Housing (piece #96) and the entire handwheel assembly—including the
Bevel Gear Cartridge (piece #98).
14. Remove the Drive Sleeve Assembly completely, including pieces #4, 7, 8, 12, 14, 28, 29, 30, 43, 64, and 66. Press off the Lower
Roller Bearing Cone (piece #66). Slide off all remaining pieces except Geared Limit Drive Hypoid Gear (piece #12) and Roller
Bearing Cone (piece #64).
15. Remove the Locknut (piece #73) and remove the Worm Shaft Gear (piece #18).
16. Remove the Tripper Cam (piece #24), Bearing Spacer (piece #31), and Cam Spacers (piece #36).
17. Remove the Worm Shaft (piece #17) and Worm Shaft Bearing Cap (piece #35).
18. Remove the internal Retaining Ring (piece #71). Remove Worm (piece #19) from worm assembly.
19. Remove the Locknut (piece #74) counting the number of turns needed to remove, and Belleville Spring (piece #46).
NOTE: Count the number of turns to remove the Locknut. Needed for reassembly.
20. Remove the Thrust Washer (piece #39), Torque Limit Sleeve (piece #32), Belleville Spring (piece #46), and Thrust Washer
(piece #38). Note the orientation for the torque spring discs, spacers, and thrust washers.
21. Remove the Retaining Ring (piece #70) on the opposite side of the actuator from the motor. Pull the Declutch Shaft (piece #34)
and the Declutch Fork (piece #6) out of the actuator from the motor side of the actuator.
22. Press off the Upper Roller Bearing Cone (piece #64). Slide the Geared Limit Drive Hypoid Gear (piece #12) off the Drive
Sleeve (piece #4).
7-9
Flow Control Division
Limitorque Actuation Systems
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