SMB/SB Installation and Maintenance Manual 140-11000 • July 20037-20
Flow Control Division
Limitorque Actuation Systems
10. Temporarily replace the Handwheel (piece #5) and rotate in the close direction to cause the Worm (piece #53) to screw out of
engagement with Worm Gear (piece #16) and to cause Torque Spring assembly (pieces #29, 44, 45, 48, 56) to emerge from the
Housing (piece #2). Remove Worm and Torque Spring assembly completely.
NOTE: The cartridge may be further disassembled—remove Elastic Stop Nut (piece #85), noting the number of turns to remove.
11. Remove Housing Cover (piece #3).
12. Remove Drive Sleeve Assembly completely from the actuator Housing (piece #2). The drive sleeve assembly consists of Locking
Nut (piece #30), Stem Nut (piece #20), Drive Sleeve (piece #11), Upper Thrust Bearings (piece #77 and 78), Worm Gear (piece
#16), Worm Gear Spacer (piece #28), and Lower Roller Bearing Cone (piece #75). Press off the Lower Roller Bearing Cone
(piece #75) to further dismantle the drive sleeve assembly.
13. Remove Retaining Ring (piece #89), Split Ring Retainer (piece #27), and Split Ring (piece #47). Pull the Worm Shaft Clutch
Gear (piece #41) from the Worm Shaft (piece #43).
14. Remove Clutch Gear Spacer (piece #46)—only on SMB-0 and SMB-1.
15. Spread Clutch Trippers (piece #32) with a tool to shift the actuator into motor operation.
CAUTION: Do not use hands. Spring forces could cause personal injury.
16. Remove bolts holding Clutch Housing (piece #1) to Housing (piece #2). Withdraw Clutch Housing together with the Trippers
(piece #32), and Declutch Fork (piece #12). Worm Shaft Clutch (piece #50) will slide off Worm Shaft (piece #43).
17. Slide Fork Return Spring (piece #58) off of Worm Shaft toward motor end. Slide Declutch Link (piece #9) off splined Declutch
Shaft (piece #24). Remove Retaining Ring (piece #73).
18. Remove Elastic Stop Nut (piece #84) and remove Handwheel Gear (piece #7), which is keyed to the Handwheel Shaft
(piece #25).
19. Remove bolts holding Worm Shaft Bearing Cap (piece #8) and slide cap off Worm Shaft. Remove Retaining Ring (piece #92),
being careful not to lose Handwheel Pinion Spring (piece #57) and Spring Ring (piece #17). Remove Handwheel Clutch Pinion
(piece #42).
20. Tap on the motor end of the shaft, which will free Bearing (piece #80) from Housing to remove handwheel shaft. Handwheel
Shaft (piece #25) will break free from Bearing (piece #79). Remove Handwheel Shaft (piece #25) from Housing.
21. Withdraw Declutch Shaft (piece #24) from handwheel end of Housing.
22. Remove Thrust Washers (piece #48), Torque Limit Sleeve (piece #29), and Belleville Springs (piece #56).
NOTE: Note the orientation of the Belleville Springs for reassembly later.
23. Locate screw in threaded area of the Bearing Cartridge Stem (piece #45) and remove. Remove Bearing Cartridge Stem.
24. Remove the Worm (piece #53) and the Ball Bearing (piece #82).
25. Locate set screw in Bearing Locknut (piece #83). Remove set screw and Bearing Locknut. Remove the Ball Bearing (piece #82).
7.3.2 SMB-0, 1, 2, 3, 4, and 4T Reassembly
CAUTION: Read gasket instructions before replacing gaskets.
To reassemble, follow the disassembly procedure in the reverse order, noting the following:
• Step No. 22 of Disassembly procedure—stack Belleville Springs (piece #56), Thrust Washers (piece #48), and Spacers in the
exact order as they were removed.
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