DeZurik G-SERIES Manuel - Page 11

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G-Series Manual Actuator used on BOS Butterfly Valves

Actuator Assembly:

1. Install a new seal (B1J) into the housing (B1A).

2. Slide the drive shaft (B1F) into the housing (B1A) and thru bearing race (B1G), thrust bearing

(B1H), bearing race (B1G), worm (B1D), bearing race (B1G), thrust bearing (B1H) and bearing

race (B1G).

3. Rotate the drive shaft (B1F) until the pin holes in the drive shaft and the worm (B1D) line up.

4. Drive the two pins (B1K) thru the worm (B1D) and drive shaft (B1F).

5. Apply removable thread sealant to the threads of pipe plugs (B1I) and install the pipe plugs flush

or below the surface of the housing (B1A).

6. Apply a light film of grease to a new o-ring (B1N) and insert it into the groove in the bottom of

the housing (B1A).

7. Grease the bearing (B1L) in the housing (B1A) and slide the gear (B1C) into the bearing in the

position noted in Step 7. of the ACTUATOR DISASSEMBLY section.

8. Apply a liberal amount of Lithium based grease such as Shell Alvania EP2 or Mobilux EP2 to

the gear (B1C), bearings (B1L) and worm (B1D).

9. Apply a light film of grease to a new o-ring (B1N) and insert into groove in the cover (B1B).

10. Apply a bead of silicone sealant DOW RTV-732 (1055515) or similar to the housing (B1A) or

cover (B1B) mating surface. Grease the bearing (B1L) in the cover, slide the cover onto the

gear (B1C) and fasten with screws (B1M) to the housing.

11. Insert the drive key into the valve shaft/gear (B1C) keyway.

12. Fasten the pointer (B1Q) to the gear (B1C) with the two screws (B1R) in the position noted in

Step 4. of the ACTUATOR DISASSEMBLY section.

13. Install the actuator on the valve as described in the REPLACING ACTUATOR ON VALVE

Section of this Instruction.

D10465

Page 11

DeZURIK

August 2012