DeZurik G-SERIES Instruction - Page 6

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DeZURIK

G-Series Handwheel and Chainwheel Actuators

Disassembling the Actuator

G12 UNITS

1. Shut off line pressure if the actuator is mounted on an installed valve.

2. Remove the actuator cover screws and the actuator cover.

3. Note the position of the gear sector—it must be installed in the same position during

reassembly.

4. Remove the gear sector.

5. Remove the pipe plug in the housing, and drive out the pin that connects the worm gear to the

handwheel drive shaft.

6. Remove the drive shaft, handwheel, and bearing race.

G16 UNITS

1. Shut off pipeline pressure if the actuator is mounted on an installed valve.

2. Remove the actuator cover screws, the actuator cover, the screws and the pointer.

3. Mark the teeth on the gear and rack that are engaged.

4. Remove the four screws that fasten the drive shaft seal housing to the actuator housing.

5. Turn the handwheel to remove the drive shaft seal assembly complete with handwheel and

drive shaft.

6. To disassemble the drive shaft seal housing assembly:

a. To remove the collar and the set screw, and turn the threaded collar out.

Note: Because this collar retains the lower bearing, the bearing will also be removed.

b. To remove the seal housing, remove the handwheel pin and handwheel. Then lift the

seal housing off the shaft.

Note: This will allow access to the top bearing.

c. To remove the sleeve, remove the pin that connects it to the shaft.

7. Remove the gear sector, the rack, the pin and the rack guide.

D10083

Page 6

August 2012