Reassembling Actuator
1. Scrape old gasket material from the actuator housing and the adapter, install a new gasket, then
fasten the adapter to the actuator housing with the screws.
2. Line up the scribe marks on the valve and adapter made during actuator removal, then set the
adapter and housing on the valve.
3. Fasten the adapter to the valve.
4. Drive the pin through the rack bearing and actuator housing (if replacing worn bearing).
5. Apply a liberal amount of grease to the rack teeth and the back of the rack, which will contact
the rack bearing, then install the rack in the housing.
6. Apply a liberal amount of grease to the gear sector teeth and journals, then place the gear
sector in the housing and carefully align the teeth with the rack as marked during disassembly..
NOTE: It may be necessary to loosen the adapter mounting screws and move the housing a small
amount to align the gears. Be sure to retighten the mounting screws after aligning the gears.
7. Install the cylinder/rack rod assembly by sliding the rack rod through the rack then fasten the
cylinder to the housing.
If the rack rod is not attached to the cylinder, clean the threads of both the rack rod and
NOTE:
the cylinder shaft, then apply Loctite to the cylinder shaft threads and screw the rack rod onto
the cylinder shaft.
8. Slide the spacer, spring washers and nuts onto the rack rod. See Table E for spring washer
placement.
9. Screw one nut onto the rack rod until the spring washers are completely compressed, then
loosen the nut just until the washers return to normal shape.
10. Screw the other nut onto the rack rod and tighten the two nuts against each other.
11. Set a new cover gasket on the housing, then install and fasten the top cover on the housing;
make sure the scribe marks line up.
12. Slide the pointer and wrenching nut down the plug stud so it rests on top of the gear sector; the
pointer should point to indicate the correct valve position.
13. If the valve is 24–36" (600–900mm), hold the keys in position when you slide the wrenching nut
over the plug stud, and guide the keys into the gear sector and stem slots. Then install the four
screws fastening the wrenching nut to the gear sector.
14. Place the spring washers on the plug stud as shown in Figure 5.
15. Screw the lock nut down the plug stud until it is tight and the spring washers are completely
compressed, then back the nut off one full turn.
16. If the valve is 24–36" (600–900mm), tighten the #2 lockscrews and then the #1 lockscrews to
hold the keys in place. Skip this step if the valve is 4–20" (100–500mm).
17. Replace the extension cap. On units with booster cylinders, replace the booster cylinder or
cylinders.
18. Adjust the open and closed position stops. See "Position Stops" section.
August 2012
(Continued)
Page 15
Cylinder Operated G-Series Actuator
DeZURIK
D10022
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