E N G I N E E R E D & P R O C E S S V A L V E S
07/2011 / IOM-GEN-TWIN-03
19
Installation, Operation and Maintenance Manual
OPERATOR ASSEMBLY
1.
Place one of the two bearings (27) on upper stem (4). NOTE: This bearing is assembled such that the wide surface of the inner race
seats on the upper stem shoulder. Install a retaining ring (43) to lock the bearing in place.
NOTE: The retaining ring comes against
narrow surface of inner race.
2.
Apply liberal coat of grease to all surfaces of the upper stem below the bearing. Thread the upper stem (4) into the lower stem
(3) such that stop pin (5) in the upper stem comes against the shoulder at the TOP of the lower stem and the detent recess in
upper stem is exactly in line with the roller opening in lower stem. This operation may require several attempts as the threads are
multiple start and do not always assemble correctly with the first try.
3.
Install the indicator shaft assembly (12) up through both stems. Align the detent hole in the indicator disc with the threaded hole
in the lower stem and fasten with set screw (38). Set screw must be below the outside surface of the lower stem.
4.
Install O-Ring (22) in housing (1).
5.
Place roller (20) in opening of lower stem. A liberal application of grease will hold it in position.
6.
Place the stem assembly into the housing–taking care that roller is aligned with roller groove in housing. Push entire assembly down
until bearing rests on shoulder in housing.
7.
Apply a smooth even coating of Form-a-Gasket
®
to surface of guide pin boss on housing (1).
8.
Insert guide pin (14) to full engage slot in lower stem and secure with capscrews (31).
9.
Place gear key (19)
10. Install tapered roller bearing cup (28) in rear bearing recess of gear housing (2) with large diameter of taper facing out.
11. Install tapered roller bearing cup (28) and cone (26) on handwheel end of worm shaft (7). Place bearing cone (26) on opposite end
with large diameter of taper against shaft shoulder.
12. Install worm shaft in gear housing. Make certain that rear bearing cone has properly entered rear bearing cup (28).
13. Install O-Ring (21) in bearing cap (8).
14. Apply a smooth even coating of Form-a-Gasket
®
to bearing cover boss on gear housing. Fasten bearing cap (8) in place with
capscrews (32). Be sure to install the plastic shims between gear housing and bearing cap.
15. Install worm gear (6) in gear housing with hub down (toward smaller opening).
16. Apply Form-a-Gasket
®
to top flange of operator housing (1). Place gear housing (2) with assembled parts on top of operator
housing guiding worm gear keyway over key (19) in upper stem (3).
17. Install retaining ring (43) to secure worm gear (6).
18. Fasten gear housing (2) to operator housing (1) with capscrews (35).
CAUTION: NOTE THAT THE SHORT CAP SCREW (33) IS
INSTALLED DIRECTLY UNDER THE CENTER OF THE WORM SHAFT (7).
19. Fill gear housing (2) with grease up to top of worm gear.
20. Install bearing (27) in bearing carrier (10).
NOTE: The widest surface of the outer race goes against the shoulder in the
bearing carrier.
21. Apply a smooth even coating of Form-a-Gasket
®
over top surface of gear housing (2).
22. Place bearing carrier (10) on top of gear housing (2). Install two capscrews (36) 180° apart to temporarily align the bearing carrier.
They need only be partially screwed in.
23. Install lock nut (16) on upper stem and tighten snug with a wrench. Remove the two capscrews (36).
24. Install the grease seal (25) in the gear housing cover (9). Slide the cover over the indicator shaft (12) and secure to top of
gear housing (2) with capscrews(36).
25. Install stem protector (24).
26.
Install indicator (11) and secure with socket head capscrew (39).
