Instruction Manual

7
ITEM DESCRIPTION MATERIAL
1 Housing Cast Iron
2 Segment Gear Bronze or DI
3 Worm Alloy Steel
4 Cover Cast Iron
5 Indicator Cast Iron
6 O-Ring Buna-N
7 Thrust Bearing Carbon Steel
8 Bearing Bronze
9 Shaft Carbon Steel
10 Gasket Non-Asbestos
12 Operating Nut Cast Iron
14 Cover Bolt Carbon Steel
15 Indicator Bolt Steel
17 Locating Pin Steel
18 Worm Pin Steel
19 Spring Pin Steel
20 Stop Screw Steel
21 Jam Nut Steel
22 Plug Steel
23 Oil Seal Steel & Rubber
30 Spur Gear Cast Iron
31 Grease EP-2
32 Worm Spacer Steel
8. Reinstall actuator mounting plates. Clean off all
grease from the surfaces of the actuator mounting
surfaces.
9. With valve in the closed position, place actuator
over valve and reinsert key (14).
10. Finally, with valve closed, install cover on actuator
indicating “Closed".
FIGURE 8. GEAR ACTUATOR CONSTRUCTION
TABLE 5. WORM GEAR PARTS LIST
WORM GEAR ACTUATOR MAINTENANCE: A typical
worm gear actuator is shown in Figure 8 and consists
of a worm (3) mounted on an input shaft (9). The
worm engages a segment gear (2). When the worm is
turned, it drives the segment gear through 90 of
rotation. The rotation of the segment gear is displayed
by the top indicator (5). The gears are lubricated with
EP2 grease in a cast iron housing (1). The open and
closed positions of the segment gear (2) are controlled
by the end position stop bolts (20). The stops can be
adjusted by loosening the lock nut (21) and rotating the
bolts (20).
The gearbox is factory lubricated and sealed. No
regular maintenance is required. If difficult operation is
observed, the cover can be removed and the unit
inspected for wear. All moving parts should be coated
with grease. The grease should have an even and
smooth consistency. If needed, coat all moving parts
with an EP-2 grease such as Mobil Mobilux EP2.
Buried units should be packed 90% with grease.
TRAVELING NUT ACTUATOR MAINTENANCE: A
typical traveling nut actuator is shown in Figure 9 and
consists of a threaded nut (12) which travels back and
forth on a threaded stem (14). The stem is lubricated
with EP2 grease in a cast iron housing (1). The nut, in