IMO 11/19
8
IMO-553 EN
F. Press the two pistons (40) simultaneously into the
body (50) until the piston racks are engaged and
rotate the body clockwise (if viewing the bottom of
the actuator), or counter-clockwise (if viewing the
top of the actuator), until the stroke is completed.
G. To ensure that the piston (40) teeth are evenly
engaged, fully compress both pistons (40) inward
and measure the distance from the edge of the
body to the piston (40) face on each side, shown
as dimension “A” in (Figure 12). If a different value
is obtained on each side, remove the pistons and
repeat from step 2d.
H. Temporarily install the position indicator (19) onto the
shaft (60) to determine whether the correct stroke is
obtained, Verify that the slot in the top of the position
indicator (19) will rotate a minimum of 5° beyond the
90° vertical centerline of the actuator body (50) and
a minimum of 5° beyond the 0° horizontal centerline
of the actuator body as shown in (Figure 13). If the
proper stroke is not obtained, remove the pistons
and repeat from step 2d. Once the proper stroke is
verified, remove the position indicator (19).
5°
Figure 13
3. End Cap (30) and Spring Cartridge (17) Assembly,
(Figures 14 through 16):
A.
For spring-return actuators, insert the proper
quantity of spring cartridges (17) according to the
pattern shown in (Figure 14) (referring to the total
number of springs).
17
50
Figure 15
B. Apply grease to the end-cap o-ring seals, using the
recommended o-ring-area grease listed in (Table 2).
Fit the end-cap o-ring seals (14) into the groove in
each end cap (30, 31).
C. Fit the end caps (30) onto the body (50), verifying
that the o-ring seals (14) remain in the grooves.
D.
Insert all end-cap screws (13) and hand tighten.
Complete tightening by following the sequence
indicated in (Figure 16), using torques listed in Table 4.
Figure 14
