Installation, Operating & Maintenance instructions
PAGE 8
6.12 Insert the four pistons in the cylinders, keeping the
orientation of the racks so the teeth engage with the
pinion teeth.
6.13 Holding all 4 pistons with both hands as shown, rotate
the body CCW until it stops against the adjustment
screws and all 4 pistons are pulled inside. Make sure
all the 4 pistons have reached the same position in
the cylinder.
6.14 Rotate the body back 90
°
CW to the open position
so the pistons are now almost flush with the actuator
body.
6.15 Rotate the body back and forth to get the pistons
running smoothly in the cylinders.
6.16 Bring the pistons in to the close position and once
again apply grease in the cylinders behind the pistons.
6.17 Apply grease to all the spring sets.
6.18 Push the cover O-rings (7) in the groove of the covers
(8, 9). If needed, replace them with a new set. Notice
that the Namur cover (8A) has an additional small O-
ring (10) that should be in place.
6.19 Lubricate the cover screws (11).
6.20 Assemble the Namur cover first (8A). If this is a SR
actuator, place the spring set in the cover and then
screw the spring cover (8).
6.21 A l w a y s t i g h t e n t h e s c re w s i n s e q u e n c e .
6.22 Assemble the DA covers (9). Make sure the covers
are put back according to your marking during
disassembly.
6.23 Assemble the SR covers with the spring set. The
screws are long enough to engage to the thread
before the springs start to compress. Tighten the
screws in sequence and only two turns at a time.
6.24 Finally torque the screws to the set figures in the table
below.
Actuator Screws Torque Figures
Actuator
Size
C15 - C20
C25 - C30
C35
C45 - C75
Screw
Lb-ft
NM
Lb-in
M5
M8
M10
M12/M16
3.5
9.0
18.0
40.0
2.5
6.5
13.0
30.0
30
80
160
360
cylinders.
6.9
Looking from the top of the actuator, rotate the body
90
°
CW and another 40
°
to bring it to the position
for inserting the pistons.
6.10
Fit the O-rings on the pistons.
6.11
Apply grease in the body cylinders, to the pistons
groove and rack and to the piston O-rings.
6.12
Insert the four pistons in the cylinders, keeping the
orientation of the racks so the teeth engage with the
pinion teeth.
Apply a drop of
Loctite® 221 to the two adjustment
screws that were pulled away and screw them back
until they both touch the stop. Adjust them until you
visually see that the pinion flats are
paralel with the
body plane.
Bottom View
Angle of r
o
tation
+90¡
+40¡
0¡
