5. Insert the O-Rings (ref. 15), the guide ring (ref. 14) and the thrust block (ref. 5) on the left and
right pistons (ref. 16).
6. Piston insertion: This operation can be performed in two different ways in order to obtain
either a fail clockwise actuator (mounting A - FCW) or a fail counter clockwise actuator
(mounting B - FCCW).
6a. Mounting A (clockwise rotation for close)
Place the pinion in close position and after move counter clockwise about 95º.
Left piston insertion.
• Place the actuator in a stand up position on its right side with the flange facing you
and the supply holes on your right.
• To obtain the counter clockwise rotation (mounting A) it is necessary to insert the
rack of the piston to the left of the pinion.
• Insert the left piston applying pressure with hands until the piston is completely in
the body.
Right piston insertion.
• Place the actuator in a stand up position on its left side with the flange facing you.
• Insert the rack of the piston to the left of the pinion.
• Insert the right piston applying pressure with hands until the piston is completely in
the body.
6b. Mounting B (counter clockwise rotation for close): follow the same steps as above, but
inserting the rack of both pistons on the right of the pinion
7. Actuator positioning phase:
7a. Place the actuator in a stand up position on a flat surface with the upper part of the
pinion on the right side.
7b. Manually apply pressure to the piston, as this will assist to compress the opposite
piston.
7c. While continuing to apply pressure, use a wrench on the appropriate mill of the upper
portion of the pinion and rotate the pinion counter clockwise. At this point there must
be clicking sound due to the interlocking between the piston rack and the pinion tooth.
Make sure to create an individual sound per tooth.
7d. After each individual sound, rotate the pinion clockwise; verify that the pinion Namur
mill is about 10° beyond the perpendicular to the body axis. If problematic, repeat step
7c.
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