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4.4.2 PA
-N 540 & PA-N 1080 with Manual Control
Proceed as follows to dismantle the actuator:
• Bring the manual control into the zero position (stroke indicator on housing (36 & 39) between the
grooves on the manual control supports (43)) .
• Unscrew the cheese-head screws (42) and move the leadscrew (40) upwards.
• With SO operation: Loosen the setscrew (38) so that the thread of the ring (37) is visible. Unscrew the
ring (37) from the spindle (35).
• With SC operation: Connect the air pipe to the lower casing (12). Move the actuator into the central
position using air pressure.
Danger: Ensure that compressed air cannot escape accidentally from the actuator. A pressure
drop can cause compression when removing the ring (37).
Loosen the setscrew (38) so that the thread of the ring (37) is visible. Unscrew the ring (37) from the
spindle (35). Depressurise the actuator once more by reducing the air pressure. Disconnect the air pipe
from the actuator (see Chapter 4.3).
• Remove the short hexagonal screws (19) from the housing.
• Loosen the hexagonal screws (18) evenly until the preload on the pressure springs (14 and/or 15) is
dissipated completely. Then remove completely together with the ring (17 only PA
-N 1080).
• With SO operation: Remove the upper casing (12). Remove the spindle assembly together with screwed
parts (1 – 6 + 8 + 35) from the lower casing (12). Take the ring (13) and the pressure springs (14 and/or
15) from the lower casing (12). Should the guides (10) and/or screw connectors (11) need to be
renewed, unscrew the screw connector (11 & 34 for PA
-N 1080 at the top) from both casings and remove
the guides (10) from the casings (12).
Dismantling the spindle together with screwed parts (1 – 6 + 8 + 35) (Necessary when changing the O
ring (3) or changing the mode of operation): Loosen the setscrew (8) so that the spindle thread (35) is
visible. Unscrew the spindle (35) on the spindle (1). Remove the washer (6), diaphragm (5), disc (4), O
ring (3) and bush (2) from the spindle.
• With SC operation: Remove the upper casing (12), the pressure springs (14 and/or 15) and the ring (13).
Remove the spindle assembly together with screwed parts (1 – 6 + 8 + 35) from the lower casing (12).
Should the guides (10) and/or screw connectors (11) need to be renewed, unscrew the screw connector
(11 & 34 for PA
-N 1080 at the top) on both casings and remove the guides (10) from the casings (12).
Dismantling the spindle together with screwed parts (1 – 6 + 8 + 35) (Necessary when changing the O
ring (3) or changing the mode of operation): Unscrew the setscrew (8) so that the spindle thread (35) is
visible. Unscrew the spindle (35) from the spindle (1). Remove the bush (2), O ring (3), disc (4),
diaphragm (5) and washer (6) from the spindle.
Proceed as follows to fit the actuator:
• Clean all parts and inspect for damage. If necessary, rework the parts or replace with original parts.
• If necessary, insert the guides (10) into the casings (12). Secure with screw connector (11 & 34 for PA
-N
1080 at the top).
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