Marwin Valve UT Series Pneumatic Actuators - Manual (Page 3)

5. Before starting the disassembly, verify by the stamped marking on the body if the actuator is double acting (DA)
or spring return (SR).
For DOUBLE ACTING actuator:
6. Slowly remove the end caps screws (22) from each end cap (19,20) using a diagonal pattern.
FOR SPRING RETURN actuator:
7. Slowly disengage the bolts (20) part way from each end cap (18 and 19), to allow the springs to fully uncom-
press. Unscrew the bolts 0.38" to 0.5" at a time in a diagonal patter, and repeat the sequency until the springs
are fully uncompressed.
8. Remove the end caps (19,20).
9. Remove the snap ring (10) from its place on the pinion (2).
10. Remove pinion washer (9).
11. Remove the cam (7) and spacer ring (6).
12. Rotate the actuator body (1) in a clockwise direction in respect to the pinion (2), so that the pistons move to-
wards body ends. Now it is possible to remove the two pistons.
13. Carefully remove pinion (2) from the body (1).
Actuator Parts
22
14
15 1 16
4
2
3
5
21
19
17
11
14
12
13
22
17
18
20
21
13
12
11
8
10
9
7
6
18