Masoneilan 51/52/53 Series Cylinder Actuator | 33
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Model 53 O-ring and Guide Ring Replacement - Air to Retract with Handwheel
During assembly or maintenance, and under operation in some conditions the operators or
technicians must be alert and aware of all possible pinch points or areas where there are moving or
sliding components.
1. The handwheel must be in the AUTO position (see "Switching from Manual Operation to Auto Operation
Mode” on page 15).
2. Shut off the air supply to the actuator, and isolate the process pressure from the valve.
3. Remove the Indicator Arm (23), Split Clamp (22), Hexagon Bolts (24) and Spring Lock Washers (25) (Figure
10 on page 22).
4. Remove the Hexagon Nuts (20), Spring Lock Washers (29), and Center Bolts (19).
5. Remove Top Plate (17), Spring Tube (7), and spring unit.
6. Remove Separator Plate (13), Cylinder Tube (14), O-ring (21), Guide Ring (16).
7. Remove Piston Subassembly (31)
8. Unscrew Locking Nut (42) and Adjustment Nut (43).
9. Replace O-ring (33) on Piston Rod with new part. Coat the O-ring with silicone grease (or equivalent).
10. Replace Adjustment Nut (43) and tighten locking nut (42).
11. Replace Piston Subassembly (31).
12. Replace O-ring (21), and Guide Ring (16) with new parts. Coat the O-ring and Guide Ring with silicone
grease (or equivalent).
Be careful not to damage the inner surface of the Guide Bushing (8) with the Compression Nut (12)
during disassembly.
Ensure that guide bushing inner surface (32) is not scratched by the Piston subassembly screw (31).
Ensure that guide bushing inner surface (32) is not scratched by the Piston subassembly screw (31).
