Masoneilan 51/52/53 Series Cylinder Actuator | 35
Copyright 2021 Baker Hughes Company. All rights reserved.
Model 53 O-ring, Guide Ring and Rod Scraper Replacement -
Air-to-Retract Without 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. Shut off the air supply to the actuator, and isolate the process pressure from the valve.
2. Remove the Indicator Arm (23), Split Clamp (22), Hexagon Bolts (24) and Spring Lock Washers (25) (Figure
10 on page 22).
3. Remove the Hexagon Nuts (20), Spring Lock Washers (29), and Center Bolts (19). Disassemble the Hex Nuts
(20) in small increments using an alternating diagonal pattern to slowly relieve the spring tension.
4. Remove Top Plate (17), Spring Tube (7), and spring unit.
5. Remove Separator Plate (13), Cylinder Tube (14), O-ring (21), Guide Ring (16).
6. Remove Piston Subassembly (31).
7. Replace O-ring (33) and Rod Scraper (34) with new parts. Coat the O-ring and Rod Scraper with silicone
grease (or equivalent).
8. Replace Piston Subassembly (31).
9. Replace O-ring (21) and Guide Ring (16) with new parts. Coat the O-ring and Guide Ring with silicone
grease (or equivalent).
10. Replace Cylinder Tube (14) and Separator Plate (13). Coat silicone grease on the inner surface of the
cylinder tube.
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).
Ensure that guide bushing inner surface (8) is not scratched by compression nut (12).
