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Baker Hughes
Copyright 2021 Baker Hughes Company. All rights reserved.
Maintenance Procedures
There are different maintenance steps required depending on whether the actuator is double acting, air-to-
extend or air-to-retract.
Model 51 O-ring, Guide Ring Replacement - Double Acting With/Without Handwheel
Actuator action may be checked by referring to the valve identification tag. Model 51 indicates unit
is double acting (no spring) and Model 52 indicates unit is air to extend and Model 53 indicates
unit is air to retract.
Place the actuators in an upright position for all disassembly or assembly operations.
Ensure that guide bushing inner surface (32) is not scratched by Piston subassembly screw (31).
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. T he handwheel must be in the AUTO position (see “Switching from Manual Operation to Auto Operation Mode”
on page 15).
2. Shut off air supply to the actuator, and isolate the process pressure from the valve to prevent plug movement
(Figure 7 on page 19).
3. Disconnect air piping from the Top Plate (17),Separator Plate (69), and check for air pressure in the cylinder.
4. Remove the Hexagon Nuts (20), Spring Lock Washers (29), and Center Bolts (19).
5. For models:
• With Volume Chamber: Remove Top Plate (17), Volume Chamber Tube (70), Separator Plate (69), Cylinder
Tube (14), O-rings (21), Guide Ring (16).
• Without Volume Chamber: Remove Top Plate (17), Cylinder Tube (14), O-rings (21), Guide Ring (16).
6. Loosen Set Screw (55) in Adapter (54) and unscrew Adapter (54) from Spacer Tube (5).
7. Remove Piston Subassembly (31).
