Masoneilan 51/52/53 Series Cylinder Actuator | 27
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Ensure that guide bushing inner surface (32) is not scratched by Piston subassembly screw (31).
8. Replace O-ring (33) in yoke with new part. Coat the O-ring with silicone grease (or equivalent).
9. Replace Piston Subassembly (31). Coat silicone grease (or equivalent) on the sliding surface of the Piston Rod.
10. Replace O-rings (21) and Guide Ring (16) with new parts. Coat the O-ring and Guide Ring with silicone grease
(or equivalent).
11. Replace Cylinder Tube (14), Separator Plate (69), Volume Chamber Tube (70), Top Plate (17). Coat the inner
surface of the Cylinder Tube with silicone grease (or equivalent).
12. Ensure the positions of the air connections are correct. Insert the Center Bolts into the holes of the Top Plate
and Yoke. Mount the Spring Washers and Nuts and tighten them lightly by hand. Mount the Spring Washers and
Nuts to the bottom side of the Yoke by hand. Ensure that the position of Center Bolts (Approxi25 mm
longer than others) for the accessory mounting plate, if equipped, complies with Figure 11.
13. Align the holes of the Top Plate with the Yoke so that the Center Bolts are set vertically.
14. Ensure balanced tightening of the center bolt by tightening the nuts in diagonal pairs gradually to a torque of 70.0
± 5 N-m (52.0 ± 4 ft-lbs).
Figure 11 - Center Bolt Positioning
