CYLINDER SEAL REPLACEMENT
5.0 Cylinder Seal Replacement
5.1 Disassembly
5.1.1 Disconnect pneumatic and electrical supply connections. For spring return actuators, ensure that the actuator is in the failed
position (i.e., at end of the spring stroke).
5.1.2 Remove stop bolt nut (33).
5.1.3 Loosen stop nut (31) and remove stop bolt (32).
5.1.4 Remove tie rod nuts (34) from the tie rods (22).
5.1.5 Remove bottom flange (21).
5.1.6 Remove cylinder tube (19).
5.1.7 Remove housing cover bolts (16), center body cover (15) and cover gasket (14).
5.1.8 Remove piston retaining nut (35) and separate piston (23), shoulder washer (30), and o-ring (36) from piston rod (20).
5.1.9 Remove o-ring (25) and sliding ring (24) from piston (23).
5.1.10 Remove piston rod (20) by unscrewing it from the guide block (4).
5.1.11 Remove flange retaining bolts (13) and remove head flange (18).
5.1.12 Remove head flange and bottom flange o-rings (26).
5.1.13 Remove bolts (38) and shaft seal retaining flange (37) from the head flange (18).
5.1.14 Remove o-ring (28) and shaft seal (29).
5.1.15 Clean all sealing surfaces.
5.1.16 Coat new o-rings, seals and gaskets with grease.
5.2 Assembly
5.2.1 To reassemble the actuator, follow the disassembly procedure in reverse order.
5.2.2 Reconnect power gas supply lines to the actuator.
5.2.3 Cycle the actuator several times. Movement should be smooth and continuous. If not, refer to Section 6, Fault Detection.
Page 7 of 12
INSTALLATION AND MAINTENANCE
GP RANGE
Publication F130E
Date of issue 04/08
FT. LBSNMBOLT SIZE
RECOMMENDED TIGHTENING TORQUE
8.5
20
40
55
110
220
430
425
585
785
1,250
1,400
1,750
6
15
30
40
81
162
317
313
431
579
921
1,030
1,290
M6
M8
M10
M12
M14
M16
M20
M22
M24
M27
M30
M33
M36
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