Technical Specifications

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16 | GE Oil & Gas
G. Install cap screws (86) and nuts (87). Torque tighten to
50 in. lbs. in a criss-cross pattern. As this will tend to
unload the tension bolts (96) repeat torque tightening
of tension bolts and cap screws (86) to 50 in. lbs. in
a criss-cross pattern until joint is evenly loaded to
specified torque values.
H. Reconnect air supply.
I. Stroke actuator to confirm operation. 3.6.2 Model 33 size
AC actuators only. Refer to section 3.6.1 for sizes B & C.
3�6�2 for size AC actuators�
3�6�2�1 Disassembly
A. Relieve actuator pressure and disconnect air supply. Do
not remove pivot pin (39).
B. Verify that all three tension bolts (95) and nuts (96) are
in place and secure.
C. Remove nuts (87) and cap screws (86) following a criss-
cross pattern.
D. Verify actuator stem (15) and rod end (94) are securely
connected to lever (32) through pivot pin (39) and that
retaining clips (40) are in place.
E. Loosen tension nuts (96) evenly in sequence. Do
not exceed three turns of any one nut (96) before
proceeding to the next one. Do not vary the sequence.
Failure to evenly unload tension nuts may
result in personal injury!
F. Continue loosening tension nuts (96) until further
loosening of the tension nuts (96) is no longer
accompanied by an increase in separation of the upper
diaphragm case (84) from the lower case (91). At this
point the tension nuts (96), bolts (95) and warning plates
(97) can be removed.
G. Remove the upper diaphragm case (84) and diaphragm
(85).
The diaphragm plate (88) remains under spring load.
3�6�2�2 Reassembly
A. Ensure that sealing surfaces of diaphragm cases (84)
and (91) are clean and free of any dirt or debris. Check
that there are no foreign objects that may interfere
with travel or damage diaphragm.
B. Install diaphragm (85) on diaphragm plate (88). Align
bolt holes with holes in lower case (91).
C. Install three tension bolts (95) with warning plates (97)
into upper case (84). Ensure bolts are equally spaced
around the circumference of the case.
D. Mount upper case (84) onto diaphragm plate (88) such
that the tension bolts pass through holes in diaphragm
(85) and lower case (91).
E. Install tension nuts (96) finger tight onto tension bolts
(95).
F. Tighten each tension nut (86) three turns before
proceeding to the next to ensure actuator spring (90)
is evenly loaded. Continue until the diaphragm is firmly
sandwiched between the flanges of the upper and
lower diaphragm cases. Torque tighten tension bolts to
50 in. lbs.
G. Install cap screws (86) and nuts (87). Torque tighten to
50 in. lbs. in a criss-cross pattern. As this will tend to
unload the tension bolts (95) repeat torque tightening
of tension bolts and cap screws (86) to 50 in. lbs. in
a criss-cross pattern until joint is evenly loaded to
specified torque values.
H. Reconnect air supply.
I. Stroke actuator to confirm operation.
CAUTION
CAUTION
WARNING
DANGER