Technical Specifications

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14 | GE Oil & Gas
The upper diaphragm case (84) should
separate from the lower case (91) as the
tension nuts are loosened the three turns�
If it does not, before proceeding, separate
the upper diaphragm case (84) by tapping
it around the circumference or inserting a
screwdriver between the upper (84) and lower
case (91)� If the cases still do not separate,
check that the actuator stem is not hung
up inside the bracket� DO NOT PROCEED
WITH DISASSEMBLY UNLESS THE CASES CAN
SEPARATE FREELY�
H. Continue loosening the tension nuts (95) evenly
approximately three turns each time ensuring that
the upper diaphragm case (84) and diaphragm (85)
continue to separate.
Note: Continue Step H until the tension nuts (95)
can be easily removed by hand indicating the upper
diaphragm case (84) is not under spring tension.
I. Remove tension bolts (95) and upper diaphragm case
(84).
J. Remove diaphragm (85) and diaphragm plate
subassembly from the actuator.
K. Remove retaining clip (78). Remove clevis pivot pin (79).
Inspect for damage and/or wear in clevis (80), lever (32),
clevis pins (79, 39) and rod end bearings (94). Replace if
necessary.
L. Clean all mating/sealing surfaces which will come in
contact with the diaphragm (85).
3�4�2�2 Reassembly
A. Connect rod end bearing (94) to diaphragm plate clevis
(80) by installing clevis pin (79) and retaining clips (78).
Ensure that the stem is installed such that the wrench
flats are at the end furthest from the diaphragm plate
(88).
B. Ensure spring (90) and spring guide (98) are properly
aligned in lower case (91) and install the diaphragm
plate and stem subassembly. Replace diaphragm (85).
C. Align marks for correct orientation of upper case (84)
and lower case (91). Replace upper diaphragm case (84)
and install long cap screws (95), warning plate (97) and
tension nuts (96).
Note: These bolts must be spaced as equally as
possible.
D. Take up tension nuts (96) evenly and sufficiently to
allow installation of short cap screws (86) and hex nuts
(87).
E. Tighten tension nuts (96) and then tighten all hex nuts
(87) using a criss-cross tightening pattern.
Note: Nuts should be tightened only enough to seal
the diaphragm between the upper and lower case. Do
not overtighten.
F. Connect rod end bearing (94) to lever (32) by installing
pivot pin (39), and retaining clips (40).
G. Replace covers (44 & 46) and reconnect signal and
supply lines.
H. Place back in service and, if so equipped, rotate
handwheel to desired position.
3�5 Handwheel Subassembly
3�5�1 Model 33 sizes B & C only� Refer to section 3�5�2 for
size AC actuators�
3�5�1�1 Disassembly
Turn handwheel to disengage position before
proceeding with handwheel maintenance�
Refer to Figures 13 through 16�
A. Remove retaining clips (63) and push out pin (66). Make
sure bushing (65) remains in the arm (64).
B. Remove the pivot pins (72) and remove handwheel
subassembly.
C. Remove handwheel shaft subassembly (55) retaining
ring (59) and unscrew nut (58). Remove needle bearing
and race (60). Clean and check needle bearing and race
for signs of wear. Replace if necessary.
D. Remove handwheel pivot (56) and thrust washer (61).
Check washer and replace if necessary. Check 0-ring
(57) and replace if necessary.
E. Clean ACME threads on handwheel (54) and shaft S/A
(55) and grease with Molykote G.
3�5�1�2 Reassembly (Figure 5)
A. Install thrust washer (61) and 0-ring (57). Apply silicone
lubricant sparingly to 0-ring.
B. Slide handwheel pivot (56) onto the handwheel
subassembly. Lubricate and install bearing race, needle
bearing and outer race.
C. Install nut (58) bevel side toward bearing race and
screw down tight. DO NOT OVERTIGHTEN. Replace
retaining ring (59). Correct assembly should have the
nut (58) touching the retaining ring (47).
CAUTION
CAUTION
WARNING
DANGER
CAUTION
CAUTION
WARNING
DANGER