Instruction Manual
D100306X012
657 Actuator (30/30i-70/70i and 87)
June 2018
12
WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1) away from the
actuator, relieve spring compression (step 2, below), and carefully remove casing cap screws (key 22) (step 4, below).
2. Thread the spring adjuster (key 12) out of the yoke (key 9) until all spring compression is relieved.
3. If required, remove the actuator from the valve body by separating the stem connector (key 26) and removing the
yoke locknut or, for the size 87 actuator, the stud bolt nuts. Separate the stem connector by loosening the stem
nuts (keys 15 and 16) and unscrewing the two cap screws.
4. Remove the diaphragm casing cap screws and nuts (keys 22 and 23), then lift off the upper diaphragm casing
(key 1).
5. Remove the actuator diaphragm (key 2).
6. Remove the diaphragm plate, actuator stem, and cap screw (keys 4, 10 and 3) as an assembly. This assembly can be
broken down further, if required, by removing the cap screw (key 3).
7. Remove the actuator spring (key 6) and the spring seat (key 11).
8. If required, remove the lower diaphragm casing (key 5) from the yoke (key 9) by loosening the cap screws (key 8)
that hold it in place.
9. If required, remove the spring adjuster (key 12) by unscrewing it from the yoke (key 9).
Table 2. Actuator Assembly Recommended Torque Values
DESCRIPTION, KEY NUMBER
ACTUATOR SIZE
THREAD SIZE, INCH
TORQUE
N•m
Lbf•ft
Diaphragm plate to stem, key 3
30/30i
3/8-24
41
30
34/34i and 40/40i
1/2-20
54
40
45/45i to 70/70i and 87
3/4-16
149
110
MO U-bolt, key 170
34 and 40
1/2-13
81
60
45 to 60
5/8-11
163
120
MO U-bolt, key 147
34 and 40
3/8-16
41
30
MO U-bolt, key 144
45 to 60
3/8-16
41
30
Diaphragm casing, key 23
(1)
30/30i to 70/70i and 87
3/8-24
27
20
Hex cap screw,key 256
34i to 40i
1/2-13
92
68
45i to 60i
5/8-11
163
120
Hex cap screw,key 257
34i to 60i
3/8-16
39
29
Casing to yoke, key 8
30/30i to 60/60i
3/8-16
39
29
70/70i and 87
1/2-13
92
68
Top-mounted handwheel and
travel stop mounting, key 141
30/30i to 60/60i
3/8-16
39
29
Stem connector, key 26
(2)
30/30i through 40/40i
5/16-18
23
17
45/45i through 70/70i
3/8-16
39
29
87
1/2-13
91
67
1. Observe tightening pattern and procedure described in the appropriate Actuator Assembly section.
2. Torque values when lithium grease is used on the threads.
Actuator Assembly
Refer to table 2 as appropriate.
1. Coat the threads and the spring seat bearing surface of the spring adjuster (key 12) with lithium grease (key 241),
and thread the spring adjuster into the yoke (key 9). Place the spring seat (key 11) in the yoke on the spring adjuster
and turn the spring adjuster to ensure that threads are properly engaged.
