Fisher 667 User manual

www.Fisher.com
Fisherr667 Diaphragm Actuator
Sizes 30-76 and 87
Contents
Introduction 1....................................
Scope of Manual 1.............................
Description 2.................................
Specifications 3...............................
Maximum Pressure Limitations 3.................
Installation 4
.....................................
Mounting the Actuator on the Valve 5............
Discussion of Bench Set 7.......................
Spring Verification 8...........................
Installing the Stem Connector Assembly 9.........
Deadband Measurement 11.....................
Loading Connection 11.........................
Maintenance 12
.................................
Actuator 12..................................
Top-Mounted Handwheel Assembly
(Adjustable Down Travel Stop) 15..............
Side-Mounted Handwheel Assembly for
Size34through60Actuators 18...............
Side-Mounted Handwheel Assembly for
Size 70, 76, and 87 Actuators 19...............
Casing-Mounted Travel Stops 21.................
Parts Kits 23
.....................................
Side-Mounted Handwheels Retrofit Kits 23........
Top-Mounted Handwheel Retrofit Kits 23.........
Actuator Repair Kits 23.........................
Parts List 24
.....................................
Actuator Assembly 24..........................
Top-Mounted Handwheel 28...................
Figure 1. Fisher 667 or 667-4 Actuator Mounted on
easy-e™ Valve
W1916-1*
Side-Mounted Handwheel (34-60) 33............
Side-Mounted Handwheel (70, 76, and 87) 33....
Casing Mounted Travel Stops 35.................
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 667 actuator in sizes 30 through 76 and size 87. The 667-4 actuator in sizes 70 and 87 is also covered. Refer to
separate instruction manuals for information about the valve positioner and other accessories used with these
actuators.
Do not install, operate, or maintain a 667 actuator (see figure 1) without being fully trained and qualified in valve,
actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is
important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and
Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
2
warnings. If you have any questions about these instructions, contact your Emerson Process Management sales office
before proceeding.
Table 1. Specifications
SPECIFICATION(1) ACTUATOR SIZE
30 34 40 45 46 50 60 70(1) 76 87(1)
Nominal Effective Area Sq cm 297 445 445 667 1006 677 1006 1419 1006 1419
Sq Inch 46 69 69 105 156 105 156 220 156 220
Yoke Boss Diameter mm 54 54 71 71 71 90 90 90 90 125
Inch 2-1/8 2-1/8 2-13/16 2-13/16 2-13/16 3-9/16 3-9/16 3-9/16 3-9/16 5
Acceptable Valve Stem Diameter mm 9.5 9.5 12.7 12.7 12.7 19.1 19.1 19.1 19.1 25.4
Inch 3/8 3/8 1/2 1/2 1/2 3/4 3/4 3/4 3/4 1
Maximum Allowable Output Thrust(4) N10230 10230 12010 25131 33582 25131 30246 39142 30246 39142
LB 2300 2300 2700 5650 7550 5650 6800 8800 6800 8800
Maximum Travel(2) mm 19 29 38 51 51 51 51 76(3) 51 76(3)
Inch 0.75 1.125 1.5 2 2 2 2 3(3) 2 3(3)
Maximum Casing Pressure for Actuator
Sizing(4,6)
Bar 3.8 4.8 4.8 4.5 3.8 4.5 3.8 3.4 3.4 3.4
Psig 55 70 70 65 55 65 55 50 50 50
Maximum Excess Diaphragm
Pressure(4,5)
Bar 3.8 1.4 1.4 0.7 0.7 0.7 0.7 0.7 0.7 0.7
Psig 55 20 20 10 10 10 10 10 10 10
Maximum Diaphragm Casing
Pressure(4,6,7)
Bar 7.6 6.2 6.2 5.2 4.5 5.2 4.5 4.1 4.1 4.1
Psig 110 90 90 75 65 75 65 60 60 60
Approximate Weight Kg 15 22 23 41 55 43 55 115 86 118
Pounds 34 48 50 90 121 94 122 254 190 260
Material
Temperature
Capabilities
Nitrile Elastomers -40 to 82_C (-40 to 180_F)
Silicone Elastomers -54 to 149_C (-65 to 300_F)
1. These values also apply to the 667-4 actuator construction.
2. Actuator travel may be less than the value listed after connected to the valve.
3. Maximum actuator travel for 667-4 is 102 mm (4 inches).
4. See also the Specifications portion of the introduction section.
5. Additional pressure may be added when the actuator is at full travel. If the Maximum Excess Diaphragm Pressure is exceeded, damage to the diaphragm or diaphragm casing might result.
See the Maximum Pressure Limitation section.
6. Maximum diaphragm casing pressure must not be exceeded and must not produce a force on the actuator stem greater than the maximum allowable actuator output thrust or the maxi
mumallowablestemload.SeetheMaximumPressureLimitationsection.
7. This maximum casing pressure is not to be used for normal operating pressure. Its purpose is to allow for typical regulator supply settings and/or relief valve tolerances.
Description
The 667 actuator (figure 1) and the 667-4 actuator are reverse-acting, spring-opposed diaphragm actuators. They
provide automatic operation of control valves. The 667 actuator provides 76 mm (3 inches) maximum actuator travel.
The 667-4 actuator provides 102 mm (4 inches) maximum actuator travel. Both actuators position the valve plug in
response to varying pneumatic loading pressure on the diaphragm. Figure 2 shows the operation of these actuators.
A 667 or 667-4 actuator can be furnished with either a top-mounted or a side-mounted handwheel assembly. A
top-mounted handwheel assembly is normally used as an adjustable down travel stop. (A down travel stop limits
actuator travel in the down direction [when the stem is traveling out of the actuator]. Travel in the up direction is when
the stem is traveling into the actuator.) A side-mounted handwheel assembly is normally used as an auxiliary manual
actuator. The side-mounted handwheel can also be used as an adjustable up or down travel stop. Casing-Mounted
adjustable up or down travel stops are also available on this actuator.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
3
Figure 2. Schematic of Fisher 667 and 667-4 Actuators
STEM
SEAL
STEM
AIR LIFTS
STEM UP
SPRING PUSHES
STEM DOWN
A6759
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side-mounted handwheel rather than a
casing-mounted travel stop or top-mounted handwheel. The side-mounted handwheel is designed for more frequent use as a
manual operator.
Specifications
Refer to table 1 for Specifications of the 667 and 667-4 actuators. See the actuator nameplate for specific information
foryouractuator.
WARNING
To avoid personal injury or damage to equipment that may result in the malfunction of the control valve or loss of control
of the process caused by excessive pressure, do not exceed the Maximum Pressures listed in table 1. Refer to the Maximum
Pressure Limitations section.
Maximum Pressure Limitations
The casing and diaphragm of 667 actuators are pressure operated. This air pressure provides energy to compress the
spring, to stroke the actuator, and to seat the valve. The following explanations describe the maximum pressure limits
for an actuator. Refer to the nameplate or table 1 for maximum values for your actuator.
DMaximum Casing Pressure for Actuator Sizing: This is the maximum pressure that can be applied at less than full
travel of the actuator. If this stroking pressure is exceeded before the upper diaphragm plate contacts the travel
stop, damage to the stem or other parts might result.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
4
DMaximum Excess Diaphragm Pressure: Additional pressure may be added when the actuator is at full travel. If the
Maximum Excess Diaphragm Pressure is exceeded, damage to the diaphragm or diaphragm casing might result.
Because the actuator has traveled its specified travel, and the diaphragm head is physically stopped from movement,
the energy from any additional air pressure is transmitted to the diaphragm and diaphragm casings. The amount of air
pressure that can be added once the actuator has traveled to the stops is limited by the resultant adverse effects that
may occur. Exceeding this limiting factor could result in leakage or casing fatigue due to the deformation of the upper
diaphragm casing.
DMaximum Diaphragm Casing Pressure: If the Maximum Diaphragm Casing Pressure is exceeded, damage to the
diaphragm, diaphragm casing, or actuator might result.
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations.
Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
Key number locations are shown in figures 6, 7, and 8, unless otherwise noted. Also, refer to figure 3 for location of
parts.
CAUTION
To avoid parts damage, do not use an operating pressure that exceeds the Maximum Diaphragm Casing Pressure (table 1)
or produces a force on the actuator stem greater than the Maximum Allowable Output Thrust (table 1) or the Maximum
Allowable Valve Stem Load.
DValve/Actuator Assembly: If the actuator and valve are shipped together as a control valve assembly, it has been
adjusted at the factory, and may be installed in the pipeline. After installing the valve in the pipeline, refer to the
Loading Connection procedures.
DActuator Mounting: If the actuator is shipped separately or the actuator has been removed from the valve, it is
necessary to mount the actuator on the valve before placing the valve in the pipeline. Refer to the following
actuator mounting procedures before placing the valve in service. It is recommended that you perform the Bench
Set Spring Adjustment procedures in this section to confirm that the actuator is adjusted correctly for the valve
travel.
DPositioner: If a positioner is installed, or is to be installed on the actuator, refer to the positioner instruction manual
for installation. During the adjustment procedures, it will be necessary to provide a temporary loading pressure to
the actuator diaphragm.
DHandwheel Cap: If the handwheel cap (key 247, figures 9, 11, or 16) is not in place, install the cap by pushing it on
by hand until it snaps into place.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
5
Figure 3. Actuator-Mounting Components for Size 30 through 70 Actuators
VALVE STEM
YOKE LOCK NUT
YOKE BOSS DIAMETER
BONNET
TYPICAL VALVE
(REFER TO
VALVE MANUAL)
W6199-1
MATCH LINE
FOR
ACTUATOR
VENT ASSEMBLY
DIAPHRAGM CASINGS
DIAPHRAGM AND STEM
SHOWN IN DOWN POSITION
DIAPHRAGM
PLATE
LOADING AIR
PRESSURE CONNECTION
ACTUATOR SPRING
ACTUATOR STEM
SPRING SEAT
SPRING ADJUSTOR
STEM CONNECTOR
YOKE
TRAVEL INDICATOR DISK
INDICATOR SCALE
W0364-1
Mounting the Actuator on the Valve
CAUTION
The 667 actuator spring load pushes the stem down out of the actuator yoke (see figure 2), and it can come in contact with
the valve stem during actuator mounting.
If the valve stem is allowed to remain in the up position (towards the actuator) during actuator mounting, it can interfere
with the actuator stem during mounting. It is possible to damage valve stem threads or bend the valve stem. Be sure the
valve stem is pushed down (into the valve body), away from the actuator while mounting.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
6
Figure 4. Bench Set Adjustment
SPRING
ADJUSTER
ACTUATOR STEM
UPPER BENCH
SET LOADING
PRESSURE
LOWER BENCH
SET PRESSURE
MARK
VALVE STEM
RATED VALVE
TRAVEL MEASURE
MARK VALVE
STEM HERE LOWER BENCH SET
LOADING PRESSURE
3
1
NOTES:
THE LOWER PSIG LOADING PRESSURE
(MARKED ON NAMEPLATE) WHERE THE FIRST MOVE
MENT OF ACTUATOR STEM IS DETECTED.
MARK THIS POINT WITH TAPE OR A
MARKER.
THE UPPER PSIG LOADING PRESSURE
RETRACTS ACTUATOR STEM.
MEASUREDISTANCEOFTRAVEL.IT
SHOULD EQUAL THE TRAVEL SPAN SHOWN ON THE
TRAVEL INDICATOR SCALE.
1
2
3
4
2
4
4
50A8379-C
B2429-1
It may be necessary to apply a temporary loading pressure to the actuator to move the actuator stem away from the
valve during installation.
If it is not possible to provide a temporary loading pressure, be very careful when lowering the actuator over the valve
stem to prevent damage to valve stem and threads.
WARNING
When moving the actuator stem with loading pressure applied, exercise caution to keep hands and tools out of the
actuator stem travel path. If the loading pressure is accidently disconnected, personal injury and property damage may
result if something is caught between the actuator stem and other control valve parts.
1. Provide a vise or some other method of supporting the valve and the weight of the actuator during assembly. For
direct or reverse acting valves, push the valve stem down away from the actuator while mounting the actuator.
2. Screw the stem locknuts all the way onto the valve stem. With the concave side of the travel indicator disk (key 34)
facing the valve, install the travel indicator disk on the valve stem. (Note: The travel indicator disk is not used with
size 87 actuators.)
3. Lift or hoist the actuator onto the valve bonnet:
a. For size 87 actuators: Slowly lower the actuator down onto the valve while guiding the valve stem into the
opening in the end of the actuator stem (see figure 4). Once the actuator is in place, insert the cap screws and
tighten the hex nuts, securing the actuator to the bonnet.
b. Forallothersizeactuators:
DSlowly lower the actuator down onto the valve. As the yoke passes over the end of the valve stem, place the yoke
locknut over the valve stem. (Note: On small size actuators, it may be necessary to remove the indicator disk and
re-install it while lowering the actuator onto the valve because the disk will not go through the actuator yoke
opening).

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
7
DContinue to lower the actuator while guiding the valve stem into the opening in the end of the actuator stem until
the actuator is in place (see figure 4).
DScrew the yoke locknut onto the valve bonnet and tighten the locknut.
4. Do not connect the actuator stem to the valve stem at this time. Whenever the actuator is installed on the valve, it
is recommended that you perform the Bench Set Spring Adjustment procedures below, to verify that the actuator is
still adjusted correctly.
Discussion of Bench Set
The bench set pressure range is used to adjust the initial compression of the actuator spring with the valve-actuator
assembly “on the bench.” The correct initial compression ensures that the valve-actuator assembly will function
properly when it is put into service and the proper actuator diaphragm operating pressure is applied.
The bench set range is established with the assumption that there is no packing friction. When attempting to adjust
the spring in the field, it is very difficult to ensure that there is no friction being applied by “loose” packing.
Accurate adjustment to the bench set range can be made during the actuator mounting process by making the
adjustment before the actuator is connected to the valve (see the Bench Set Spring Adjustment Procedure).
If you are attempting to adjust the bench set range after the actuator is connected to the valve and the packing
tightened, you must take friction into account. Make the spring adjustment so full actuator travel occurs at the bench
set range (a) plus the friction force divided by the effective diaphragm area with increasing diaphragm pressure or (b)
minus the friction force divided by the effective diaphragm area with decreasing diaphragm pressure.
For an assembled valve-actuator assembly, the valve friction may be determined by following the procedure described
below:
1. Install a pressure gauge in the actuator loading pressure line that connects to the actuator diaphragm casing.
Note
Steps 2 and 4 require that you read and record the pressure shown on the pressure gauge.
2. Increase the actuator diaphragm pressure and read the diaphragm pressure as the actuator reaches its mid-travel
position.
3. Increase the actuator diaphragm pressure until the actuator is at a travel position greater than its mid-travel
position.
4. Decrease the actuator diaphragm pressure and read the diaphragm pressure as the actuator reaches its mid-travel
position.
The difference between the two diaphragm pressure readings is the change in the diaphragm pressure required to
overcome the friction forces in the two directions of travel.
5. Calculate the actual friction force:
Friction
Force, = 0.5
pounds
Difference
in pressure
readings, psig
¢
Effective
diaphragm area,
inches2


Refer to table 1 for the effective diaphragm area.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
8
When determining valve friction, you can make diaphragm pressure readings at a travel position other than mid-travel
if you desire. If you take readings at zero or at the full travel position, take extra care to ensure that the readings are
taken when the travel just begins or just stops at the position selected.
It is difficult to rotate the spring adjustor (key 74, figure 6, 7, and 8) when the full actuator loading pressure is applied
to the actuator. Release the actuator loading pressure before adjusting. Then re-apply loading pressure to check the
adjustment.
Spring Verification
Ensure that the actuator diaphragm is at the bottom of its travel as shown in figure 4 and not connected to the valve.
(Note: Some spring compression is required to move the diaphragm to the bottom of its travel.)
Also, provide a certified pressure gauge that will accurately read the diaphragm pressure from 0 through the upper
bench set pressure marked on the nameplate. Apply loading pressure to the diaphragm.
Stroke the actuator a few times to ensure that the pressure gauge is working correctly, and that the actuator is
functioning properly.
CAUTION
To prevent product damage, it is important to ensure that the actuator assembly is not binding or producing any friction on
the actuator stem movement.
Key numbers are shown in figures 6, 7, and 8.
For Direct-Acting Valves (PDTC [Push Down to Close])
1. If not already accomplished, push the valve stem down away from the actuator to the closed position.
2. Set the diaphragm loading pressure to 0.3 bar (5 psig) over the upper bench set pressure. The upper travel stop
should be contacting the diaphragm casing.
3. Slowly decrease the pressure towards the upper bench set pressure while checking for the first movement of the
actuator stem.
Note
Before turning the spring adjuster on size 70, 76, or 87 actuators, assemble the stem connector around the actuator stem and the
anti-rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur. Remove the
stem connector before rechecking the bench set.
4. If movement occurs before or after the upper pressure is reached, adjust the spring adjuster (see figure 4). Thread
the adjuster up or down on the actuator stem until the actuator stem movement is first detected at the upper
bench set pressure. (Note: You may need to lower the loading pressure to reduce spring compression, allowing the
spring adjuster to turn.)
5. Be sure the spring adjuster is adjusted to meet the requirements of step 4 above.
6. Apply the lower bench set loading pressure to the diaphragm. This will extend the actuator stem toward the valve.
Mark the end of the actuator stem on a nearby surface using tape or some other method.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
9
7. Slowly increase the diaphragm pressure until the upper bench set loading pressure is applied. Again, the travel stop
should be against the diaphragm casing.
8. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the
travel span shown on the travel indicator scale (key 32).
9. If the span of travel is correct, bench set is complete. Proceed to the Installing the Stem Connector Assembly
subsection.
10. If the travel span is not exact, remember the free-length and load rate tolerances for the spring may produce a
slightly different span than specified. Contact your Emerson Process Management sales office for assistance.
For Reverse-Acting Valves (PDTO [Push Down to Open])
1. If not already accomplished, push the valve stem down away from the actuator to the open position. Later, when
installing the connector, pull up the valve stem to the closed position.
2. Set the diaphragm loading pressure to a value less than the lower bench set pressure (near zero). The down travel
stop should be contacting the yoke.
3. Slowly increase the pressure towards the lower bench set pressure while checking for the first movement of the
actuator stem.
Note
Before turning the spring adjuster on size 70, 76, or 87 actuators, assemble the stem connector around the actuator stem and the
anti-rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur. Remove the
stem connector before rechecking the bench set.
4. If movement occurs before or after the lower pressure is reached, adjust the spring adjuster (see figure 4). Thread
the adjuster up or down on the actuator stem until the actuator stem movement is first detected at the lower bench
set pressure.
5. Apply the upper bench set loading pressure to the diaphragm. This will retract the actuator stem away from the
valve. Mark the end of the actuator stem on a nearby surface using tape or some other method.
6. Slowly decrease the diaphragm pressure until the lower bench set loading pressure is applied. Again, the
down-stops should be against the yoke.
7. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the
travel span shown on the travel indicator scale (key 32).
8. If the span of travel is correct, bench set is complete. Proceed to the Installing the Stem Connector Assembly
subsection.
9. If the travel span is not exact, remember the free-length and load rate tolerances for the spring may produce a
slightly different span than specified. Contact your Emerson Process Management sales office for assistance.
Installing the Stem Connector Assembly
When installing the stem connector assembly (key 31), the actuator and valve stem threads should engage the
threads of the stem connector by a distance equal to the diameter of the stem.
Note
Replacement stem connectors are an assembly of two stem connector halves, cap screws, and a spacer between the connector
halves. Remove the spacer and discard it, if present, before clamping the actuator and valve stems together.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
10
1. If necessary, push the valve stem down so that the valve plug is touching the seat ring on direct-acting valves. For
reverse-acting valves, pull the stem up to the closed position. Always start with the valve plug on the seat.
2. If necessary, screw the valve stem locknuts down, away from the connector location. For all actuators except size
87, ensure that the travel indicator disk (key 34) is on top of the locknuts.
3. Adjust the diaphragm pressure to the lower bench set pressure (or, the upper bench set pressure for reverse-acting
valves.) This should be the same pressure used in the bench set steps, and it is marked on the nameplate.
4. Place the stem connector half with the threaded holes, approximately half way between the actuator and valve
stems. Refer to figures 6, 7, and 8 to help locate the connector position.
Be sure that the actuator and valve stem threads are engaging the threads of the stem connector by a distance equal
to one diameter of the stem.
CAUTION
Incomplete engagement of either the valve stem or actuator stem in the stem connector can result in stripped threads or
improper operation. Be sure that the length of each stem clamped in the stem connector is equal to or greater than one
diameter of that stem. Damage to threads on either stem or in the stem connector can cause the parts to be replaced
prematurely.
5. Install the other half of the stem connector and insert the cap screws and tighten them. If installing a positioner,
also attach the feedback bracket at the same time.
CAUTION
Over-tightening the valve stem locknuts can make disassembly difficult.
6. Screw the valve stem locknuts up until the indicator disk contacts the bottom of the stem connector, or for size 87
actuators, tighten the locknuts against the stem connector. Do not overtighten the locknuts.
7. Slowly increase and then decrease pressure several times, stroking the valve from the lower bench set pressure to
the upper pressure.
Be sure that the valve is in the closed position (up or down, depending on valve action). Loosen the screws on the
travel scale, and align it with the travel indicator disk. Stroke the valve full travel to ensure that the travel matches the
valve travel on the travel indicator plate. If valve travel is not correct, repeat the stem connector procedure.
Note
For push-down-to-close valves, the valve plug seat is the limit for downward travel and the actuator up-stop is the limit for upward
(away from the valve) movement. For push-down-to-open valves, the actuator down-stop is the limit for downward movement,
and the valve seat is the limit for upward (away from the valve) movement. For 667 actuators, a down-stop (key 77, figure 6) is
installed to limit actuator diaphragm downward movement when the actuator provides the limit.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
11
Figure 5. Typical Reverse-Acting Valve Response to Deadband
UPPER
BENCH SET
PRESSURE
LOWER
BENCH SET
PRESSURE
9
3
0
OPENING
VALVE
15 1.0
0.6
0.2
CLOSING
VALVE
CLOSED OPEN
MID RANGE
VALVE TRAVEL
DIAPHRAGM PRESSURE, PSIG
DIAPHRAGM PRESSURE, BAR
1
NOTE:
DEADBAND IS CAUSED BY FRICTION.
A6588-1
RANGE OF
DEADBAND 1
Deadband Measurement
Deadband is caused by packing friction, unbalanced forces, and other factors in the control valve assembly. Deadband
is the range a measured signal can vary without initiating a response from the actuator (see figure 5). Each actuator
spring has a fixed spring rate (force). You have verified that the right spring was installed in the actuator by completing
the Bench Set Spring Adjustment steps.
Deadband is one factor that affects the control valve assembly operation during automatic loop control. The control
loop tolerance for deadband varies widely depending on the loop response. Some common symptoms of the
deadband being too wide are no movement, a “jump” movement, or oscillating movements of the actuator during
automatic loop control. The following steps are provided to determine the span of deadband. The percent of
deadband is helpful in troubleshooting problems with the process control loop.
1. Start at a pressure near the lower bench set pressure, slowly increase pressure until the valve is approximately at
mid-travel. Note this pressure reading.
2. Slowly decrease pressure until movement of the valve stem is detected, and note this pressure.
3. The difference between these two pressures is deadband, in psi.
4. Calculate the percent of deadband by:
Deadband, psi
Deadband = Deadband, psi =nn%
Bench Set Span, psi
Loading Connection
Key number locations are shown in figures 6, 7, and 8, unless otherwise noted.
The loading pressure connections are made at the factory if the valve, actuator, and positioner come as a unit. Keep
the length of tubing or piping as short as possible to avoid transmission lag in the control signal. If a volume booster,
valve positioner, or other accessory is used, be sure that it is properly connected to the actuator. Refer to the
positioner instruction manual or other manuals as necessary. For actuators shipped separately or whenever the
actuator pressure connections are installed, use the following steps:

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
12
1. Connect the loading pressure piping to the NPT internal connection in the side of the yoke (key 73).
2. For size 70 and 87 actuators, if necessary, remove the 1/4 NPT bushing if a 1/2 NPT internal connection is needed to
increase connection size. The connection can be made with either piping or tubing.
3. Cycle the actuator several times to be sure that the valve stem travel is correct when the correct pressure ranges are
applied to the diaphragm.
4. If valve stem travel appears to be incorrect, refer to the Bench Set Spring Adjustment procedures at the beginning
of this section. Do not place the valve in service if it is not reacting correctly to diaphragm loading pressure changes.
Maintenance
Actuator parts are subject to normal wear and must be inspected regularly and replaced when necessary. The
frequency of inspection and replacement depends on the severity of service conditions.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or uncontrolled movement of parts.
Before performing any maintenance operations:
DDo not remove the actuator from the valve while the valve is still pressurized.
DAlways wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
DDisconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
DUse bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
DVent the power actuator loading pressure and relieve any actuator spring pre-compression.
DUselock-outprocedurestobesurethattheabovemeasures stay in effect while you work on the equipment.
DThe valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
DCheck with your process or safety engineer for any additional measures that must be taken to protect against process
media.
The maintenance instructions are divided into several sections: Actuator, Top-Mounted Handwheel Assembly
(Adjustable Down Travel Stop), Side-Mounted Handwheel Assembly for Size 34 through 60 Actuators (Manual
Actuator), Side-Mounted Handwheel Assembly for Size 70, 76 and 87 Actuators (Manual Actuator), and
Casing-Mounted Travel Stops.
Actuator
This procedure describes how the actuator can be completely disassembled and assembled. When inspection or
repairs are required, disassemble only those parts necessary to accomplish the job; then, start the assembly at the
appropriate step.
Key numbers are shown in figures 6, 7, or 8, unless otherwise noted. Figure 6 shows the size 30 through 60 actuators,
figure 7 shows the size 70 actuator, and figure 8 shows the size 87 actuator.
Actuator Disassembly
Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. Also shut off all pressure lines to the power actuator, release all pressure

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
13
fromtheactuator.Uselock-outprocedurestobesurethattheabovemeasuresstayineffectwhileyouworkonthe
equipment.
1. Remove the tubing or piping from the connection in the top of the yoke (key 73).
2. Turn the spring adjuster (key 74) counterclockwise (toward the valve body) until all spring compression is relieved.
WARNING
To avoid personal injury due to the sudden uncontrolled movement of parts, do not loosen the stem connector cap screws
when the stem connector has spring force applied to it.
3. If necessary, remove the actuator from the valve body by separating the stem connector (key 31). Loosen the stem
locknutsforthesize87actuator,andremovethestemconnector nuts. For all other sizes, separate the stem
connector by loosening the stem locknuts (keys 69 and 75) and unscrewing the two stem connector cap screws.
4. Unscrew the spring adjuster (key 74) from the actuator stem (key 144). Also lift the spring seat and spring (key 19
and 18) out of the yoke.
5. Remove the diaphragm casing cap screws and nuts (keys 13 and 14), and lift off the upper diaphragm casing (key
1).
CAUTION
Be careful during disassembly to avoid damaging the O-rings (key 8).
6. Remove the following connected parts: the diaphragm (key 3), upper diaphragm plate (key 4), spacer (key 2), cap
screw (key 12), lower diaphragm plate (key 71), and actuator stem (key 144). Be careful when pulling the threads of
the actuator stem through the seal bushing (key 7) to avoid damaging the O-rings (key 8).
7. Remove the cap screw (key 12) to separate the parts of this assembly.
8. To remove the seal bushing, remove the snap ring (key 72), and lift out the bushing. Inspect, and if necessary,
replace O-rings (keys 8 and 9).
9. Remove cap screws (key 30), and take off the lower diaphragm casing (key 64) and the gasket (key 70, size 30
through 60 and 76) or O-ring (key 70, size 70 or 87). If necessary, the down travel stops (key 77) can be removed.
Actuator Assembly
1. Coat the O-rings (key 70, sizes 70 and 87) with lithium grease (key 237), or, coat the gasket with lithium grease (key
237). Place a new gasket or O-ring (key 70) on the yoke (key 73). Position the lower diaphragm casing (key 64) on
the yoke and align the holes. Insert the cap screws (key 30) and tighten evenly in a crisscross pattern to 41 NSm(30
lbfSft) for size 30-60 and 76 actuators or 95 NSm(70lbfSft) for size 70 and 87 actuators. If down travel stops (key 77)
were removed, insert and tighten them.
2. Coat the O-rings (keys 8 and 9) with lithium grease (key 237) and place the O-rings in the seal bushing (key 7).
3. Fill the seal bushing with lithium grease (key 237), slide the bushing into the yoke (key 73), and install the snap ring
(key 72).
CAUTION
Be careful during assembly to avoid damaging the O-rings (key 8).

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
14
4. Assemble the actuator stem (key 144), lower diaphragm plate (key 71), diaphragm (key 3), upper diaphragm plate
(key 4), and the travel stop cap screw and spacer (keys 12 and 2). Coat the cap screw threads with lithium grease
(key 237). Tighten the cap screw (key 12) to the appropriate torque as shown in table 2. Place this assembly in the
actuator. Take care when pushing the actuator stem through the seal bushing so that the threads do not damage
the O-rings.
Table 2. Travel Stop Cap Screw (Key 12) Torque
ACTUATOR SIZE TORQUE
NSmLbfSft
30 41 30
34 and 40 68 50
45 to 76 and 87 183 135
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following tightening sequence with a manual torque wrench for
size 30-76 and 87 actuators.
CAUTION
Over-tightening the diaphragm cap screws and nuts (keys 13 and 14) can damage the diaphragm. Do not exceed 27 NSm
(20 lbfSft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
5. Install the upper diaphragm casing (key 1), and install the cap screws and nuts (keys 13 and 14). Tighten the
diaphragm cap screws and nuts in the following manner.
6. The first four bolts tightened should be diametrically opposed and 90 degrees apart. Tighten these four bolts to 13
NSm(10lbfSft).
7. Tighten the remaining bolts in a clockwise, criss-cross pattern to 13 NSm(10lbfSft).
8. Repeat this procedure by tightening four bolts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm
(20 lbfSft).
9. Tighten the remaining bolts in a clockwise, criss-cross pattern to 27 NSm(20lbfSft).
10. After the last bolt is tightened to 27 NSm(20lbfSft), all of the bolts should be tightened again to 27 NSm(20lbfSft)
in a circular pattern around the bolt circle.
11. Once completed, no more tightening is recommended.
12. Install the actuator spring (key 18) and spring seat (key 19). Apply anti-seize lubricant (key 239) to the threads of
the actuator stem and to the surface of the spring adjuster (key 74) that contacts the spring seat. Thread the spring
adjuster onto the actuator stem.
13. Mount the actuator onto the valve in accordance with the procedures in the Installation section.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
15
Top-Mounted Handwheel Assembly (Adjustable Down Travel Stop)
Actuator key numbers are shown in figures 6, 7, and 8. And, top-mounted handwheels are shown in figures 9, 11, and
12.
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side-mounted handwheel rather than a
casing-mounted travel stop or top-mounted handwheel. The side-mounted handwheel is designed for more frequent use as a
manual operator.
A top-mounted handwheel assembly (figures 9, 11, and 12) is usually used as an adjustable down travel stop to limit
full extension of the actuator stem. Turning the handwheel counterclockwise pulls the extension rod (key 150, figures
9, 11, and 12) up, retracting the actuator stem.
Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; then, begin the assembly at the appropriate step.
Disassembly for Top-Mounted Handwheel
1. Bypass the control valve, reduce loading pressure to atmospheric, and remove the tubing or piping from the
connection in the top of the yoke (key 73, figures 6, 7, and 8).
2. Turn the handwheel (key 58) clockwise so that the handwheel assembly is not causing any spring compression.
3. Turn the actuator spring adjuster (key 74) to relieve all the compression from the spring (key 18).
4. If servicing just the thrust bearing, races, and handwheel screw (keys 180, 181, and 160), use the following steps:
DRemove the cap and take out the cotter pin. Remove the castle nut, bearing retainer, thrust bearing, and races (keys
247, 167, 166, 180, and 181).
DUse the handwheel to remove the handwheel screw (key 160) from the handwheel body (key 148).
DIf necessary, remove the extension rod (key 150) at this time. Most maintenance procedures do not require the rod
to be removed.
DClean and inspect all parts or replace parts as necessary. Upon re-assembly, lubricate handwheel threads, bearings,
and races with anti-seize lubricant (key 239).
DLubricate and re-install the handwheel screw into handwheel body (key 148). Lubricate and replace the races,
bearing, and retainer (keys 181, 180, and 182). Replace the castle nut (key 166), tighten it, and insert the cotter pin
(key 167). Replace the handwheel cap (key 247).
5. Forsize30through60and76actuatorhandwheels(figures9and11):
DRemove the cap screws (key 161). Make sure that the guide plate can turn between the handwheel body and the
mounting plate (keys 157, 148 and 158).
DRemove the cap (key 247) and cotter pin (key 167). Remove the castle nut (key 166) and, if necessary, unscrew the
extension rod (key 150). Remove the rod, the handwheel body (key 148), and the attached parts.
DRemove the hex nuts and cap screws (keys 14 and 13, figures 6, 7, and 8) from the diaphragm casings. Lift off the
upper diaphragm casing (key 1) and the mounting plate (key 158).

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
16
DTurn the handwheel (key 58) to remove the handwheel screw (key 160) from the handwheel body (key 148).
Remove the retaining ring (key 60) if the handwheel (key 58) must be separated from the handwheel screw.
DIf necessary, perform other actuator maintenance before returning to the following assembly steps.
6. For size 70 and 87 actuator handwheels (figure 12):
DRemove the cap (key 247). Take out the cotter pin (key 167) and remove the castle nut, the bearing retainer, and
thrust bearing (keys 166, 182, 181, and 180). It is not necessary to remove the extension rod (key 150) at this time.
DRemove the hex nuts and cap screws (keys 14 and 13, figures 6, 7, and 8) from the diaphragm casings. Lift off the
upper diaphragm casing (key 1), handwheel body (key 148) and attached parts.
DIf travel stops (key 152) are used, note and record their position relative to the cap screws (key 154) for use in
assembly. Remove the travel stops and cap screws, and remove either the mounting plate (key 158, figure 12) or
the handwheel body (key 148, figure 12) and attached parts.
DTurn the handwheel (key 58) to remove the handwheel screw (key 160) from the handwheel body (key 148).
Remove the retaining ring (key 60) if the handwheel (key 58) must be separated from the handwheel screw.
DIf necessary, perform other actuator maintenance before returning to the following assembly steps.
Assembly for Top-Mounted Handwheel
For size 30 through 60 and 76 actuator handwheels:
Refer to figures 9 and 11 for top-mounted handwheel assemblies.
1. If it was removed, slide the handwheel (key 58) onto the end of the handwheel screw (key 160), and snap the
retaining ring (key 60) into place. Also, install the guide post (key 150) if it was removed.
2. Generously coat the threads of the handwheel screw (key 160) with anti-seize lubricant (key 239). Turn the screw
into the handwheel body (key 148).
3. Install the mounting plate (key 158) to the diaphragm casing (key 1, figures 6, 7, and 8) with the cap screws (key
154). Finger tighten the screws.
4. If travel stops were used, install the travel stops to their original positions as recorded in the proceeding
Disassembly steps. Tighten the screws and travel stops.
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following tightening sequence with a manual torque wrench for
size 30-76 and 87 actuators.
CAUTION
Over-tightening the diaphragm cap screws and nuts (keys 13 and 14) can damage the diaphragm. Do not exceed 27 NSm
(20 lbfSft) torque.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
17
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
5. Position the diaphragm casing (key 1, figures 6, 7, and 8), mounting plate (key 158), travel stops (key 152), if used,
and cap screws (key 154) on the diaphragm. Install the cap screws and hex nuts (keys 13 and 14, figures 6, 7, and 8)
and tighten in the following manner.
6. The first four bolts tightened should be diametrically opposed and 90 degrees apart. Tighten these four bolts to 13
NSm(10lbfSft).
7. Tighten the remaining bolts in a clockwise, criss-cross pattern to 13 NSm(10lbfSft).
8. Repeat this procedure by tightening four bolts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm
(20 lbfSft).
9. Tighten the remaining bolts in a clockwise, criss-cross pattern to 27 NSm(20lbfSft).
10. After the last bolt is tightened to 27 NSm(20lbfSft), all of the bolts should be tightened again to 27 NSm(20lbfSft)
in a circular pattern around the bolt circle.
11. Once completed, no more tightening is recommended.
12. If necessary, screw the extension rod (key 150 into the connector (key 27). Slide the guide plate (key 157) onto the
extension rod (key 150). For size 45 through 76, place the spacer (key 253) on top of the guide plate (key 157). If
necessary, replace the extension rod (key 150). Slide the handwheel body (key 148) over the extension rod, position
the handwheel body on the spacer (key 253), align the holes, and insert and tighten the cap screws (key 161).
13. Lubricate and install the thrust bearings (keys 181 and 180), install the bearing retainer (key 182), install the castle
nut (key 166) on the extension rod. Do not overtighten the castle nut on the bearing. Install the cotter pin (key
167). Replace the cap (key 247).
14. Refer to the Assembly portion of the Actuator maintenance section.
For size 70 and 87 actuators handwheels (figure 12):
Refer to figure 12 for top-mounted handwheel assemblies.
1. If removed, slide the handwheel (key 58) onto the end of the handwheel screw (key 160), and snap the retaining
ring (key 60) into place.
2. Generously coat the threads of the handwheel screw (key 160) with anti-seize lubricant (key 239). Turn the screw
into the handwheel body (key 148).
3. If necessary, install the extension rod (key 150) into the connector (key 27) and tighten it. Position the handwheel
body (key 148) on the diaphragm casing (key 1, figures 6, 7, and 8), and align the holes. Insert the cap screws (key
154). Finger tighten the screws.
4. If travel stops were used, return the travel stops to their original positions as recorded in the proceeding
Disassembly steps. Tighten the screws and travel stops.
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following tightening sequence with a manual torque wrench for
size 30-76 and 87 actuators.

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
18
CAUTION
Over-tightening the diaphragm cap screws and nuts (keys 13 and 14) can damage the diaphragm. Do not exceed 27 NSm
(20 lbfSft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
5. Slide the extension rod (key 150) into the handwheel screw (key 160), and position the diaphragm casing (key 1,
figures 6, 7, and 8) with the attached parts on the diaphragm. Install the cap screws and hex nuts (keys 13 and 14,
figures 6, 7, and 8) and tighten in the following manner.
6. The first four bolts tightened should be diametrically opposed and 90 degrees apart. Tighten these four bolts to 13
NSm(10lbfSft).
7. Tighten the remaining bolts in a clockwise, criss-cross pattern to 13 NSm(10lbfSft).
8. Repeat this procedure by tightening four bolts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm
(20 lbfSft).
9. Tighten the remaining bolts in a clockwise, criss-cross pattern to 27 NSm(20lbfSft).
10. After the last bolt is tightened to 27 NSm(20lbfSft), all of the bolts should be tightened again to 27 NSm(20lbfSft)
in a circular pattern around the bolt circle.
11. Once completed, no more tightening is recommended.
12. Lubricate and install the thrust bearings (keys 180 and 181), install the bearing retainer (key 182), install the castle
nut (keys 166) on the extension rod. Do not overtighten the castle nut on the bearing. Install the cotter pin (key
167). Replace the cap (key 247).
13. Refer to the Assembly portion of the Actuator maintenance section.
Side-Mounted Handwheel Assembly for Size 34 through 60 Actuators
A side-mounted handwheel assembly (figures 13 and 14) is usually used as a manual actuator. This design is frequently
used to drive the valve open or closed under loading conditions. Turning the handwheel clockwise past the neutral
position always closes a push-down-to-close valve. A pair of levers (key 146, figure 13) on a handwheel assembly close
the valve by moving the valve stem.
Instructions are given below for disassembly and assembly. Perform the disassembly only as far as necessary to
accomplish the required maintenance; then begin the assembly at the appropriate step.
Disassembly for Side-Mounted Handwheel (34-60)
1. If desired, the handwheel assembly can be removed from the actuator yoke. To do this, remove the nuts (keys 147
and 170) from the U-bolts (keys 166 and 143) that hold the assembly to the yoke.
2. Remove the retaining ring (key 154), and drive out the lever pivot pin (key 153).
3. Two screws (key 156) hold the right- and left-hand levers (key 146) together. Remove the screw from the top of the
levers so that the levers will drop down out of the assembly. Disassemble further, if necessary, by removing the
other screw.
4. Remove the screw (key 161) and pointer mounting bolt (key 159, not shown) located behind the pointer (key 160).
5. Remove the nut (key 54), lockwasher (key 150), and washer (key 149), and take off the handwheel (key 51). Be
careful not to lose the small ball (key 55) and spring (key 56).

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
19
6. Unscrew the bearing retainer (key 136) after loosening the locking set screw (key 168, not shown).
7. Pull the screw assembly (key 145) out of the handwheel body. The operating nut (key 132) will come out with the
screw. Also, remove the bushing (key 151) on sizes 34 and 40.
8. If required, remove the bearings (key 152), one from the bearing retainer and the other from the handwheel body.
Assembly for Side-Mounted Handwheel (Sizes 34-60)
1. Pack the bearings (key 152) with anti-seize lubricant (key 239). Insert one bearing and the bushing (key 151) in the
handwheel body (key 142) as shown in figure 13 or 14. The bushing is not used in a handwheel assembly for size 45
through 60 actuators.
2. Coat the screw threads with anti-seize lubricant (key 239), and thread the operating nut onto the screw. Slide the
second bearing (key 152) onto the screw, and insert the end of the screw into either the bushing (key 151) as shown
in figure 13 or 14 or into the bearing.
3. Thread the bearing retainer (key 136) into the body (key 142). Completely tighten the bearing retainer, and then
loosen it one-quarter turn. Tighten the set screw (key 168, not shown) to hold the bearing retainer in place.
4. Coat the groove in the handwheel body (key 142) with lithium grease (key 237). Insert the spring (key 56) and ball
(key 55) into the handwheel (key 51). Holding the ball and spring in the handwheel, put the handwheel (key 51), the
washer (key 149), the lockwasher (key 150), and the hex nut (key 54) on the end of the screw (key 145). Tighten the
hex nut.
5. Position the pointer mounting bolt (key 159, not shown) and the pointer (key 160) as shown in figure 13 or 14.
Insert and tighten the screw (key 161).
6. Assemble the two levers (key 146) with the cap screws (key 156) for handwheel assemblies for size 45, 50, and 60
actuators or with the machine bolts (key 156) for handwheel assemblies on size 34 and 40 actuators.
7. If the handwheel assembly was removed from the yoke, remount the handjack assembly to the yoke using the
dowel pins for alignment. Position the U-bolts (keys 166 and 143) on the yoke, and hand-tighten the hex nuts (keys
170 and 147) to hold the handwheel assembly in position. Cap screws (key 163) should be tight against the yoke
legs to provide stability. Tighten nuts (key 144). Finish tightening the U-bolt nuts to 163 NSm [120 lbfSft] (key 170)
and 41 NSm[30lbfSft] (key 147). Be sure the handwheel assembly remains flat against the mounting pad and
perpendicular to the yoke.
8. Position the levers (key 146) as shown in figure 13 or 14. Insert the lever pivot pin (key 153), and snap the retaining
ring (key 154) onto the lever pivot pin.
Side-Mounted Handwheel Assembly for Size 70, 76, and 87 Actuators
A side-mounted handwheel assembly (figure 15) is usually used as a manual actuator. Turning the handwheel
clockwise past the neutral position always closes the valve body. A sleeve (key 123, figure 15) on a handwheel
assembly for a size 70, 76 or 87 actuator opens the valve body by moving the valve stem.
Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; and then begin the assembly at the appropriate step.
Disassembly for Side-Mounted Handwheel (Sizes 70, 76, and 87)
1. Bypass the control valve. Reduce the loading pressure to atmospheric. Disconnect the loading pressure tubing or
piping at the yoke.
2. Remove the cover band (key 87), and relieve spring compression by turning the spring adjuster (key 74)
counterclockwise.
3. Remove the cap screws and nuts (keys 13 and 14) and lift off the upper diaphragm casing (key 1).
4. Remove the travel stop screw (key 12) and spacer (key 2), and take off the diaphragm plate (key 4), the diaphragm
(key 3), and the lower diaphragm plate (key 71).

Instruction Manual
D100310X012
667 Size 30-76 and 87 Actuators
June 2011
20
5. Unscrew the cap screws (key 90) and remove the following connected parts: the lower diaphragm casing (key 64),
the O-ring (key 70), spring case adaptor (key 89), the seal bushing, O-rings, and snap ring (keys 7, 8, 9, and 72).
6. Remove the snap ring (key 72), and slide the seal bushing and O-rings (keys 7, 8, and 9) out of the spring case
adaptor (key 89).
7. Take out the actuator spring (key 18).
8. Remove the stem connector (key 31) and stem connector cap screws.
9. Pull the actuator stem (key 144) up and out of the yoke. The spring seat (key 19), spring adjuster (key 74), thrust
bearing (key 128), and the pinned adjusting screw (key 131) will come out with the actuator stem.
10. Turn the handwheel so that the lower sleeve (key 123) extends out of the bottom of the yoke. DO NOT move the
neutral indicator scale (key 125).
11. Loosen two set screws (key 121), and unscrew the bearing retainer flange (key 45). Take out the worm gear and
two thrust bearings (key 132), one on each side of the gear.
12. The worm shaft (key 51) and associated parts can be disassembled, if desired, by first removing the handwheel nut
(key 127) and the handwheel (key 58). Do not lose the small ball (key 141) and spring (key 142).
13. Loosen the set screw (key 52) for each worm shaft retainer (keys 48 and 49). Unscrew the two worm retainers
(keys 48 and 49). The ball bearings (key 50) will come out with the retainers.
Assembly for Side-Mounted Handwheel (Sizes 70, 76, and 87)
1. The front and back worm retainers (keys 48 and 49) each have a slot in their threads for a set screw (key 52). Pack
the ball bearings (key 50) with anti-seize lubricant (key 239), and insert one ball bearing in the back worm retainer
(key 49) as shown in figure 15.
2. Thread the back bearing retainer and ball bearing (keys 49 and 50) into the yoke. Align the slot in the bearing
retainer with the set screw hole in the yoke, insert the set screw (key 52), and tighten it.
3. Coat the worm shaft (key 51) threads with anti-seize lubricant (key 239), and slide the shaft into the yoke so that
the end of the shaft fits snugly into the back bearing retainer.
4. Insert the bearing in the front bearing retainer (key 49), and thread the retainer and ball bearing into the yoke. Align
the slot in the retainer with the hole in the yoke, insert the set screw (key 52), and tighten it.
5. Put the spring and ball (keys 141 and 142) in the handwheel (key 58). Slide the handwheel onto the worm shaft (key
51). Thread the hex nut (key 127) onto the worm shaft.
6. Pack the two needle bearings (key 132) and coat the worm gear (key 44) threads with anti-seize lubricant (key 239).
Insert the key (key 122), the bearings, and the worm gear in the yoke (key 73) as shown in figure 15.
7. Slots are cut in the threads of the bearing retainer flange (key 45). Thread the flange into the yoke so that the slots
and the holes for the set screws (key 121) align. Insert the screws, and tighten them.
8. The lower sleeve (key 123) has a milled groove in one end. Coat the sleeve threads with anti-seize lubricant (key
239), slide the end of the lower sleeve with the groove into the bearing retainer flange, turn the handwheel, and
feed the sleeve through the worm gear so that the slot in the lower sleeve engages the key (key 122) in the yoke.
Continue turning the handwheel until the lower sleeve protrudes 81 mm (3.19 inches) below the surface of the
yoke. The bottom of the lower sleeve should be even with the bottom of the extension on the neutral indicator.
9. Pack the thrust bearing (key 128) with anti-seize lubricant (key 239). Slide the actuator stem (key 144) and the
attached adjusting screw (key 131), pin (key 130), thrust bearing (key 128), spring seat (key 19), and spring adjuster
(key 74) into the yoke. The lower end of the stem slides through the lower sleeve (key 123) and the lower sleeve
slides into the adjusting screw (key 131), as shown in figure 15.
10. Position the actuator stem (key 144) against the valve stem. Clamp both stems between the two halves of the
stem connector (key 31), and be sure the threads are engaged properly on both stems. The stem connector should
not be closer than 3.2 mm (1/8 inches) to the lower sleeve when the actuator stem is in the retracted position. This
adjustment will provide approximately 3.2 mm (1/8 inches) of free travel of the lower sleeve in either direction for
manual operation. Fasten the halves together with the cap screws.
11. Put the actuator spring (key 18) in the yoke on the spring seat (key 19).