Bettis Operating & Maintenance Instructions Disassembly & Reassembly For The Following Models 521-SR, 521-SR-M3, 521-SR-M3HW, 721-SR, 721-SR-M3, AND 721-SR-M3HW Spring Return Series Hydraulic Actuators Manuals & Guides

Operation and Maintenance Manual

074947 Rev. B

September 2014

GH Bettis Disassembly and Reassembly

For Models 521-SR, 521-SR-M3, 521-SR-M3HW, 721-SR, 721-SRM3,
721-SR-M3HW Spring-Return Series Hydraulic Actuators

Operation and Maintenance Manual

074947 Rev. B

Table of Contents

Section 1: Introduction ���������������������������������������������������������1

Section 2: Support Items and Tools ���������������������������������������2

Section 3: Reference GH Bettis Materials �������������������������������3

Section 4: General Details �����������������������������������������������������4

Section 5: General Disassembly ���������������������������������������������5

Section 6: Rod Cover Disassembly �����������������������������������������6

Table of Contents

September 2014

Section 7: Spring Cylinder Removal ���������������������������������������7

Section 8: Housing Group Disassembly ���������������������������������8

Section 9: General Reassembly ����������������������������������������������9

Section 10: Center Housing Group Reassembly �������������������10

Section 11: Spring Cylinder Reassembly ������������������������������ 11

Section 12: Rod Cover Reassembly ��������������������������������������13

Section 13: Actuator Testing �����������������������������������������������14

Section 14: Return to Service ����������������������������������������������15

Section 15: Document Revision �������������������������������������������18

Appendix A: List of Drawings �����������������������������������������������19

Table of Contents

I

Section 1: Introduction

September 2014

Section 1: Introduction

1. This service procedure is offered as a guide to enable general maintenance to
be performed on GH Bettis 521-SR, 521-SR-M3, 521-SR-M3HW, 721-SR, 721-SR­M3 and 721-SR-M3HW hydraulic actuators. When the model number has "S" as
a suffix, then the actuator is special and may have some differences that are
not included in this procedure.

2. The maximum recommended service interval for this series actuators is five
years. Storage time is counted as part of the service interval.

NOTE:

Complete actuator refurbishment requires that the actuator be dismounted from the
valve.

Operation and Maintenance Manual

074947 Rev. B

NOTE:

This product is only intended for use in large-scale fixed installations excluded from the
scope of Directive 2011/65/EU on the restriction of the use of certain hazardous
substances in electrical and electronic equipment (RoHS 2).

1

Introduction

Operation and Mainetance Manual

074947 Rev. B

Section 2: Support Items and Tools

Section 2: Support Items and Tools

Seal/Service Kit, commercial leak testing solutions and non-hardening thread sealant.
General Tools two each medium standard screwdriver, small standard screwdriver with
corners rounded, putty knife, rubber or leather mallet, torque wrench (up to 2,000
inch-pound), refer to Table 3 for recommended tool styles and size.

September 2014

Support Items and Tools

2

Section 3: Reference GH Bettis Materials

September 2014

Operation and Maintenance Manual

074947 Rev. B

Section 3: Reference GH Bettis Materials

Assembly Drawing 065670 for failing clockwise (close) actuators.

3

Reference GH Bettis Materials

Operation and Mainetance Manual

074947 Rev. B

Section 4: General Details

1. Numbers in parentheses ( ), indicate the bubble number (reference number)
used on the GH Bettis Assembly Drawing, Exploded Detail Drawing, and
actuator parts lists.

2. This procedure is written using the stop screw side of the housing (1-10) as a
reference, and this side will be considered the front of the actuator, and the
housing cover (1-20) as the top of the actuator.

3. Refer to Table 1 of this instruction for approximate actuator weights.

4. To ensure correct reassembly; that is, with spring on same end of housing as
was, mark or tag right or left and mark mating surfaces.

5. When removing seals from seal grooves, use a small screwdriver with sharp
corners rounded off or a commercial seal removing tool.

Section 4: General Details

September 2014

6. Use a non-hardening thread sealant on all pipe threads.

7. Disassembly of actuator should be done in a clean area on a work bench when
possible.

8. LUBRICATION REQUIREMENTS:

a. Standard and high-temperature service (-20°F to +350°F) use

Kronaplate 100. This lubricant is provided in the GH Bettis Service/Seal
Kit.

b. Low-temperature service (-50°F to +150°F) use Kronaplate 50.

This lubricant needs to be purchased from distributors of Kronaplate.
For distributors of Kronaplate lubricant in your area, call 800-428-7802.

9. FLUID REQUIREMENTS:

a. Standard and high-temperature service (-20°F to +350°F) use Dexron II

or Shell Tellus T-32 Automatic Transmission Fluid.

b. Low-temperature service (-50°F to +150°F) use Exxon Univis J13 or HVI

13 Hydraulic Fluid.

General Details

4

Section 5: General Disassembly

September 2014

Operation and Maintenance Manual

Section 5: General Disassembly

1. Remove all operating pressure from actuator spring cylinder (4-10), allowing
the spring to stroke. The spring will rotate the yoke to the fail position.

2. Remove all piping and any accessories mounted on actuator.

3. If the actuator is equipped with a M3 jackscrew override, make sure that
the jackscrew (2-120) does not engage the piston rod (2-10).

4. For actuators equipped with M3HW jackscrew override with handwheel option,
remove hex nut (8-30), lock washer (8-20), and handwheel (8-10).

5. Remove the pipe plug (2-180) and drain the hydraulic fluid from the cylinder.

074947 Rev. B

6. Remove breather (4-20) from end of spring cylinder assembly (4-10).

7. Measure the exposed length of the right and left stop screws (1-60) and record
each before loosening.

8. Remove socket cap screws (1-120) from position indicator (1-110), yoke weather
cover (6-110), and remove position indicator/yoke weather cover.

9. Remove snubber (1-130) from housing (1-10).

10. If not already off the valve, then remove actuator from valve and valve
mounting bracket.

5

General Disassembly

Operation and Mainetance Manual

074947 Rev. B

Section 6: Rod Cover Disassembly

Section 6: Rod Cover Disassembly

1. Unscrew and remove the four rod cover ferry head screws (2-100) and gasket
seals (6-80).

2. Remove the rod cover (2-60), taking care not to disengage the grooved
bushing (2-50).

3. For actuators equipped with M3 or M3HW jackscrew override, the following
steps will be used for disassembly of the M3 from the rod cover (2-60).
Unless the M3 is to be removed for replacement, the M3 need not be
disassembled from the rod cover.

a. With the rod cover (2-60) on a work bench, lubricate jackscrew

assembly (2-120) threads with lubricant.

b. Loosen seal nut (2-130) all the way back to the welded nut.

September 2014

c. Thread the jackscrew assembly (2-120) into the rod cover (2-60) until

the pin (2-150) and washer (2-160) is exposed.

d. Using a 3/16-inch pin punch, drive out and remove pin (2-150).

e. Remove washer (2-160).

f. Thread the jackscrew assembly (2-120) out and remove from the rod

cover.

Rod Cover Disassembly

6

Section 7: Spring Cylinder Removal

September 2014

Operation and Maintenance Manual

Section 7: Spring Cylinder Removal

1. When the spring cartridge is installed in the spring cylinder, the spring is under
compression "pre load". DO NOT remove the spring cartridge until the actuator
has the "pre load" removed. Remove Spring cartridge "pre load” as follows:
Locate the stop screw (1-60) that is on the opposite side of the housing from
the spring cylinder (4-10). Loosen jam nut (1-70). Unscrew and remove stop
screw (1-60).

WARNING: DO NOT CUT APART SPRING CARTRIDGE

Under no circumstances should the spring cartridge (5) be cut apart, as the spring is
pre-loaded and the spring cartridge welded together.

2. Secure the chain wrench around the spring cylinder (4-10) as close to the
welded end cap as possible. Using a mallet, break the cylinder loose and then
remove the cylinder by rotating in a counterclockwise direction. When setting
aside,
care should be taken to protect the chamfered edge and cylinder threads.

074947 Rev. B

3. Due to the weight and the nature of a pre-loaded assembly, caution should be
exercised when handling the spring cartridge (5). The spring cartridge (5) is
unattached and is only contained by the spring cylinder (4-10).

4. Carefully remove spring cartridge (5) from spring cylinder (4-10) by slightly
tilting open end of cylinder down.

5. Unscrew and remove standard hex lock nut (2-70) from piston rod (2-10).

6. Remove the piston (2-20).

7. Unscrew and remove the four cylinder adapter ferry head screws (2-90) and seal
gaskets (6-80).

8. Remove the cylinder adapter (2-30), taking care not to scratch the piston rod
(2-10) or disengage the rod bushing (2-40).

7

Spring Cylinder Removal

Operation and Mainetance Manual

074947 Rev. B

Section 8: Housing Group DIsassembly

Section 8: Housing Group Disassembly

1. Remove cover screws (1-30) and seal gaskets (6-100).

2. Remove the housing cover (1-20).

3. Rotate the yoke arms to the center position.

4. Remove the upper yoke roller (1-50).

5. Lift out and remove yoke pin (1-40).

6. Holding rod bushing (2-40) in place, pull the piston rod (2-10) out through the
rod bushing (2-40).

7. Lift out the yoke (1-140) from the housing cavity.

September 2014

8. Remove the lower yoke roller (1-50).

9. Remove cylinder adapter rod bushing (2-40) and the grooved rod cover rod
bushing (2-50) from housing (1-10).

10. Remove the remaining stop screw (1-60), jam nut (1-70), and gasket seal (6-90).
Be sure to identify this stop screw.

11. It is not necessary to remove housing pipe plug (1-100) or cylinder adapter pipe
plug (2-110).

Housing Group Disassembly

88

Section 9: General Reassembly

September 2014

Operation and Maintenance Manual

Section 9: General Reassembly

1. Remove all old seals and gaskets, taking care not to scratch or damage seal
grooves.

2. All parts should be thoroughly inspected. Particular attention should be
directed to threads, sealing surfaces and areas that will be subjected to
sliding motion. Sealing surfaces must be free of deep scratches, pitting,
corrosion and blistering, or flaking coating.

3. After inspection, the parts should be carefully cleaned to remove all dirt and
gasket material.

074947 Rev. B

99

General Reassembly

Operation and Mainetance Manual

074947 Rev. B

Section 10: Center Housing Group Reassembly

September 2014

Section 10: Center Housing Group

Reassembly

1. If removed, install a pipe plug (1-100) into the drain port of the housing (1-10).

2. Install one of the yoke O-ring seals (6-20) into groove in the housing bore.

3. Apply lubricant to the yoke bore in the body and arrange the body so that
the yoke bore is nearest to you. Lubricate the raised ribs in the bottom of the
housing.

4. Apply a generous amount of lubricant to the slots in the upper and lower yoke
arms of yoke (1-140).

5. Coat the bearing surfaces of the yoke (1-140) with lubricant and install into the
body. The wide yoke arm should be installed toward the top of the housing.

6. Coat the piston rod bushing (2-40) with hydraulic fluid. Install into the left
side of the housing (1-10) for clockwise actuators and on right side
for counterclockwise actuators.

7. Coat the grooved rod cover bushing (2-50) with lubricant. Install into right
side of the housing (1-10) for clockwise actuators and on left side for
counterclockwise actuators.

8. Coat one of the yoke roller (1-50) with lubricant and place into the lower yoke
arm slot nearest yoke trunnion.

9. Apply lubricant to the piston rod (2-10) and install into the housing through the
rod bushing. The threaded end should be on the left for clockwise actuators and
on the right for counterclockwise actuators.

10. Coat the yoke pin (1-40) with lubricant and install through the piston rod (2-10)
into the lower yoke roller (1-50).

11. Coat the remaining yoke roller (1-50) with lubricant and install over the yoke pin
and into the slot in the upper yoke arm.

12. Install the remaining yoke seal (6-20) into the housing cover (1-20).

13. Coat the yoke bore in the cover (1-20) with lubricant.

14. Install the cover gasket (6-60) onto the housing.

15. Install the housing cover (1-20) and the four cover screws (1-30) with gasket
seals (6 -100) onto the housing (1-10).

Center Housing Group Reassembly

1010

Section 11: Spring Cylinder Reassembly

September 2014

Operation and Maintenance Manual

074947 Rev. B

Section 11: Spring Cylinder Reassembly

1. Coat the piston rod seal (6-30) with hydraulic fluid and install, lip first, into the
cylinder adapter (2-30). Energizer ring of rod seal must face the cylinder adapter
(piston side).

2. Install one cylinder adapter gasket (6-70) onto the left side of the housing for
clockwise actuators or on the right for counterclockwise actuators.

3. Install the cylinder adapter (2-30) over the piston rod and retain with the
cylinder adapter ferry screws (2-90) and gasket seals (6-80). Arrange the cylinder
adapter (2 -30) so that the bleed valve (2-170) will be at the cylinder's highest
point when the actuator is installed on the valve. Care should be taken at this
point not to scratch the piston rod when installing the cylinder adapter.

4. If removed, install a pipe plug (2-110) into the cylinder adapter's spare pressure
port.

5. Coat the cylinder adapter O-ring seal (6-40) with hydraulic fluid and install in the
groove at the inner end of the threads of the cylinder adapter (2-30).

6. Coat the piston O-ring seal (6-50) with hydraulic fluid and install onto the piston rod.

7. Install the piston (2-20) onto the piston rod and retain with hex lock nut (2-70).
One side of the piston has a raised boss in the center that is counter bored to
accept an "O" ring. This side should be installed against the shoulder of the
piston rod. Torque the piston hex lock nut (2-70) to approximately 146 foot­pounds.

8. PISTON SEAL INSTALLATION:

a. Standard and High-Temperature Actuators:

Coat one piston U-Cup seals (6-10) with hydraulic fluid and install into
the innermost piston groove. The lips of the seals should point toward
the cylinder adapter.

b. Low-Temperature Actuators:

Apply hydraulic fluid to piston T-Seal assembly (6-10) and install into the
innermost piston seal groove. Install back-up ring on each side of T-Seal.
The T-Seal assembly is composed of a rubber seal and two back-up
rings.

1111

9. Push the piston in towards the housing as far as it will go.

10. Coat the cylinder threads and the piston stroke surface of cylinder bore
with hydraulic fluid.

Spring Cylinder Reassembly

Operation and Mainetance Manual

074947 Rev. B

11. Coat the outside of the spring with lubricant and insert the spring cartridge
assembly (5) into the spring cylinder (4-10). One end of the spring cartridge
assembly has a flat-face with a deep hole in it. This end should be inserted into
the cylinder first.

12. Install the spring cylinder (4-10), containing the spring cartridge, over the piston
and thread into the cylinder adapter (2-30). Tighten with a chain wrench.

13. Position Indicator Installation:

a. For spring-to-close actuators (clockwise), rotate the yoke to the

full-clockwise (CW) position. Position the yoke weather cover (6-110)
and position indicator (1-110) on the yoke (1-140) with the pointer
facing the piston rod (2-10) and perpendicular to the SR cylinder (4-10)
and rod cover (2-60).

b. For spring-to-open actuators (counterclockwise), rotate the yoke (1-140)

to full-counterclockwise (CCW) position. Position the yoke weather
cover (6 -110) and position indicator (1-110) on the yoke (1-140) with
the pointer facing the rod cover (2-60) and parallel to the piston rod
(2-10).

Section 11: Spring Cylinder Reassembly

September 2014

c. Install and tighten yoke position indicator/yoke weather cover screws

(1 -120). These screws will need to be rechecked for tightness after the
actuator has been cycled and tested.

14. Install the stop screws (1-60), gasket seals (6-90) and jam nuts (1-70).

Spring Cylinder Reassembly

1212

Section 12: Rod Cover Reassembly

September 2014

Operation and Maintenance Manual

Section 12: Rod Cover Reassembly

1. If the M3 jackscrew was removed from the rod cover, then preassemble the M3
into the rod cover (2-60), using the following procedures:

a. Install nut seal (2-130) onto jackscrew assembly (2-120) and thread until

up against the welded nut.

b. Apply a generous coating of lubricant to the M3 threads (2-120).

c. Thread the jackscrew assembly into the rod cover (2-60). Turn the

jackscrew until the end of the assembly protrudes out of the end of
the rod cover.

d. Install washer (2-160) and pin (2-150) as shown on assembly drawing.

The pin should be centered in the end of the jackscrew so it will not
touch the walls of the rod cover.

074947 Rev. B

e. Turn the jackscrew until the washer (2-160) just comes into contact

with the end of the rod cover (2-60).

f. If desirable, wipe away excess lubricant on jackscrew after operation.

If preferred, lubricant may be left on jackscrew to provide additional
corrosion protection.

g. Turn nut seal until fully tight against the rod cover.

2. Coat the remaining end cap gasket (6-70) with lubricant and install onto the
right side of the housing (1-10) for clockwise actuators, or the left side of the
housing for counterclockwise actuators.

3. Install the rod cover (2-60) over the exposed piston rod end (2-10).

4. Install and tighten the four rod cover screws (2-100) and seal gaskets (6-80).

1313

Rod Cover Reassembly

Operation and Mainetance Manual

074947 Rev. B

Section 13: Actuator Testing

1. All areas, where leakage to atmosphere may occur, are to be checked using a
leak testing solution.

2. All leak testing will use the Nominal Operating Pressure (NOP) as listed on the
actuator name tag or from Table 1 of this procedure.

3. Before testing for leaks, alternately apply and release NOP to the pressure side
of the piston to stroke the actuator fully. Repeat this cycle approximately five
times. This will allow the new seals to seek their proper working attitude.

4. Apply NOP to the pressure inlet port located in the cylinder adapter (2-30).

5. Apply leak-testing solution to the following areas:

a. The breather port hole in the end of the SR cylinder (4-10), checks the

piston to cylinder wall and piston to piston rod seals.

Section 13: Actuator Testing

September 2014

b. The threaded joint between the SR cylinder (4-10) and cylinder adapter

(2-30), checks the cylinder to cylinder adapter O-ring seal.

c. The joint between the cylinder adapter and the housing.

d. The snubber port hole located in the housing, checks the cylinder

adapter to piston rod seal.

6. Remove pressure from pressure inlet port located in the SR cylinder adapter.

7. If excessive leakage across the piston is noted, generally a bubble which breaks
three seconds or less after starting to form, the unit must be disassembled and
the cause of leakage must be determined and corrected.

8. If an actuator was disassembled and repaired, the above leakage test must be
performed again.

9. Perform Operational Test to the actuator to verify proper function of the
actuator.
This test must be done when the actuator is off the valve or when the valve
stem is not coupled to the actuator yoke.

10. Adjust the pressure regulator to the pressure rating indicated in Column "B" of
Table 1, for the model actuator being used.

Actuator Testing

11. Apply the above pressure to the actuator and allow the unit to stabilize.
The actuator should stroke a full 90 degrees travel with stops properly set.

12. Remove pressure from pressure inlet port located in the SR cylinder adapter.

1414

Section 14: Return to Service

September 2014

Operation and Maintenance Manual

Section 14: Return to Service

1. Reinstall the breather (4-20) into the end of the spring cylinder (4-10).

2. If supplied in the service kit, replace the software components of the snubber
(1-190), and then install the snubber into the housing.

3. Reinstall actuator to valve mounting bracket and valve.

4. Adjust both stop screws (1-60) back to settings recorded in Section 5, Step 6,
under General Disassembly.

5. Tighten both jam nuts (1-70) securely, while holding stop screws (1-60).

6. Reinstall any piping and accessories that were removed.

7. For actuators equipped with M3 jackscrew override and require an optional
handwheel, M3HW, install the handwheel using the following procedures:

074947 Rev. B

a. Place the handwheel (8-10) onto the welded nut.

The handwheel hub has a cast hexagon hole that fits over the welded nut.

b. Place lock washer (8-20) onto M3 up against handwheel hub.

c. Place hex nut (8-30) onto M3 and thread up against lock washer, torque

to 250 foot-pounds.

8. All accessories, including solenoid valves, positioners, pressure switches,
and others, should be hooked up and tested for proper operation and replaced,
if found defective.

1515

Return to Service

Operation and Mainetance Manual

074947 Rev. B

Table 1� Pressure Requirements and Limitations for Models 521 SRXX
and 721 SRXX Pneumatic Actuators

Section 14: Return to Service

September 2014

Nominal

Actuator

Model*

Operating

Pressure

(NOP)

521 SR40 40 330 400 228 27

521 SR60 60 345 400 217 40

521 SR80 80 360 400 207 52

521 SR100 100 375 400 197 70

521 SR125 125 390 450 183 84

521 SR150 150 410 450 169 100

521 SR200 200 440 450 142 136

721 SR40 40 180 250 129 28

721 SR60 60 195 250 116 42

721 SR80 80 210 250 104 55

721 SR100 100 225 300 93 69

721 SR125 125 240 300 79 85

721 SR150 150 260 300 66 100

721 SR200 200 300 300 7 165

Maximum
Operating

Pressure

(MOP)

Maximum

Hydrostatic

Test

Pressure

Maximum

Air Assist

Pressure

(MAAP)

Column B

Spring

Selection

Pressure

* Includes actuator models that have M3 and M3HW included in their model numbers,
for example, 521 SR40 M3.

Table 2� Weight for Models 521 SRXX and 721 SRXX

APPROXIMATE WEIGHTS (LBS) **

Actuator

Model

521 SRXX 105 108 110 121 123 12 5 13 6

521 SRXX

M3

521 SRXX

M3HW

721 SRXX 15 0 15 6 162 163 186 188 203

721 SRXX

M3

721 SRXX

M3HW

SR40 SR60 SR80 SR100 SR125 SR150 SR200

112 116 117 126 128 131 141

117 121 122 131 133 135 146

155 161 167 168 191 193 208

160 166 172 176 196 198 213

** Weights listed for each model are for bare actuators without valve mounting
brackets and accessories.

Return to Service

1616

Section 14: Return to Service

September 2014

Table 3� 521/721 SR and M3/HW Tool Style and Wrench Sizes

Operation and Maintenance Manual

074947 Rev. B

Item No� Wrench Size ** Description

Recommended

Wrench Style

1-30 9/16" Cover screws Socket

1-60 7/16" Stop screw

1-70 15/16" Stop screw nut

1-100 7/16" Housing drain plug

Open end or adjust-

able

Open end or adjust-

able

Open end or adjust-

able
1-120 3/16" Weather cover screws Allen
1-130 7/8" Snubber Deep socket

2-70 1-1/4" Piston/piston rod nut Socket

2-90 7/16"

Cylinder adapter

screws

12 point socket

2-100 7/16" Rod cover screws 12 point socket

2-110 7/16"

2-130 1-11/16" M3 nut seal

Cylinder adapter port

plug

Allen

Open end or adjust-

able

2-150 3/16" Spiral pin Pin punch

4-10 - - - - 7-1/2 OD Cylinder Chain Wrench
4-20 11/16" Cylinder Breather Open End

8-30 1-11/16"

M3 Handwheel Jam

Nut

Open End or Adjust-

able

(1) (3)

(1) (3)

(2)

(1)

(1)

(1)

(2)

** All tools are American standard inch.

(1) No alternate style recommended.

(2) Some actuators used heavy hex nuts in this location - wrench size will change to
1-13/16".

(3) Previous models used socket head cap screws - wrench style will change to Allen.

1717

Return to Service

Operation and Mainetance Manual

074947 Rev. B

Section 15: Document Revision

Section 15: Document Revision

Table 4� Revision Overview

ECN DATE REV BY * DATE

Released March 2001 A * COMPILED Colby 22 June 2006

19110 July 2006 B CHECKED John R 22 June 2006

APPROVED David McGee 18 July 2006

* Signatures on file Bettis Actuator & Controls, Waller, Texas

September 2014

Document Revision

1818

Appendix

September 2014

Operation and Maintenance Manual

074947 Rev. B

Appendix A: List of Drawings

A�1 Part No� VA065670, Hydraulic Actuator, Assy Dwg�

1919

Appendix

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