Bettis Service Instructions Disassembly and Reassembly For CBA Double Acting Series Pneumatic Actuators Manuals & Guides

Service Instructions

137464E Rev. E

May 2012

CBA Double-Acting Series Pneumatic Actuators

Disassembly and Reassembly

Service Instructions

137464E Rev. E

Table of Contents

Section 1: Introduction

1.1 General Service Information ......................................................................... 1

1.2 Denitions ................................................................................................... 2

1.3 General Safety Information ........................................................................... 2

1.4 Bettis Reference Materials ............................................................................. 3

1.5 Service Support Items .................................................................................. 3

1.6 Lubrication Requirements ............................................................................ 3

1.7 General Tool Information .............................................................................. 3

1.8 Actuator Weight ...........................................................................................4

Section 2: Actuator Disassembly

2.1 General Disassembly .................................................................................... 5

2.2 Pneumatic Cylinder Disassembly .................................................................. 5

2.3 Housing Disassembly ...................................................................................7

Table of Contents

May 2012

Section 3: Actuator Reassembly

3.1 General Reassembly ..................................................................................... 9

3.2 Actuator Reassembly per CBA Models Listed in Step 3.1.5.1 ....................... 10

3.3 Actuator Reassembly per CBA Models Listed in Step 3.1.5.2 ....................... 13

Section 4: Actuator Testing

4.1 Actuator Testing ......................................................................................... 20

Section 5: Document Revision ��������������������������������������������22

Appendix A: List of Tables ���������������������������������������������������23

Appendix B: List of Drawings ����������������������������������������������24

ITable of Contents

Section 1: Introduction

May 2012

Section 1: Introduction

1�1 General Service Information

1.1.1 This service procedure is offered as a guide to enable general maintenance to be
performed on Bettis CBA double acting series actuators. The following is a list of
general CBA models numbers.

Table 1� CBA Model Numbers

MODEL (1) MODEL (1) MODEL (1)

315 315-M3 315-M3HW
420 420-M3 420-M3HW
520 520-M3 520-M3HW
525 525-M3 525-M3HW
725 725-M3 725-M3HW

(1) Also includes actuator models with –10 and –11 as a sufx

Service Instructions

137464E Rev. E

NOTE:

When the actuator model number has “-S” as a sufx then the actuator is special and may

have some differences that may not be included in this procedure.

1.1.2 Normal recommended service interval for this actuator series is ve years.

NOTE:

Storage time is counted as part of the service interval.

1.1.3 This procedure is applicable with the understanding that all electrical power and
pneumatic pressure has been removed from the actuator.

1.1.4 Remove all piping and mounted accessories that will interfere with the module(s)
that are to be worked on.

1.1.5 This procedure should only be implemented by a technically competent technician
who should take care to observe good workmanship practices.

1.1.6 Numbers in parentheses, ( ) indicate the bubble number (reference number) used
on the Bettis Assembly Drawing and Actuator Parts List.

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

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

CAUTION: FOLLOW MANUFACTURER'S INSTRUCTIONS

Apply the thread sealant per the manufacture’s instructions.

1.1.9 Bettis recommends that disassembly of the actuator should be done in a clean area
on a workbench.

1

Introduction

Service Instructions

137464E Rev. E

1�2 Definitions

WARNING:

If not observed, user incurs a high risk of severe damage to actuator and/or fatal injury to personnel.

CAUTION:

If not observed, user may incur damage to actuator and/or injury to personnel.

NOTE:

Advisory and information comments provided to assist maintenance personnel to carry out
maintenance procedures.

Section 1: Introduction

May 2012

NOTE:

This product is only intended for use in large-scale xed 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).

M3:

Jackscrew or jackscrew assembly.

ES:

Extended Stop(s)

1�3 General Safety Information

1.3.1 Products supplied by Bettis, in its “as shipped” condition, are intrinsically safe if the
instructions contained within this Service Instruction are strictly adhered to and

executed by well trained, equipped, prepared and competent personnel.

WARNING: FOLLOW WARNING AND CAUTION SIGNS

For the protection of personnel working on Bettis actuators, this procedure should be
reviewed and implemented for safe disassembly and reassembly. Close attention should
be noted to the WARNINGS, CAUTIONS and NOTES contained in this procedure.

Introduction

WARNING: FOLLOW COMPANY SAFETY PROCEDURES

This procedure should not supersede or replace any customer’s plant safety or work

procedures. If a conict arises between this procedure and the customer’s procedures the

differences should be resolved in writing between an authorized customers representative
and an authorized Bettis representative.

2

Section 1: Introduction

May 2012

1�4 Bettis Reference Materials

1.4.1 CBAXXX Assembly Drawing use part number 129738.

1.4.2 CBAXXX-M3HW Assembly Drawing use part number 129740.

1�5 Service Support Items

1.5.1 Bettis Service Kit.

1.5.2 Commercial leak testing solution.

1.5.3 Non-hardening thread sealant.

1�6 Lubrication Requirements

1.6.1 The actuator should be re-lubricated at the beginning of each service interval
using the following recommended lubricants.

Service Instructions

137464E Rev. E

NOTE:

Lubricants other than those listed in steps 1.6.2 should not be used without prior written
approval of Bettis Product Engineering. The lubricant item number on some assembly
drawings is item (5) while the Bettis service kits lubricant item number is item number (500).

1.6.2 All temperature services (-50°F to +350°F)/(-45.5°C to 176.6°C) use Bettis ESL-5
lubricant. ESL-5 lubricant is contained in the Bettis Module Service Kit in tubes and
the tubes are marked ESL-4,5 & 10 lubricant.

1�7 General Tool Information

1.7.1 All threads on CBA series actuators are Inch Unied and NPT.

1.7.2 All tools/Hexagons are American Standard inch. Two adjustable wrenches, Allen
wrench set, small standard screwdriver with sharp edges rounded off, medium size

standard screwdriver, diagonal cutting pliers, external snap ring pliers, at le, drive

ratchet / deepwell socket set and torque wrench (up to 2,000 inch pounds / 226 N-m).

3

Introduction

Service Instructions

137464E Rev. E

1�8 Actuator Weight

Table 2� Actuator Weight

Section 1: Introduction

May 2012

Actuato r

Model

CBA LB KG CBA LB KG

315 20 9.1 520-M3HW 38 17.2

315-M3 23.2 10.5 525 44 20

315-M3HW 25 11.3 525-M3 50 22.7

420 22 10 525-M3HW 56 25.4

420-M3 29.4 13.4 725 68 31

420-M3HW 33 15 725-M3 75 34

520 28 12.7 725-M3HW 81 37

520-M3 34.4 15.7

(1) Weight is for bare actuator without accessories or valve adaptation.

Approximate weight (1)

Actuator

Model

Approximate weight (1)

Introduction

4

Section 2: Actuator Disassembly

May 2012

Section 2: Actuator Disassembly

2�1 General Disassembly

WARNING: DANGEROUS GAS AND/OR LIQUIDS

It is possible, that the actuator may contain a dangerous gas and/or liquids. Ensure that

all proper measures have been taken to prevent exposure or release of these types of

contaminants before commencing any work.

CAUTION: DO NOT EXCEED OPERATING PRESSURE

Pressure applied to the actuator is not to exceed the maximum operating pressure rating

listed on the actuator name tag.

Service Instructions

137464E Rev. E

NOTE:

Before starting the general disassembly of the actuator it is a good practice to operate
actuator with the pressure used by the customer to operate the actuator during normal
operation. Notate and record any abnormal symptoms such as jerky or erratic operation.

2.1.1 Remove all operating pressure from actuator.

2.1.2 Record the settings of stop screw or M3 jackscrews (1-70) and (4-30) before stop
screws are loosened or removed.

NOTE:

In place of stop screws the actuator may be equipped with one or two ES

(ES = Extended Stops) or M3/M3HW (1-70) located on outboard end of housing (1-10) and

(4-30) at the end cap (4-20).

2�2 Pneumatic Cylinder Disassembly

NOTE:

Review Section 2 steps 2.1.1 through 2.1.2 before proceeding with cylinder disassembly.

2.2.1 Remove hex nut (4-40) as follows: CBA315 through CBA725 standard end cap stop

screw or extended stop (ES) use step 2.2.1.1. CBA/CBB315 through CBA725 with

-M3 or -M3HW use step 2.2.1.2.

2.2.1.1 For CBA315 through 725: end cap stop screw or extended stop screw

(ES)

2.2.1.1.1 Loosen and remove hex nut (4-40) and washer (4-90) from stop
screw (4-30) located in end cap (4-20).

5

Actuator Disassembly

Service Instructions

137464E Rev. E

NOTE:

CBA315/420/520/525/725-M3 or M3HW models the M3 jackscrew (1-70) can not be removed
now. The M3 used in these models can be removed later in this procedure using step 2.2.8.

ES (4-30), stop screw (4-30) or CBA315-M3 (1-70) does not require removal from end cap
(4-20) unless replacing with a new ES, stop screw or M3.

2.2.2 Remove housing side hex nut (8-20) from center bar (8-10).

2.2.3 Remove outer end cap (4-20) with center bar (8-10) from outboard end of cylinder (4-10).

2.2.4 While holding housing torque shaft (1-30), pull cylinder (4-10) away from housing (1-10).

2.2.5 Slide cylinder (4-10) over piston seal (5-40) and remove.

2.2.6 Remove piston (4-50) from housing (1-10).

Section 2: Actuator Disassembly

2.2.1.1.2 Remove stop screw (4-30) from the end cap (4-20).

2.2.1.2 For CBA315/420/520/525/725-M3 or M3HW:

2.2.1.2.1 Remove retainer ring (12-30) and groove pin (12-20) from

optional hex drive hub or from hand wheel (12-10).

2.2.1.2.2 Remove optional hex drive hub or hand wheel (12-10) from M3
jackscrew (1-70).

2.2.1.2.3 Loosen and remove hex nut (1-80) from M3 jackscrew (1-70).

May 2012

NOTE:

Piston (4-50) is an assembly made up of one roll pin and one yoke pin; do not attempt to
disassemble the piston assembly.

2.2.7 On actuator models CBA415/520/725 remove cylinder adapter (4-15) from ange
of housing (1-10).

2.2.8 M3 JACKSCREW REMOVAL FROM END CAP (4-20).

2.2.8.1 CBA315/415 with a M3 remove M3 jackscrew (1-70) from the backside of

end cap (4-20).

2.2.8.2 CBA420/520/525/725 with a M3 jackscrew remove per following steps.

2.2.8.2.1 Remove retainer ring (5-60) from M3 adapter (4-55).

2.2.8.2.2 Remove M3 adapter (4-55) from end cap (4-20).

NOTE:

The M3 adapter will be removed from backside of end cap (4-20) with the M3 jackscrew.

ES (4-30), stop screw (4-30) or CBA315-M3 jackscrew (1-70) does not require removal
from end cap (4-20) unless replacing with a new ES, stop screw or M3.

Actuator Disassembly

6

Section 2: Actuator Disassembly

May 2012

2�3 Housing Disassembly

NOTE:

Review Section 2 steps 2.1.1 through 2.1.2 before proceeding with housing disassembly.

2.3.1 Remove hex nut (1-80) as follows: CBA315 through 725 standard housing stop

screw or extended stop (ES) use step 2.3.1.1. CBA315-M3/M3HW through

CBA725-M3/M3HW use step 2.3.1.2.

2.3.1.1 CBA315 through 725 housing stop screw or extended stop screw (ES)

2.3.1.1.1 Loosen and remove hex nut (4-40) and washer (1-90) from stop
screw (1-70) located in housing (1-10).

2.3.1.1.2 Remove stop screw (1-70) from the end of housing (1-10).

2.3.1.2 CBA315/420/520/525/725-M3 or M3HW

2.3.1.2.1 Remove retainer ring (12-30) and groove pin (12-20) from

optional hex drive hub or from hand wheel (12-10).

2.3.1.2.2 Remove optional hex drive hub or hand wheel (12-10) from M3
jackscrew (1-70).

2.3.1.2.3 Loosen and remove hex nut (1-80) from M3 jackscrew (1-70).

Service Instructions

137464E Rev. E

NOTE:

CBA315, 420, 520, 525, 725-M3 or M3HW models the M3 can not be removed now. The
M3 used in these models can be removed later in this procedure using steps 2.3.7 or 2.3.8.

Stop screw (1-70) does not require removal from the housing (1-10) unless replacing with a
new ES, stop screw or M3.

2.3.2 Remove both retaining rings (1-60) from torque shaft (1-30).

2.3.3 The following steps may be required before disassembly can continue.

2.3.3.1 If torque shaft (1-30) has any raised burrs or sharp edges they should be
removed.

NOTE:

When removing burrs and sharp edges, remove as little metal as possible.

7

Actuator Disassembly

Service Instructions

137464E Rev. E

2.3.4 Remove the torque shaft (1-30) by pushing it out one side of housing (1-10).

2.3.5 Remove yoke key (1-40) and yoke key spring (1-50) from torque shaft (1-30).

2.3.6 Remove yoke (1-20) from housing (1-10).

2.3.7 Actuator models CBA315/415 with a M3 or M3HW mounted in the outboard end

NOTE:

The M3 jackscrew (1-70) will be removed from the inside of housing (1-10).

2.3.8 Actuator models CBA420/520/525/725 with a M3 or M3HW mounted in the

Section 2: Actuator Disassembly

May 2012

2.3.3.2 If there is excessive paint build-up on torque shaft (1-30) it should be

removed.

of housing (1-10) remove M3 jackscrew (1-70) from housing (1-10).

outboard end of housing (1-10) complete steps 2.3.8.1 and 2.3.8.2.

2.3.8.1 Remove retainer ring (2-40) from M3 adapter (1-90).

2.3.8.2 Remove M3 adapter (1-90) from housing (1-10).

NOTE:

The M3 adapter will be removed from the inside of housing (1-10) with the M3 jackscrew (1-70).

Actuator Disassembly

8

Section 3: Actuator Reassembly

May 2012

Section 3: Actuator Reassembly

3�1 General Reassembly

CAUTION: CHECK SHELF LIFE OF SEALS

Only new seals that are still within the seals expectant shelf life should be installed into the

actuator being refurbished.

3.1.1 Remove and discard all old seals and gaskets.

3.1.2 All parts should be cleaned to remove all dirt and other foreign material prior to
inspection.

3.1.3 All parts should be thoroughly inspected for excessive wear, stress cracking,
galling and pitting. Attention should be directed to threads, sealing surfaces
and areas that will be subjected to sliding or rotating motion. Sealing surfaces of
the cylinder, torque shaft and center bar must be free of deep scratches, pitting,

corrosion and blistering or aking coating.

Service Instructions

137464E Rev. E

CAUTION: REPLACE WITH NEW PARTS

Actuator parts that reect any of the above listed characteristics may need replacement

with new parts.

3.1.4 INSTALLATION LUBRICATION INSTRUCTIONS: Use the correct lubrication as

dened in Section 1 step 1.6.

3.1.4.1 Before installation, lightly coat with approved grease, all moving parts.

3.1.4.2 Lightly coat all seals with lubricant, before installing into seal grooves.

3.1.5 REASSEMBLE THE ACTUATOR MODELS PER THE FOLLOWING LISTING:

3.1.5.1 Reassemble the following models per steps 3.2: CBA315/420/520/525

and CBA725.

3.1.5.2 Reassemble the following models per steps 3.3: CBA315-M3, 315-

M3HW, 420-M3, 520-M3, 525-M3 and CBA725-M3 (also included M3
jackscrew with hand wheels i.e. M3HW).

9

Actuator Reassembly

Service Instructions

137464E Rev. E

Section 3: Actuator Reassembly

May 2012

3�2 Actuator Reassembly per CBA Models Listed in

Step 3�1�5�1

NOTE:

Review Section 3 steps 3.1.1 through 3.1.5 before proceeding with actuator reassembly.

The following steps used to reassemble the following models: CBA315, 420, 520, 525 and

725. Use assembly drawing part numbers 129738 for this section.

In section 3.2 where the step indicates to “lubricate, coat or apply lubricant”, use lubricant

as identied in Section 1 step 1.6 for lubricating the part being installed.

3.2.1 Apply a coating of lubricant to the torque shaft holes located on each side of
housing (1-10).

3.2.2 Prior to installing new seals: Fit the torque shaft snap ring groove with installation
rings that come with the CBA service kits. These rings help guide the torque-shaft
through the housing and seals which will prevent seal damage. It is a good idea to

rst take out both old seals, then install the rings onto the shaft, and then install

seals in housing. Once this is done, remove install rings and proceed. See CBA LCD
PAK installation instructions, Part Number 153955, for details.

3.2.3 Coat torque shaft LCD PAK seals (2-20) with lubricant and install in one of the
grooves located in the torque shaft bore of the housing (1-10).

NOTE:

The cup/lip of torque shaft seal will be installed facing inward into the housing.

3.2.4 Coat yoke (1-20) with lubricant and install into housing (1-10). Apply a generous
amount of lubricant to the slots in the arms of yoke (1-20).

3.2.5 Insert the yoke key spring (1-50), with the ends pointing down, into the slot in the
torque shaft (1-30) and place the yoke key (1-40) on top of the spring with the
tapered side outward.

WARNING: FOLLOW YOKE KEY INSTALLATION STEPS

If the yoke key (1-40) is installed incorrectly the housing may be damaged when next

disassembly occurs. Refer to assembly drawing for correct yoke key spring and yoke key
orientation.

3.2.6 Hold the yoke key (1-40) down with your thumb; insert the torque shaft (1-30) by
gently rotating it into the housing (1-10) and yoke (1-20) on the opposite side of
the installed torque shaft wiper seal (2-20).

Actuator Reassembly

10

Section 3: Actuator Reassembly

May 2012

NOTE:

Torque Shaft should be installed with key rotated 180 degrees opposite yoke key slot.

When the torque shaft (1-30) is ush with the housing (1-10) push the torque shaft (1-30)
through until the empty seal groove is exposed. Install the other torque shaft wiper seal

(2-20) into the groove.

The cup of the torque shaft wiper seal again needs to be installed facing inward into the
housing.

Two new retaining rings (1-60) are contained in the Bettis CBA Service Kits.

3.2.7 Install one of the new retaining rings (1-60) onto the exposed end of the torque
shaft, making certain it is properly seated in the groove of the torque shaft (1-30).
Gently push and rotate the torque shaft (1-30) until the retaining ring (1-60) is
pressed against the housing (1-10). Install the other retaining ring (1-60) to the
other side of the torque shaft (1-30).

Service Instructions

137464E Rev. E

CAUTION: CHECK YOKE KEY ALIGNMENT

Rotate the torque shaft until the yoke key snaps into the yoke keyway.

3.2.8 Rotate the torque shaft (1-30) so that the arms of yoke (1-20) point out the open
end of housing (1-10).

3.2.9 Coat o-ring seal (5-20) with lubricant and install into inner diameter seal groove
located in the center bar hole of housing (1-10).

3.2.10 Coat entire length of center bar (8-10) with lubricant including the threads.

3.2.11 Install hex nut (8-20) onto one end of center bar (8-10).

3.2.12 Insert center bar (8-10) into the center hole of housing (1-10). Slide center bar

through housing until the hex nut (8-20) is ush against housing (1-10).

3.2.13 Coat one o-ring seal (5-10) with lubricant and install onto outer diameter ange
located on housing adapter end of housing (1-10).

3.2.14 Actuators equipped with cylinder adapter (4-15), models CBA520/725, do steps as follows:

3.2.14.1 Install cylinder adapter (4-15) onto the ange of housing (1-10) and over

o-ring seal (5-10), with the stepped outer diameter, of cylinder adapter
(4-15), facing away from housing (1-10).

3.2.14.2 Install one o-seal (5-15) onto stepped diameter of cylinder adapter (4-15).

3.2.15 Coat the following areas of piston (4-50) with lubricant: The outer diameter seal

groove, inner diameter seal groove, head of piston and exposed ends of yoke pin.

3.2.16 Coat o-ring seal (5-20) with lubricant and install in the internal seal groove in the
head of piston (4-50).

3.2.17 Coat seal (5-40) with lubricant and install into outer diameter seal groove of piston

(4-50). The piston seal will t very loosely in the outer diameter seal groove.

3.2.18 Install bushing (4-80) between the two arms of yoke (1-20).

3.2.19 With the piston head facing away from housing (1-10) and with yoke pin up, install
piston (4-50) onto center bar (8-10).

3.2.20 Carefully slide piston (4-50) along center bar (8-10) until yoke pin engages the two
slots in the arms of yoke (1-20).

11

Actuator Reassembly

Service Instructions

137464E Rev. E

NOTE:

While holding the center bar ush against the housing, push piston (4-50) into housing (1-

10) as far as the piston will go. Check to see that bushing (4-80) is positioned between the

yoke (1-20) and the stem of piston (4-50).

3.2.21 Apply a coating of lubricant to entire bore of cylinder (4-10).

3.2.22 Pneumatic cylinder installation:

3.2.23 End cap seal installation.

3.2.24 Install end cap (4-20) onto center bar (8-10) and into cylinder (4-10).

Section 3: Actuator Reassembly

May 2012

3.2.22.1 For CBA520 and 725 models, install the lubricated cylinder (4-10) over

the piston and up-against the o-ring seal (5-15) on the stepped diameter

ange of cylinder adapter (4-15).

3.2.22.2 For CBA315, 420 and 525 models, install the lubricated cylinder (4-10)

over the piston and up-against the o-ring seal (5-10) on the ange of

housing (1-10).

3.2.23.1 Coat o-ring seal (5-20) with lubricant and install in the internal seal

groove of end cap (4-20).

3.2.23.2 Install o-ring seal (5-15) onto outer diameter of end cap (4-20).

NOTE:

Position the end cap (4-20) so that the inlet port is at the bottom and the ES or stop screw
(4-30) is at the top.

WARNING: FOLLOW END CAP INSTALLATION STEPS

If step 3.3.24 is not completed as described, the center bar O-ring seals (5-20) may become
a source of pressure leakage and cause the actuator to fail.

3.2.25 Install the second hex nut (8-20) onto the cylinder end of center bar (8-10). Adjust

the two hex nuts (8-20) such that the approximate same number of threads is
exposed on the ends of the center bar (8-10).

WARNING: DO NOT ALLOW END CAP TO ROTATE

Do not allow end cap (4-20) to rotate during center bar tightening. The end cap must
maintain the position as described in step 3.2.23.

Actuator Reassembly

12

Section 3: Actuator Reassembly

May 2012

3.2.26 Tighten center bar (8-10) to the proper torque as specied in the following chart.

Table 3� Tightning Torque Center Bar

Service Instructions

137464E Rev. E

CBA Actuator

Model

315 55 75
420 AND 520 100 136
525 AND 725 130 176

3.2.27 If removed install ES or stop screw (4-30) into end cap (4-20).

3.2.28 Install O-ring seal (5-30) onto the ES or stop screw (4-30). Install the O-ring seal
against the end cap (4-20).

3.2.29 Install new washer (4-90) onto the ES or stop screw (4-30). Install the washer
against the end cap (4-20).

3.2.30 Install hex nut (4-40) onto stop screw (4-30)

NOTE:

Leave hex nut hand tight.

3.2.31 If removed install ES or stop screw (1-70) into housing (1-10).

3.2.32 Install o-ring seal (2-30) and washer (1-90) onto the ES or stop screw (1-70).
Install O-ring seal against the housing (1-10).

3.2.33 Install hex nut (4-40) onto ES or stop screw (1-70). Leave hex nut hand tight.

3.2.34 Adjust both stop screws or ES (1-70) and (4-30) back to setting recorded in Section

2 step 2.1.2 under General Disassembly. Tighten hex nuts (4-40) securely, while

holding the ES or stop screws in place/position.

FT� LBS� N-m

Maximum torque

3�3 Actuator Reassembly per CBA Models Listed in

Step 3�1�5�2

NOTE:

The following steps are used to reassemble the following models: CBA315-M3,
CBA420-M3, CBA520-M3, CBA525-M3 and CBA725-M3 (also included M3 jackscrew with
hand wheels i.e. M3HW). Use assembly drawing part number 129740 for this section.

In section 3.3 where the step indicates to “lubricate, coat or apply lubricant”, use lubricant

as identied in Section 1 step 1.6 for lubricating the part being installed.

3.3.1 M3 JACKSCREW (1-70) HOUSING INSTALLATION FOR
CBA315-M3 AND CBA315-M3HW MODEL ACTUATORS.

3.3.1.1 Apply a light coating of lubricant to the threads of M3 jackscrew (1-70).

NOTE:

M3 jackscrew (1-70) will be installed from the inside of housing (1-10).

13

Actuator Reassembly

Service Instructions

137464E Rev. E

NOTE:

Rotate the M3 jackscrew into the housing until the inboard end of the M3 jackscrew is up
against the inside of housing (1-10).

NOTE:

Move the O-ring seal (2-30) down the M3 jackscrew until it is next to the housing (1-10).

NOTE:

Rotate the hex nut down the M3 jackscrew until it is next to the housing (1-10).

Section 3: Actuator Reassembly

3.3.1.2 Insert and rotate M3 jackscrew (1-70) into housing (1-10).

3.3.1.3 Install O-ring seal (2-30) onto M3 jackscrew (1-70).

3.3.1.4 Install hex nut (1-80) onto M3 jackscrew (1-70).

May 2012

3.3.1.5 Continue reassembly at step 3.3.3.

3.3.2 M3 JACKSCREW HOUSING INSTALLATION FOR CBA420-M3 THRU CBA725-M3
MODEL ACTUATORS (includes –M3HW models).

3.3.2.1 Apply a coating of lubricant to outer diameter and inner diameter threads

of M3 adapter (1-90).

3.3.2.2 Coat O-ring seal (2-45) with lubricant and install into outer diameter seal

groove located in the M3 adapter (1-90).

3.3.2.3 Apply a light coating of lubricant to the threads of M3 jackscrew (1-70).

3.3.2.4 Insert and rotate M3 jackscrew (1-70) into M3 adapter (1-90).

NOTE:

Rotate the M3 jackscrew into the adapter until the inboard end of the jackscrew is up
against the adapter.

M3 adapter (1-90) will be installed from the inside of housing (1-10).

3.3.2.5 Install M3 adapter (1-90) into housing (1-10).

3.3.2.6 Install retainer ring (2-40) into outboard groove located on the outer

diameter of M3 adapter (1-90).

3.3.2.7 Install O-ring seal (2-30) onto M3 jackscrew (1-70).

Actuator Reassembly

NOTE:

Move the O-ring seal (2-30) down the M3 jackscrew until it is next to the M3 adapter.

3.3.2.8 Install hex nut (1-80) onto M3 jackscrew (1-70).

14

Section 3: Actuator Reassembly

May 2012

NOTE:

Rotate the hex nut down the M3 jackscrew until it is next to the M3 adapter.

3.3.3 Apply a coating of lubricant to the torque shaft holes located on each side of
housing (1-10).

3.3.4 Coat rod wiper seals (2-20) with lubricant and install in the grooves located in the
torque shaft through holes located on each side of housing (1-10).

NOTE:

The cup of rod wiper seal will be installed facing down into the housing.

3.3.5 Coat yoke (1-20) with lubricant and install into housing (1-10). Apply a generous
amount of lubricant to the slots in the arms of yoke (1-20).

3.3.6 Insert the yoke key spring (1-50), with the ends pointing down, into the slot in the
torque shaft (1-30) and place the yoke key (1-40) on top of the spring with the
tapered side outward.

Service Instructions

137464E Rev. E

WARNING: FOLLOW YOKE KEY INSTALLATION STEPS

If the yoke key (1-40) is installed incorrectly the housing may be damaged when next

disassembly occurs. Refer to assembly drawing for correct yoke key spring and yoke key
orientation.

3.3.7 Hold the yoke key (1-40) down with your thumb; insert the torque shaft (1-30) by
gently rotating it into the housing (1-10) and yoke (1-20) on the opposite side of
the installed torque shaft wiper seal (2-20).

NOTE:

Torque Shaft should be installed with key rotated 180 degrees opposite yoke key slot.

When the torque shaft (1-30) is ush with the housing (1-10) push the torque shaft (1-30)
through until the empty seal groove is exposed. Install the other torque shaft wiper seal

(2-20) into the groove.

The cup of the torque shaft wiper seal again needs to be installed facing inward into the
housing.

Two new retaining rings (1-60) are contained in the Bettis CBA Service Kits.

3.3.8 Install one of the new retaining rings (1-60) onto the exposed end of the torque
shaft, making certain it is properly seated in the groove of the torque shaft (1-30).
Gently push and rotate the torque shaft (1-30) until the retaining ring (1-60) is
pressed against the housing (1-10). Install the other retaining ring (1-60) to the
other side of the torque shaft (1-30).

15

CAUTION: CHECK YOKE KEY ALIGNMENT

Rotate the torque shaft until the yoke key snaps into the yoke keyway.

Actuator Reassembly

Service Instructions

137464E Rev. E

3.3.9 Rotate the torque shaft (1-30) so that the arms of yoke (1-20) point out the open

3.3.10 Coat O-ring seal (5-20) with lubricant and install in the internal seal groove of the

3.3.11 Coat the following areas of piston (4-50) with lubricant: The outer diameter seal

3.3.12 Coat O-ring seal (5-20) with lubricant and install in the internal seal groove in the

3.3.13 Coat piston seal (5-40) with lubricant and install into outer diameter seal groove of

3.3.14 Coat entire length of center bar (8-10) with lubricant, including the threads.

3.3.15 Install piston (4-50) onto center bar (8-10).

3.3.16 Install bushing (4-80) between the two arms of yoke (1-20).

3.3.17 With the piston head facing away from housing (1-10) and with yoke pin up,

3.3.18 Install hex nut (8-20) onto one end of center bar (8-10) that is protruding through

3.3.19 Carefully slide piston (4-50) along center bar (8-10) until yoke pin engages the two

Section 3: Actuator Reassembly

May 2012

end of housing (1-10).

center bar “hole” located in housing (1-10).

groove, inner diameter seal groove, head of piston and exposed ends of yoke pin.

head of piston (4-50).

piston (4-50). The piston seal will t very loosely in the outer diameter seal groove.

install center bar (8-10) in the open end of housing (1-10) and push the center bar
through the center bar “hole” of housing (1-10).

the center bar “hole” of housing (1-10).

slots in the arms of yoke (1-20).

NOTE:

While holding the center bar ush against the housing, push piston (4-50) into housing
(1-10) as far as the piston will go. Check to see that bushing (4-80) is positioned between
the yoke (1-20) and the stem of piston (4-50).

3.3.20 Coat one o-ring seal (5-10) with lubricant and install onto outer diameter ange
located on housing adapter end of housing (1-10).

3.3.21 Actuators equipped with cylinder adapter (4-15), models CBA520 and 725, do
steps 3.3.21.1 and 3.3.21.2.

3.3.21.1 Install cylinder adapter (4-15) onto the ange of housing (1-10) and over

O-ring seal (5-10), with the stepped outer diameter, of cylinder adapter
(4-15), facing away from housing (1-10).

3.3.21.2 Install one o-seal (5-10) onto stepped diameter of cylinder adapter (4-15).

3.3.22 Apply a coating of lubricant to entire bore of cylinder (4-10).

3.3.23 Pneumatic cylinder installation:

3.3.23.1 For CBA520 and 725 models install the lubricated cylinder (4-10) over

the piston and up-against the o-ring seal on the stepped diameter ange

of cylinder adapter (4-15).

3.3.23.2 For CBA315, 420 and 525 models install the lubricated cylinder (4-10) over

the piston and up-against the o-ring seal on the ange of housing (1-10).

3.3.24 Coat O-ring seal (5-20) with lubricant and install into internal diameter seal groove
of the end cap (4-20).

3.3.25 M3 JACKSCREW (1-70) END CAP INSTALLATION FOR CBA315/415-M3 MODEL
ACTUATORS (includes –M3HW models).

Actuator Reassembly

16

Section 3: Actuator Reassembly

May 2012

3.3.25.1 Apply a light coating of lubricant to the threads of M3 jackscrew (1-70).

NOTE:

The M3 jackscrew will be installed from the cylinder side of end cap (4-20).

3.3.25.2 Install and rotate M3 jackscrew (1-70) into end cap (4-20).

NOTE:

Rotate the M3 jackscrew into the end cap (4-20) until the inboard end of the M3 jackscrew
is up against the end cap (4-20).

3.3.25.3 Install Thread seal (2-30) onto M3 jackscrew (1-70).

NOTE:

Move the O-ring seal (2-30) down the M3 jackscrew until it is next to the end cap (4-20).

Service Instructions

137464E Rev. E

3.3.25.4 Install hex nut (1-80) onto M3 jackscrew (1-70).

NOTE:

Rotate the hex nut down the M3 jackscrew until it is next to the end cap (4-20).

3.3.25.5 Continue reassembly at step 3.3.27.

3.3.26 M3 JACKSCREW END CAP (4-20) INSTALLATION FOR CBA420-M3 THRU
CBA725-M3 MODEL ACTUATORS (includes –M3HW models).

3.3.26.1 Apply a coating of lubricant to outer diameter and inner diameter threads

of M3 adapter (4-55).

3.3.26.2 Coat o-ring seal (5-45) with lubricant and install into outer diameter seal

groove located in the M3 adapter (4-55).

3.3.26.3 Apply a light coating of lubricant to the threads of M3 jackscrew (1-70).

3.3.26.4 Install and rotate M3 jackscrew (1-70) into M3 adapter (4-55).

NOTE:

Rotate the M3 jackscrew into the M3 adapter (4-55) until the inboard end of the M3
jackscrew is up against the M3 adapter (4-55).

The M3 adapter will be installed from the cylinder side of end cap (4-20).

17

3.3.26.5 Install M3 adapter (4-55) into end cap (4-20).

3.3.26.6 Install retainer ring (5-60) into outboard groove located on outer

diameter of M3 adapter (4-55).

3.3.26.7 Install thread seal (5-30) onto M3 jackscrew (1-70).

Actuator Reassembly

Service Instructions

137464E Rev. E

NOTE:

Move the thread seal (5-30) down the M3 jackscrew until it is next to the M3 adapter (4-55).

NOTE:

Rotate the hex nut down the M3 jackscrew until it is next to the M3 adapter (4-55).

3.3.27 End cap outer diameter seal installation.

NOTE:

Position the end cap (4-20) so that the inlet port is at the bottom and the M3 jackscrew
(1-70) is at the top of the actuator.

Section 3: Actuator Reassembly

May 2012

3.3.26.8 Install hex nut (4-40) onto M3 jackscrew (1-70).

3.3.27.1 Install O-ring seal (5-15) onto the outer diameter of end cap (4-20).

3.3.28 Install end cap (4-20) onto center bar (8-10) and cylinder (4-10).

WARNING: FOLLOW STEPS CORRECTLY

If step 3.3.29 is not completed as described the center bar O-ring seals (5-20) may become
a source of pressure leakage and cause the actuator to fail.

3.3.29 Install the second hex nut (8-20) onto the cylinder end of center bar (8-10). Adjust

the two hex nuts (8-20) such that the approximate same number of threads is
exposed on the ends of the center bar (8-10).

WARNING: DO NOT ALLOW END CAP TO ROTATE

Do not allow end cap (4-20) to rotate during center bar tightening. The end cap must
maintain the position as described in step 3.3.27. M3 jackscrew must be installed to be in
alignment with the target located on the piston assembly (4-50).

Actuator Reassembly

18

Section 3: Actuator Reassembly

May 2012

3.3.30 Tighten center bar hex nuts (8-20) to the proper torque as specied in the
following chart.

Table 4� Tightning Torque Center Bar

Service Instructions

137464E Rev. E

CBA actuator

Model

315 55 75
420 AND 520 100 136
525 AND 725 130 176

FT� LBS� N-m

Maximum torque

3.3.31 Adjust both M3 jackscrews (1-70) back to setting recorded in Section 2 step 2.1.2

under General Disassembly. Tighten both M3 jackscrew hex nuts (4-40) and (1-80)

securely, while holding M3 jackscrews (1-70).

3.3.32 M3 hex drive hub or hand wheel installation as follows:

3.3.32.1 Install hex drive hub (12-10) or hand wheel (12-10) onto M3 jackscrew
(1-70) and align the “hole” of the drive hub with the “hole” located in the
outboard end of M3 jackscrew (1-70).

3.3.32.2 Install retainer ring (12-30) and groove pin (12-20) into the hex drive hub
(12-10) or hand wheel (12-10).

19

Actuator Reassembly

Service Instructions

137464E Rev. E

Section 4: Actuator Testing

4�1 Actuator Testing

4.1.1 Leak Test - General - A small amount of leakage may be tolerated. Generally, a
small bubble which breaks about three seconds after starting to form is considered
acceptable.

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

WARNING: FOLLOW SERIAL TAG INFORMATION

Pressure is not to exceed the maximum operating pressure rating listed on the serial

number tag (20).

4.1.3 All leak testing will use the customer normal operating pressure or the actuator
name tag normal operating pressure (NOP).

Section 4: Actuator Testing

May 2012

NOTE:

When testing the actuator use a proper adjusted regulator to apply pressure to the
actuator.

4.1.4 Before testing for leaks, apply and release the pressure listed in step 4.1.3 to both

sides of the piston. Repeat this cycle approximately ve times. This will allow the

new seals to seek their service condition.

4.1.5 Apply the pressure listed in step 4.1.3 to the housing side of the piston and allow
the actuator to stabilize.

4.1.6 Apply a leak testing solution to the following areas:

4.1.6.1 Cylinder to housing joint on CBA315, 420, and 525 or cylinder to cylinder

adapter to housing joints on CBA520 and 725 actuators.

4.1.6.2 On the outboard end of housing (1-10) at the center bar hex nut. Check

the center bar to housing O-ring seal (5-20).

4.1.6.3 Housing stop screw / ES / M3 jackscrew O-ring seal (2-30).

4.1.6.4 Torque shaft (1-30) to housing (1-10) interface. Check rod wiper seals

(2-20).

4.1.6.5 End cap (4-20) port “hole”. Checks the piston to cylinder seal (5-40) and

piston to center bar seal (5-20).

4.1.6.6 Remove pressure from pressure inlet port in the housing (1-10).

Actuator Testing

20

Section 4: Actuator Testing

May 2012

4.1.7 Apply the pressure listed in step 4.1.3 to the end cap inlet port and allow the
actuator to stabilize.

4.1.8 Apply a leak testing solution to the following areas:

4.1.8.1 Cylinder to end cap joint. Check O-ring seal (5-15).

4.1.8.2 Housing (4-10) inlet port hole. Checks the piston to cylinder seal (5-40)

4.1.8.3 End cap stop screw or M3 jackscrew O-ring seal.

4.1.8.4 Remove pressure from pressure inlet port in the end cap (4-20).

4.1.9 If an actuator was disassembled and repaired as a result of this procedure, the
above leakage test must be performed again.

4.1.10 After the actuator is installed back on the valve all accessories should be hooked
up and tested for proper operation and replaced, if found defective.

Service Instructions

137464E Rev. E

and piston to center bar seal (5-20).

21

Actuator Testing

Service Instructions

137464E Rev. E

Section 5: Document Revision

Table 5� Revision Overview

ECN DATE REV BY * DATE

18743 Aug 2005 B COMPILED D.Blahnik 6/30/09
19527 April 2007 C CHECKED B.Jumawan 6/30/09

40677 6/30/09 D APPROVED K.Chin 6/30/09

COMPILED C. Rico 5/14/12

0526 001 May 2012 E

* Signatures on le Bettis Actuator & Controls, Waller, Texas

CHECKED A. Cruz 5/18/12

APPROVED K. Chin

Section 5: Document Revision

May 2012

Document Revision

22

Appendix

May 2012

Appendix A: List of Tables

Table 1 CBA Model Numbers ............................................................................................. 1

Table 2 Actuator Weight .................................................................................................... 4

Table 3 Tightning Torque Center Bar ................................................................................12

Table 4 Tightning Torque Center Bar ................................................................................17

Table 5 Revision Overview ............................................................................................... 20

Service Instructions

137464E Rev. E

23

Appendix

Service Instructions

137464E Rev. E

Appendix

May 2012

Appendix B: List of Drawings

B�1 Part No� 129738, CBAXXX Assembly Drawing

Appendix

24

Appendix

May 2012

B�2 Part No� 129740, CBAXXX-M3HW

Assembly Drawing

Service Instructions

137464E Rev. E

25

Appendix

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