GTD Series Actuators
Service Instructions
133893 Rev. C
January 2013
Service Instructions
133893 Rev. C
Table of Contents
Section 1: Introduction
1.1 General Service Information ......................................................................... 1
1.2 Denitions .................................................................................................... 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 Fluid Requirements ....................................................................................... 3
1.8 General Tool Information ............................................................................... 3
Section 2: Actuator Disassembly
2.1 General Disassembly ..................................................................................... 4
2.2 GTD Gas Cylinder Disassembly ....................................................................... 4
2.3 GTO Oil Cylinder Disassembly ........................................................................ 5
2.4 Drive Module Disassembly ............................................................................. 6
Table of Contents
January 2013
Section 3: Actuator Reassembly
3.1 General Reassembly ...................................................................................... 9
3.2 Drive Module Reassembly .............................................................................. 9
3.3 GTD Gas Cylinder Reassembly ...................................................................... 12
3.4 GTO Oil Cylinder Reassembly ....................................................................... 16
3.5 Actuator Testing .......................................................................................... 18
Section 4: Module Removal and Installation
4.1 GTO Oil Cylinder Removal ............................................................................ 19
4.2 GTO Oil Cylinder Installation ........................................................................ 20
Section 5: Actuator Support Information
5.1 Weights By Item Number And Actuator Housing Size .................................. 22
5.2 GTD01 Tool Style And Wrench Size .............................................................. 23
5.3 GTD2 Tool Style and Wrench Size ................................................................ 24
5.4 GTD3 Tool Style and Wrench Size ................................................................ 25
5.5 GTD4 Tool Style And Wrench Size ................................................................ 26
5.6 GTD5 Tool Style And Wrench Size ................................................................ 27
5.7 GTD7 Tool Style and Wrench Size ................................................................ 28
Section 6: Document Revision ��������������������������������������������29
Table of Contents
Appendix A: List of Tables ���������������������������������������������������30
Appendix B: List of Drawings ����������������������������������������������31
I
Section 1: Introduction
January 2013
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 GTD01X0X, GTD2X0X, GTD3X0X, GTD4X0X, GTD5X0X,
and GTD7X0X Double Acting Series Actuators. These actuators will have one
single GTD gas cylinder (Gas) utilizing tie bar construction and one single GTO oil
cylinder (Hydraulic) utilizing tie bar construction.
1.1.2 Normal recommended service interval for this actuator series is ve years to
maximum total life cycle.
NOTE:
Storage time is counted as part of the service interval.
Service Instructions
133893 Rev. C
1.1.3 This procedure is applicable with the understanding that all electrical power and
gas pressure has been removed from the actuator.
1.1.4 Remove all piping and mounted accessories that will interfere with the actuator
assemblies(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 This procedure is written using the stop screw plug side of the housing (1-10)
as a reference and this side will be considered the front side of the actuator. The
housing cover (1-20) will be the top of the actuator.
1.1.8 Actuator Cylinder/Module weights are listed in Section 5 Table 5.1.
1.1.9 When removing seals from seal grooves, use a commercial seal removing tool or a
small screwdriver with sharp corners rounded off.
1.1.10 Use a non-hardening thread sealant on all pipe threads.
CAUTION: FOLLOW MANUFACTURER'S INSTRUCTIONS
Apply the thread sealant per the manufacture’s instructions.
1.1.11 Bettis recommends that disassembly of the actuator should be done in a clean
area on a work bench.
1
Introduction
Service Instructions
133893 Rev. C
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
January 2013
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).
1�3 General Safety Information
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 welltrained, equipped, prepared and competent personnel.
WARNING: READ WARNING MESSAGES CAREFULLY
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.
WARNING: FOLLOW PLANT SAFETY PROCEDURES
This procedure should not supersede or replace any customers plant safety or work
procedures. If a conict arises between this procedure and the customers procedures
the differences should be resolved in writing between an authorized customers
representative and a authorized Bettis representative.
Introduction
2
Section 1: Introduction
January 2013
1�4 Bettis Reference Materials
1.4.1 Assembly Drawing for GTD01 through GTD7 Series Actuators use part number
133202.
1�5 Service Support Items
1.5.1 Bettis Service Kits.
1.5.2 Non-hardening thread sealant.
1�6 Lubrication Requirements
1.6.1 Bettis ESL-4, 5 & 10 lubricant. This lubricant is to be used in the Drive Module and
GTD Gas Cylinder.
NOTE:
Bettis ESL-4, 5 & 10 lubricant tube(s) are contained in the Bettis Service Kits.
Service Instructions
133893 Rev. C
1.6.2 Lubricants, other than listed in step 1.6.1, should not be used without prior written
approval of Bettis Product Engineering.
1�7 Fluid Requirements
1.7.1 For use in the GTO Oil Cylinder use Dexron Automatic Transmission Fluid, or as
specied.
1.7.2 This uid is the recommended uid only and does not limit the use of other
hydraulic uids compatible with supplied seals and coatings.
1�8 General Tool Information
1.8.1 Tools: All tools are American Standard inch. Large adjustable wrench, two (2) large
screwdrivers, Allen wrench set, set of open/box-end wrenches, rubber or leather
mallet, torque wrench (up to 5,000 inch pounds), breaker bar, and a 1/2" drive
socket set. For recommended tool and wrench sizes refer to Section 5 Tables 5.2
through 5.7
3
Introduction
Service Instructions
133893 Rev. C
Section 2: Actuator Disassembly
2�1 General Disassembly
WARNING: CHECK FOR DANGEROUS GAS AND LIQUIDS
It is very possible, that the actuator may contain a dangerous gas such as (Sour gas/H2S,
Oxygen, Nitrogen, etc.) and/or liquids such as (Condense, Descalers, Petroleum bases,
etc.). Ensure that all proper measures have been taken to prevent dangerous exposure or
release of these types of residues before commencing any work.
2.1.1 Section 2 - Actuator Disassembly is written to either completely disassemble the
entire actuator or can be used to disassemble individual actuator assemblies as
needed (i.e., GTD Gas Cylinder, Drive Module or GTO Oil Cylinder).
2.1.2 The GTD gas cylinder is to be disassembled while still attached to the Drive
Module.
2.1.3 The GTO oil cylinder can be disassembled while still attached to the Drive Module
or it can be removed from the Drive Module and disassembled separate to the
actuator (refer to Section 5 – Module, Cylinder Removal And Installation).
Section 2: Actuator Disassembly
January 2013
CAUTION: CONTAIN HYDRAULIC FLUID
Using some means to contain hydraulic uid as the tubing (piping) is disconnect
from the GTO outer end cap (7-80) and inner end cap (7-10).
2.1.4 Disconnect all hydraulic uid lines to GTO oil cylinder outer end cap (7-80) and
inner end cap (7-10). Drain as much of the hydraulic uid as possible.
2.1.5 To ensure correct re-assembly; that is, with GTO oil cylinder or GTD gas cylinder
on same end of Drive Module as was, mark or tag right (or left) and mark mating
surfaces.
2�2 GTD Gas Cylinder Disassembly
NOTE:
Review Section 2 notes and steps 2.1.1 through 2.1.5 General Disassembly before
proceeding with GTD gas cylinder disassembly.
WARNING: DISCONNECT HYDRAULIC PRESSURE
If not already removed disconnect all operating pressure from actuator GTD gas cylinder.
2.2.1 Mark and record location of the ports on outer end cap (3-80) and
inner end cap (3-10).
2.2.2 The setting of stop screw (3-180) should be checked and setting recorded before
loosened or removed.
Actuator Disassembly
4
Section 2: Actuator Disassembly
January 2013
NOTE:
The stop screw will be removed later in this procedure.
2.2.3 Remove the jam nut (3-190) and o-ring seal (4-100) from stop screw (3-180).
2.2.4 Remove hex nuts (3-90), with lockwashers (3-95), from tie bars (3-20).
2.2.5 Remove outer end cap (3-80) from cylinder (3-70). and tie bars (3-20).
2.2.6 Remove stop screw assembly (3-180) from the inboard side of outer end cap (3-80).
2.2.7 Unscrew and remove tie bars (3-20) from inner end cap (3-10).
2.2.8 Remove cylinder (3-70) from piston (3-30) and inner end cap (3-10).
2.2.9 Refer to assembly drawing page 2 of 2 Detail "C". Remove two split ring halves (3-
50) and one retainer ring (3-60) from outboard end of piston rod assembly (3-40).
2.2.10 Remove the piston (3-30) from piston rod assembly (3-40).
2.2.11 On model GTD4008.0 remove the end cap/cylinder adapter (3-260) from inner
end cap (3-10).
2.2.12 Remove o-ring seal (4-70) from piston rod assembly (3-40).
2.2.13 Remove the remaining two split ring halves (3-50) and one retainer ring (3-60)
from piston rod assembly (3-40).
2.2.14 Remove socket cap screws (3-115) with lockwashers (3-110) from
inner end cap (3-10).
2.2.15 Refer to assembly drawing page 2 of 2 Detail "B". Remove hex nuts (3-105) from
socket cap screws (3-100).
2.2.16 Remove socket cap screws (3-100) with lockwashers (3-110) from
inner end cap (3-10).
2.2.17 Remove inner end cap (3-10) off of piston rod assembly (3-40).
2.2.18 Unscrew and remove piston rod assembly (3-40) from drive module.
2.2.19 It is not necessary to remove pipe plugs (3-210) from inner end cap (3-10) and
outer end cap (3-80) for normal or routine actuator service.
Service Instructions
133893 Rev. C
2�3 GTO Oil Cylinder Disassembly
NOTE:
Review Section 2 notes and steps 2.1.1 through 2.1.4 General Disassembly before
proceeding with GTO oil cylinder disassembly.
The GTO oil cylinder can either be disassembled piece by piece or removed per
Section 4.1 and disassembled on a work bench per the following steps.
2.3.1 Mark and record location of the ports on outer end cap (7-80) and
inner end cap (7-10).
2.3.2 The setting of stop screw (7-180) should be checked and setting recorded before
loosened or removed.
NOTE:
The stop screw will be removed later in this procedure.
5
Actuator Disassembly
Service Instructions
133893 Rev. C
2.3.3 Remove the jam nut (7-190) from stop screw (7-180).
2.3.4 Remove stop screw (7-180) from outer end cap (7-80).
2.3.5 Remove hex nuts (7-90), with lockwashers (7-95), from tie bars (7-20).
2.3.6 Remove outer end cap (7-80) from cylinder (7-70) and tie bars (7-20).
2.3.7 Unscrew and remove tie bars (7-20) from inner end cap (7-10).
2.3.8 Remove the cylinder (7-70) from piston (7-30) and inner end cap (7-10).
2.3.9 Refer to assembly drawing page 2 of 2 Detail "E". Remove two split ring halves (7-
2.3.10 Remove the piston (7-30) from piston rod assembly (7-40).
2.3.11 Remove the o-ring seal (8-70) from piston rod assembly (7-40).
2.3.12 Remove the remaining two split ring halves (7-50) and one retainer ring (7-60)
2.3.13 Remove socket cap screws (7-115) with lockwashers (7-110) from
2.3.14 Refer to assembly drawing page 2 of 2 Detail "D". Remove hex nuts (7-105) from
2.3.15 Remove socket cap screws (7-100) with lockwashers (7-110) from
2.3.16 Remove inner end cap (7-10) off of piston rod assembly (7-40).
2.3.17 Unscrew and remove piston rod assembly (7-40) from drive module.
2.3.18 It is not necessary to remove pipe plugs (7-210) from inner end cap (7-10) and
Section 2: Actuator Disassembly
January 2013
50) and one retainer ring (7-60) from outboard end of piston rod assembly (7-40).
from piston rod assembly (7-40).
inner end cap (7-10).
socket cap screws (7-100).
inner end cap (7-10).
outer end cap (7-80) for normal or routine actuator service.
2�4 Drive Module Disassembly
NOTE:
Review Section 2 notes and steps 2.1.1 through 2.1.5 General Disassembly before proceeding with Drive Module Disassembly.
2.4.1 If not already removed remove piston rod assemblies (3-40) and (7-40) from drive
module (1-10).
NOTE:
For steps 2.4.2 through 2.4.9 refer to assembly drawing page 2 of 2 Section A-A and Detail “A”.
2.4.2 Before removing position indicator (1-220), record or mark it's position. Remove
position indicator (1-220).
NOTE:
Step 2.4.3 is used only on GTD01, GTD2 and GTD3 Drive Modules. Drive Modules GTD4
and GTD5 will skip steps 2.4.3 and continue with step 2.4.4.
Actuator Disassembly
6
Section 2: Actuator Disassembly
January 2013
2.4.3 Remove one vent check assembly (13) from top of housing cover (1-20).
2.4.4 Unscrew and remove hex cap screws (1-160) with lockwashers (1-170) from yoke
cover (1-150).
2.4.5 Remove yoke cover (1-150) from housing cover (1-20).
2.4.6 Mark and record the orientation of the position indicator assembly (1-140) in
relation to the top of yoke (1-70).
2.4.7 Remove position indicator assembly (1-140) from top of yoke (1-70).
2.4.8 Remove spring pin (1-100) from top of yoke (1-70).
2.4.9 Remove hex cap screws (1-110), with lockwashers (1-115) or with lockwashers
(1-170), from housing cover (1-20).
NOTE:
Steps 2.4.10 and 2.4.11 are used only on GTD7 drive module (refer to assembly drawing
note number ve). Drive modules GTD01, GTD2, GTD3, GTD4 and GTD5 will skip steps
2.4.10 and 2.4.11 and continue with step 2.4.12.
Service Instructions
133893 Rev. C
2.4.10 Remove hex cap screws (1-120), with lockwashers (1-115), from housing cover (1-20).
2.4.11 Using hex cap screws (1-110), install into holes vacated by hex cap screws (1-120).
Use these hex cap screws to jack the housing cover up for removal. Alternately
rotate the hex cap screw clockwise until housing cover (1-20) is clear of groove
pins (1-130).
NOTE:
GTD01, GTD2, GTD3 and GTD4 model housing cover (1-20) will have cast tabs for placing
prying tools to aid in cover removal.
2.4.12 Remove housing cover (1-20) from housing (1-10).
NOTE:
Groove pins (1-130) will remain in housing cover (1-20) when housing cover is removed
from housing (1-10). Groove pins (1-130) should not be removed from housing cover (1-
20) unless they are damaged and require new replacements.
2.4.13 Remove guide bar (1-90) from housing (1-10).
2.4.14 Rotate the arms of yoke (1-70) to the center position of housing (1-10).
2.4.15 Remove yoke (1-70) with yoke pin (1-80), guide block assembly (1-30) and two
yoke/guide block bushings (2-30) by lifting yoke up and out of the housing (1-10).
2.4.16 Remove yoke pin (1-80) by inserting 3/8"-16 UNC screw into top of the yoke pin
and pull straight up and out.
2.4.17 Remove the guide block assembly (1-30) from between the arms of yoke (1-70).
2.4.18 Remove the yoke/guide block bushing (2-30) from top of guide block assembly
(1-30).
2.4.19 Remove the yoke/guide block bushing (2-30) from the top of the lower yoke arm
of yoke (1-70).
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Actuator Disassembly
Service Instructions
133893 Rev. C
2.4.20 Unscrew and remove two stop screw plugs (1-180) from housing (1-10).
2.4.21 Housing (1-10) vent check assembly removal as follows:
2.4.22 The following items do not need to be removed from their assembled locations
Section 2: Actuator Disassembly
January 2013
2.4.21.1 GTD01, GTD2 and GTD3 housing (1-10) unscrew and remove one vent
check assembly (13) from the front of housing (1-10).
2.4.21.2 GTD4 through GTD7 housing (1-10) unscrew and remove two vent check
assemblies (13) from the front of housing (1-10).
unless being replaced by new items: Two yoke bearings (2-40), yoke pin bearing
and yoke pin thrust bearing (2-10).
Actuator Disassembly
8
Section 3: Actuator Reassembly
January 2013
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
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 and piston rod assembly must be free of deep scratches, pitting, corrosion
and blistering or aking coating.
Service Instructions
133893 Rev. C
CAUTION: CHECK PARTS FOR SIGNS OF WEAR
Actuator parts that reect any of the above listed characteristics should be replaced with
new parts.
3.1.4 Before installation coat all moving parts with a complete lm of lubricant. Coat all
seals with a complete lm of lubricant, before installing into seal grooves.
NOTE:
The parts and seals used in the actuator drive module and GTD gas cylinder will be assembled
using lubricant as identied in Section 1 step 1.6.1. The parts and seals used in the actuator
GTO oil cylinder will be assembled using lubricant as identied in Section 1 step 1.7.1.
3�2 Drive Module Reassembly
NOTE:
Review section 3.1 General Reassembly before proceeding with Drive Module Reassembly.
3.2.1 If the guide bar bearings are being replaced install new bearings into guide block
assembly (1-30).
NOTE:
The guide bar bearing must be press t into guide block guide bar bore with the seam
located ±5° degrees of the top or bottom centerline as shown in section A-A.
9
Actuator Reassembly
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