Emerson Double-Acting Series, HD732-S, HD732 M3HW-S, HD732 M3-S Disassembly And Reassembly
Service Instructions
074985 Rev. B
October 2014
Bettis Disassembly and Reassembly
For Models HD732-S Double-Acting Series Hydraulic Actuators
Service Instructions
074985 Rev. B
Table of Contents
Section 1: Introduction
Section 2: Support Items and Tools
2.1 Support Items ........................................................................................... 3
2.2 Tools ......................................................................................................... 3
Section 3: Bettis Reference Materials
Section 4: General
Section 5: General Disassembly
Table of Contents
October 2014
Section 6: Pressure Cylinder Disassembly
Section 7: Housing Group Disassembly
Section 8: General Reassembly
Section 9: Center Housing Group Reassembly
Section 10: Pressure Cylinder Reassembly
Section 11: Actuator Testing
Section 12: Return to Service
Section 13: M3 Jackscrew Disassembly
Section 14: M3 Jackscrew Reassembly
Section 15: Document Revision
Appendix A: List of Drawings
ITable of Contents
Section 1: Introduction
October 2014
Section 1: Introduction
1. This service procedure is offered as a guide to enable general maintenance to
be performed on Bettis, HD732-S, HD732 M3-S, and HD732 M3HW-S hydraulic
series actuators.
2. SAFETY STATEMENT: 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 a well-trained, equipped, prepared and
competent technician.
WARNING
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.
Service Instructions
074985 Rev. B
3. 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.
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
Service Instructions
074985 Rev. B
4. BASIC SERVICE INFORMATION: Complete actuator refurbishment requires the
5. The maximum recommended service interval for this actuator series is five
6. This procedure is applicable with the understanding that all electrical power and
Section 1: Introduction
October 2014
actuator be dismounted from the valve or device it is operating.
years. Storage time is counted as part of the service interval.
hydraulic pressure has been removed from the actuator. Also, it is understood
that the actuator has been removed from the valve, as well as all piping and
accessories that are mounted on the actuator have been removed.
Introduction
2
Section 2: Support Items and Tools
October 2014
Section 2: Support Items and Tools
2.1 Support Items
Service/Seal Kit, commercial leak testing solution, and non-hardening thread sealant.
2.2 Tools
All tools are American Standard inch. Two each medium standard screwdriver, small
standard screwdriver with corners rounded, putty knife, rubber or leather mallet and a
torque wrench (up to 2,000 inch-pounds). For recommended tool list, refer to Page 17.
Service Instructions
074985 Rev. B
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Support Items and Tools
Service Instructions
074985 Rev. B
Section 3: Bettis Reference Materials
Section 3: Bettis Reference Materials
1. Assembly Drawing Part Number 036278*.
2. Exploded Detail Drawing 063356* for HD732 actuators.
3. Exploded Detail Drawing 068112* for HD732 M3 and HD732 M3HW actuators.
* The drawings called out in the above Steps 1 through 3 are for pneumatic operated
actuators and will not call out the bleed valves (2-120) or the drain pipe plugs (2-130)
that are located in the cylinder adapters (2-30) or in the cylinders (3)/(3-10).
October 2014
Bettis Reference Materials
4
Section 4: General
October 2014
Section 4: General
1. This procedure should only be implemented by a technically competent
technician who should take care to observe good workmanship practices.
2. Numbers in parentheses( ), indicate the bubble number (reference number)
used on the GH-Bettis Assembly Drawing, Exploded Detail Drawing, and
actuator Part List.
3. 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 side of the actuator.
The housing cover (1-20) will be the top of the actuator.
4. Refer to Table 1 for approximate actuator weights.
5. To help in correct reassembly; that is, with power cylinder on same end of
housing as was, cylinder to cylinder adapter, cylinder adapter to housing, right
and left stop screws, and others, mark or tag for ease of reassembly, also mark
mating surfaces.
Service Instructions
074985 Rev. B
6. When removing seals from seal grooves, use a commercial seal removing tool
or use a small screwdriver with the sharp edges rounded off.
7. Use a non-hardening thread sealant on all pipe threads.
NOTE:
Apply the thread sealant per the manufacturer's instructions.
8. Disassembly of actuator should be done in a clean area on a work bench.
9. LUBRICATION REQUIREMENTS:
For use in housing (1-10) area of the actuator. Lubricants, other than those listed
in following steps A and B, should not be used without prior written approval of
Bettis Product Engineering.
a. Standard and high temperature service (-20°F to +350°F) use Bettis ESL
5 (Kronaplate 100). ESL 5 is contained in the Bettis Service/Seal Kit.
b. Low temperature service (-50°F to +150°F) use Kronaplate 50.
Kronaplate 50 is not contained in the Low Temperature Service/Seal Kit.
10. FLUID REQUIREMENTS:
For use in power cylinders (3) or (3-10). The following listed fluids are
recommended fluids only and does not limit the use of other hydraulic fluids
compatible with supplied seals and coatings.
a. Standard and high temperature service (-20°F to +350°F) use Dexron II
b. Low temperature service (-50°F to +150°F) use Exxon Univis J13 or HVI
5
or Shell Tellus T-32 Automatic Transmission Fluid.
13 Hydraulic Fluid.
General
Service Instructions
074985 Rev. B
Section 5: General Disassembly
Section 5: General Disassembly
1. If not already done, remove all operating pressure from actuator cylinder (3) or
cylinder assemblies M3 (3-10).
2. If the actuator is equipped with a M3 jackscrew, make sure that the jackscrew
(3-20) does not engage the piston rod (2-10).
3. Actuators equipped with M3HW jackscrew with handwheel option, remove hex
nut (8-30), lock washer (8-20), and handwheel (8-10).
4. Mark stop screws (1-60) left and right. Measure and record the exposed
length of the right and left stop screws (1-60). The stop screws will be
removed later in this procedure.
5. Identify each cylinder adapter (2-30) left or right and record the inlet port
locations in cylinder adapters (2-30).
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6. Removed the socket cap screws (1-120) from position indicator (1-110),
yoke weather cover (6-110), and remove position indicator/yoke weather cover.
7. Remove snubber (1-130) from the housing (1-10).
8. On cylinders (3) or (3-10) and cylinder adapters (2-30), open bleed valves (2-120).
CAUTION: USE PROPER WRENCH STYLE AND SIZE
The bleed valves are 1/8 NPT and are made out of brass. Use only the correct size
wrench. Refer to Table 2 at the end of this procedure for recommended wrench style
and correct wrench size. Do not use pliers or other style adjustable wrench for bleed
valve removal or adjustment.
9. Drain the hydraulic fluid from cylinders (3) or (3-10) and cylinders adapters
(2-30) by removing pipe plugs (2-130).
General Disassembly
6
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