Emerson Double-Acting Series Instrucciones de instalación

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

October 2014

ITable of Contents

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

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

Service Instructions

074985 Rev. B

October 2014

Section 1: Introduction

Introduction

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.

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).

Service Instructions

074985 Rev. B

October 2014

Section 1: Introduction

Introduction

4. BASIC SERVICE INFORMATION: Complete actuator refurbishment requires the

actuator be dismounted from the valve or device it is operating.

5. The maximum recommended service interval for this actuator series is five

years. Storage time is counted as part of the service interval.

6. This procedure is applicable with the understanding that all electrical power and

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.

Service Instructions

074985 Rev. B

October 2014

Section 2: Support Items and Tools

Support Items and Tools

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

October 2014

Section 3: Bettis Reference Materials

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).

Service Instructions

074985 Rev. B

October 2014

Section 4: General

General

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.

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

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.

Service Instructions

074985 Rev. B

October 2014

Section 5: General Disassembly

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).

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).

Service Instructions

074985 Rev. B

October 2014

Section 6: Pressure Cylinder Disassembly

Pressure Cylinder Disassembly

Section 6: Pressure Cylinder Disassembly

1. The following steps may be performed on one cylinder and then on the other

cylinder or simultaneously on both cylinders.

2. Secure the chain wrench around cylinder (3) or cylinder assembly M3

(3-10) as close to the welded end cap as possible. Using the mallet, break the

cylinder loose and then, remove the cylinder by rotating in a counterclockwise

direction. When setting the cylinder aside, care should be taken to protect the

chamfered edge and cylinder threads.

3. Unscrew and remove piston hex lock nut (2-70).

4. Remove piston (2-20) from piston rod (2-10).

5. Unscrew and remove four cylinder adapter ferry screws (2-90) and gasket seals

(6-80) from cylinder adapter (2-30).

6. Remove cylinder adapter (2-30), taking care not to scratch piston rod (2-10)

or disengage rod bushings (2-40).

7. It is not necessary to disassemble M3 Jackscrew (3-20) from cylinder assembly

M3 (3-10) unless it needs maintenance or when replacing nut seal (3-30).

For disassembly of the M3 or M3HW jackscrew, refer to Section 13,

"M3 Jackscrew Disassembly"

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