Bettis Manual: Service Instructions Disassembly and Reassembly For Models HD521-S and HD721-S Double Acting Series Hydraulic Actuators | Bettis Manuals & Guides

Service Instructions

September 2014

GH Bettis Disassembly and Reassembly

For Models HD521-S and HD721-S Double-Acting Series
Hydraulic Actuators

074979 Rev. B

Service Instructions

074979 Rev. B

Table of Contents

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

Section 2: Support Items and Tools ���������������������������������������3

Section 3: Reference GH Bettis Materials �������������������������������4

Section 4: General Details �����������������������������������������������������5

Section 5: General Disassembly ���������������������������������������������6

Section 6: Rod Cover Disassembly �����������������������������������������7

Table of Contents

September 2014

Section 7: Power Cylinder Removal ���������������������������������������8

Section 8: Housing Group Disassembly ���������������������������������9

Section 9: General Reassembly ��������������������������������������������10

Section 10: Housing Reassembly ����������������������������������������� 11

Section 11: Power Cylinder Reassembly ������������������������������12

Section 12: Rod Cover Reassembly ��������������������������������������14

Section 13: Actuator Testing �����������������������������������������������15

Section 14: Return to Service ����������������������������������������������16

Section 15: Document Revision �������������������������������������������17

Appendix A: List of Drawings �����������������������������������������������18

ITable of Contents

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 HD521-S, HD521 M3-S, HD521 M3HW-S, HD721-S,
HD721 M3-S and HD721 M3HW-S hydraulic actuators.

2. SAFETY STATEMENT: Products supplied by GH 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 GH 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

074979 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).

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Introduction

Service Instructions

074979 Rev. B

4. BASIC SERVICE INFORMATION: COMPLETE ACTUATOR REFURBISHMENT REQUIRES

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

September 2014

THE 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

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Section 2: Support Items and Tools

September 2014

Section 2: Support Items and Tools

2�1 Support Items

Service/Seal Kit, razor-sharp cutting instrument, commercial leak testing solution, and
non-hardening thread sealant.

2�2 Tools

All tools are American Standard inch. 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-pounds).
Refer to Table 1 for recommended tool styles and size.

Service Instructions

074979 Rev. B

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Support Items and Tools

Service Instructions

074979 Rev. B

Section 3: Reference GH Bettis Materials

September 2014

Section 3: Reference GH Bettis Materials

Assembly Drawing 036251 for pneumatic actuators (see Appendix section).
This drawing is not for hydraulic service and will not show some items that is in the
hydraulic series actuators. It is a "good go by" assembly drawing only.

Reference GH Bettis Materials

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