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Table of Contents

Copyright Table of Contents About this Document How to Get Help Removal Procedures 7 - Rear Hull Ring Replacement Procedures 1 - Rear Hull Ring

About this Document

Document Conventions

Several symbols are used throughout this documentation to add emphasis and to assist in relocating important information. The following table describes these symbols and their uses.

SYMBOL	DESCRIPTION
	The Danger icon is used to indicate there is a potential risk of personal injury or death. Extra care should be taken to understand the risks, and all personnel should exercise caution. It may also be appropriate to warn others in the immediate vicinity.
	The Caution icon is used to indicate there is a potential risk of damage to the equipment or surrounding property. Personnel should receive training in the appropriate procedures before attempting to operate or maintain the equipment.
	The Do Not icon is used to indicate that an action or activity should NOT be performed.
	The Note icon is used to highlight a specific detail or point of information.
	The Tip icon is used to highlight a suggestion or recommendation.

Beyond this Document

There is no substitute for experience and/or training, especially with respect to the real purpose for which you plan to use this equipment. We encourage you to explore options beyond the scope of these materials to expand your knowledge and skills necessary to support your applications. In addition to this documentation, VideoRay offers training and technical support and hosts a general user discussion forum and user image gallery.

We also realize that collectively, users of our products spend considerably more time operating our systems than we do ourselves. Users also encounter more diverse operating environments across an extremely broad range of applications. We highly value this vast experience base, and invite and encourage you to share your experiences and suggestions with us. Please feel free to contact us by any of the methods listed below.

Quality Commitment

VideoRay strives to design, manufacture, deliver and support the highest quality products and services, including this documentation. We have made every effort to ensure that this documentation is accurate and provides you with the most up-to-date information.

If you find any errors in this documentation or have suggestions for improvements, each page contains a "Help us improve this document" feedback link in the left margin (you must be connected to the Internet to use this link).

Address
VideoRay LLC 212 East High Street Pottstown, PA 19464 USA
Email
info@videoray.com	General Information and Sales
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Telephone
+1 610-458-3000	Office
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This document is deemed accurate at the time of its writing, however it is not a legal contract and the information contained herein should not be construed to represent any form of commitment. This document as well as the associated products and services are subject to change without notice.

Online Manual

The full version of this manual is available online in the following formats:

• http://download.videoray.com/documentation/_MHU-003-GY-KIT_index for viewing the HMTL online.

• http://download.videoray.com/documentation/mnt/pdf/videoray_doc__MHU-003-GY-KIT_index.pdf for viewing the PDF online.

• http://download.videoray.com/documentation/mnt/zip/videoray_doc__MHU-003-GY-KIT_index.exe for downloading the HTML and PDF files.

How to Get Help

Help for your Pro 4 is available through several channels.

All Hours Self-Service / Crowd-Source Tools

Operator's Manuals and Standard Operating Procedures	www.videoray.com/support/manuals.html
Software Downloads	www.videoray.com/support/downloads.html
Frequently Asked Questions	www.rovfaq.com
ROV User Forum	www.rovinfo.com

Global Support

Email	support@videoray.com
Phone	+1 610-458-3000 (select option 1)
Skype	videoray.support (by appointment )
Remote Sessions	www.videoray.com/support/remote-support.html (by appointment )

Regional Support

VideoRay Authorized Service Centers and Dealers

www.videoray.com/dealer.html

Training

Operator Training	www.videoray.com/learn-more/training.html
Advanced Maintenance Training	www.videoray.com/learn-more/advanced-maintenance-courses.html

Operational Strategies and Tactics Support

If you need help understanding how to apply your system to a specific project, contact VideoRay or you local VideoRay dealer. We can provide guidance or help you find a certified consultant.

Rear Hull Ring Assembly Removal Overview

Skill level recommended: Intermediate

Total time required: Approximately 26 Minutes

Tools required:

• #2 Phillips Head Screw Driver
• 7/16 Inch Open End or Socket Wrench
• 5/16 Inch Open End Wrench or Nut Driver
• 5/16 Inch Open End Wrench or Nut Driver (Additional)
• Wooden Dowel Rod 3/8" x 12"

The following components must be removed:

• Float Block Kit
• Skid Kit
• Horizontal Thruster Propeller Kit (Left and Right)
• Horizontal Thruster Nozzle Kit
• Dome Retaining Rings and Main Hull Rods
• Rear Dome
• Rear Hull Ring Assembly

See the corresponding sections of this manual for instructions for parts other than the Rear Hull Ring Assembly.

Rear Hull Ring Assembly Removal Procedures

Time required for this step: Approximately 4 Minutes

Tools required for this step:

• None

Parts involved in this step:

MHU-003-GY-KIT Rear Hull Ring Assembly

Quantity	Part Number	Part Description
1	MHU-003-GY-KIT	Main Hull Assembly Port Ring (Pro 4)
1	OR-154	O-Ring #154

Steps

1. Using you index finger under the inside top of the rear hull ring and your thumb against the accessory port connector, gently pry the rear hull ring from the main hull. If the rear dome ring binds while pulling the top, you may need to pull the bottom to even it up for easier removal.

2. If you plan to replace the O-ring, remove it by pinching it around the rear hull ring to create a slack section that can be grabbed. Do NOT use a metal tool to remove the O-ring.

Rear Hull Ring Assembly Replacement Overview

Skill level recommended: Intermediate

Total time required: Approximately 26 Minutes

Tools required:

• O-Ring Lubricator
• 5/16 Inch Open End Wrench or Nut Driver
• 5/16 Inch Open End Wrench or Nut Driver (Additional)
• Torque Wrench
• Red Loctite or equivalent
• 7/16 Inch Open End or Socket Wrench
• #2 Phillips Head Screw Driver

The following components must be replaced:

• Rear Hull Ring Assembly
• Rear Dome
• Dome Retaining Rings and Main Hull Rods
• Horizontal Thruster Nozzle Kit
• Horizontal Thruster Propeller Kit (Left and Right)
• Skid Kit
• Float Block Kit

See the corresponding sections of this manual for instructions for parts other than the Rear Hull Ring Assembly.

Rear Hull Ring Assembly Replacement Procedures

Time required for this step: Approximately 3 Minutes

Tools required for this step:

• O-Ring Lubricator

Parts involved in this step:

MHU-003-GY-KIT Rear Hull Ring Assembly

Quantity	Part Number	Part Description
1	MHU-003-GY-KIT	Main Hull Assembly Port Ring (Pro 4)
1	OR-154	O-Ring #154

Steps

1. Use a new lubricated O-ring, or remove and lubricate the existing O-ring, and install it in the larger diameter O-ring groove of the rear hull ring.

2. Orient the rear hull ring so that the receiver bracket is facing toward the ROV and at the bottom of the main hull.

3. Position the rear hull ring at the rear of the main hull and make sure the rear of the heat sink engages in the receiver bracket at the bottom of the rear hull ring.

4. Being careful not to pinch the O-ring, press the rear hull ring into the main hull until is seats against the main hull. Make sure that you press the front ring evenly so that it does not bind.