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Table of Contents

Copyright Table of Contents About this Document How to Get Help Removal Procedures 5 - Dome Retaining Rings Replacement Procedures 1 - Dome Retaining Rings

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.

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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
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Online Manual

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

• http://download.videoray.com/documentation/_MHU-002-GY-KIT_index for viewing the HMTL online.

• http://download.videoray.com/documentation/mnt/pdf/videoray_doc__MHU-002-GY-KIT_index.pdf for viewing the PDF online.

• http://download.videoray.com/documentation/mnt/zip/videoray_doc__MHU-002-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.

Dome Retaining Rings and Main Hull Rods Removal Overview

Skill level recommended: Intermediate

Total time required: Approximately 20 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)

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

See the corresponding sections of this manual for instructions for parts other than the Dome Retaining Rings and Main Hull Rods.

Dome Retaining Rings and Main Hull Rods Removal Procedures

Time required for this step: Approximately 5 Minutes

Tools required for this step:

• 5/16 Inch Open End Wrench or Nut Driver
• 5/16 Inch Open End Wrench or Nut Driver (Additional)

Parts involved in this step:

MHU-002-GY-KIT Dome Retaining Rings and Main Hull Rods

Quantity	Part Number	Part Description
2	MHU-002-GY	Main Hull Part Dome Retaining Ring (Pro 4)
2	MHU-005	Main Hull Part Rod
4	91855A271	Nut #6-32 x 5/16" Acorn SS
2	91831A007	Nut #6-32 x 5/16" Nylock
4	561-06012	Washer #6 Insulating Nylon

Steps

1. Unscrew the 6-32 acorn nuts from the main hull rods at the rear of the ROV.

2. Unscrew the 6-32 Nylock nuts from the main hull rods at the rear of the ROV.

3. Remove the rear dome retaining ring from the main hull rods. Make sure to keep track of the plastic inserts.

4. Remove the front dome retaining ring and main hull rods from the front of the main hull.

Dome Retaining Rings and Main Hull Rods Replacement Overview

Skill level recommended: Intermediate

Total time required: Approximately 20 Minutes

Tools required:

• 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:

• 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 Dome Retaining Rings and Main Hull Rods.

Dome Retaining Rings and Main Hull Rods Replacement Procedures

Time required for this step: Approximately 5 Minutes

Tools required for this step:

• 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

Parts involved in this step:

MHU-002-GY-KIT Dome Retaining Rings and Main Hull Rods

Quantity	Part Number	Part Description
2	MHU-002-GY	Main Hull Part Dome Retaining Ring (Pro 4)
2	MHU-005	Main Hull Part Rod
4	91855A271	Nut #6-32 x 5/16" Acorn SS
2	91831A007	Nut #6-32 x 5/16" Nylock
4	561-06012	Washer #6 Insulating Nylon

Steps

1. Makes sure the tabs on the front and rear domes are aligned horizontally so they do not interfere with the rods.

2. If the 6-32, 5/8 inch acorn nuts are installed on one end of the main hull rods, proceed to the next numbered step. Otherwise, follow these two lettered steps:

1. Place a plastic isolation insert, with the narrow end first, on each hull rod.

2. Apply red Loctite to the threads on the rod.

3. Replace an acorn nut on the end of each hull rod with the plastic isolation insert installed and tighten the nut.

3. If the hull rods are inserted in the front dome retaining ring, proceed to the next numbered step. Otherwise, follow this lettered step.

1. Insert the rods with plastic isolation inserts and acorn nuts through the diagonal holes in the front dome retaining ring until the isolation inserts are seated in the holes.

4. Orient the front dome retaining ring and rods assembly at the front of the ROV so that the ends of the rods without nuts are facing toward the rear of the ROV and the skid screw holes in the ring are oriented toward the bottom of the ROV.

5. Slide the front dome retaining ring and rods assembly in place over the main hull.

6. Press the front dome retaining ring onto the front dome until is seats against the rim at the base of the front dome.

7. Orient the rear dome retaining ring at the rear of the ROV and with its hole orientation matching the front dome retaining ring.

8. Position the rear dome retaining ring over the rear dome making sure the hull rods come through the corresponding holes in the ring.

9. Press the rear dome retaining ring onto the rear dome until is seats against the rim at the base of the dome.

10. Place the plastic isolation inserts, narrow end first, over the rear of the hull rods and press the inserts into the holes in the rear dome retaining ring.

11. Replace the Nylock nuts on the rear of the hull rods, but do not tighten the nuts all of the way.

12. Place the ROV on a flat surface and make sure that the bases of both dome retaining rings sit flat on the surface and that the ROV is level from side to side.

13. Tighten the Nylock nuts at the rear of the hull rods until they seat against the plastic isolation inserts. Torque the nuts to4 inch-pounds (0.45 Nm). Do NOT over tighten the Nylock nuts. Over tightening the Nylock nuts can bend the dome retaining rings or crack the domes.

14. Install the acorn nuts on the rear of the hull rods and snug them tight against the Nylock nuts.

Tip

The front and rear dome rings are identical and can be interchanged.