S.E.A.
SEA MK Technical Maintenance Manual Copyright Notice This manual is copyrighted, all rights reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated or reduced to any electronic medium or machine-readable format without prior consent in writing from Aqua Lung America International, Inc. ©2010 Aqua Lung America S.E.A. / MK TECHNICAL Manual, P/N 108348 You can contact a Technical Adviser via e-mail at: rbedard@aqualung.com grubin@aqualung.com jminton@aqualung.
CONTENTS Change Record.....................................................................................................................................4 Copyright Notice....................................................................................................................................5 General Guidelines................................................................................................................................5 General Conventions..................................
SEA MK Technical Maintenance Manual CHANGE RECORD Change No. Date Title or Description Change made by 001-11 10/6/11 P.
Introduction This manual provides factory prescribed procedures for the correct service and repair of the Aqua Lung SEA MK. It is not intended to be used as an instructional manual for untrained personnel. The procedures outlined within this manual are to be performed only by personnel who have received Factory Authorized training through an Aqua Lung Service & Repair Seminar.
SEA MK Technical Maintenance Manual Initial Inspection Procedure External Inspection 1. When possible, inspect the filter of the fill adapter for any signs that contaminants, such as moisture or particulate matter, may have entered the system. 2. Visually inspect the MP hose along its length for any signs of deterioration or damage, such as blistering, abrasion, or corrosion of the fittings. 3. Slowly pressurize the system by turning the on-off handwheel counterclockwise 4.
DISASSEMBLY PROCEDURE NOTE: Before performing any disassembly, refer 5. Unscrew and discard the burst plug (6) from the first stage (36) using a 3/8" socket. to the exploded parts drawing, which references all mandatory replacement parts. These parts should be replaced with new and must not be reused under any circumstances – regardless of the age of the regulator or how much use it has received since it was last serviced.
SEA MK Technical Maintenance Manual 10. Insert the squared end of the stem into the valve seat (20) and unscrew and discard the valve seat from the first stage body. b . Using a 1/8" hex key unscrew the retaining screw (27g) from the pin indicator body (27b). Remove the spring (27e) and pin (27f). 27b 27e 27b 27g 11. Using a magnifier, inspect the condition of the crown. There should be no scratches, nicks or dents on the crown sealing surface. 27g c .
17. Remove and discard the fill adapter port o-ring (22). 22. Using the bottle vice (pn 100397), vice insert (pn 100398) or strap wrench (pn 54325A22), hold the cylinder secure. While holding the cylinder secure, unscrew the first stage body (36) from the cylinder using a 1 3/16" crowfoot & flex handle drive. 18. Using your fingers, peel the cap protector (29) off the first stage. 23. Remove and discard the o-ring (37) from the cylinder threads. 19.
SEA MK Technical Maintenance Manual 3. Lift out the Ring Cover Support (42) and diaphragm (43). Inspect the diaphragm for any tears or pin holes by holding it up to a light and gently stretching around the perimeter. Discard the diaphragm or set it aside to be reused, depending on its condition. 4. While depressing the lever (45), unscrew the inlet fitting (52) using a 3/4" wrench. Remove and discard the inlet fitting o-ring (14). 7.
REASSEMBLY PROCEDURE 4. Place the spring (35) into the body. Press the piston into the cap (30) so that the piston head is seated flat against the cap. Verify there is no dirt or damage to the smooth inner sides of the cap. First Stage Reassembly CAUTION: Before proceeding, visually inspect the cylinder according to Compressed Gas Association (CGA) standards (pamphlet CGA C-6.1--1984, "STANDARDS FOR VISUAL INSPECTION OF HIGH PRESSURE ALUMINUM COMPRESSED GAS CYLINDERS".
SEA MK Technical Maintenance Manual 9. SEA MK with a pin-type pressure indicator (27a): a. Drop a new lubricated o-ring (27c) into the pin indicator body (27b), making sure it is properly seated in the small recess inside the body. Drop the washer (27d) over the oring, making sure it is laying flat atop the o-ring. b . Insert the spring (27e) into the indicator body and insert the pin (27f) into the spring.
14. Place a new, lubricated white washer (18) onto the valve stem (19), followed by the metal spacer (17) and lubricated o-ring (16). NOTE: Before continuing, closely examine the back up ring (15). You will note that it has a flat side and a concave side. For correct assembly the concave side should be against the o-ring (16), as shown in the picture below. 17. Attach a 3/4" crowfoot or medium deep-well socket to a torque wrench and tighten the bonnet to 90±3 in/lbs. CAUTION: DO NOT over-torque.
SEA MK Technical Maintenance Manual Second Stage Reassembly 8 7 1. Install a new exhaust valves (56) by inserting the stem of the exhaust valve through the center hole of the exhaust port. Pull the stem all the way through until the mushroom plug pops through the hole and keeps the valve securely in place. Examine the flap of each exhaust valve to make sure it is laying flat and is not distorted or folded under.
5. Install a new inlet fitting o-ring (14) in the groove located between the wrench flats and shorter threads. 9. Place the washer (46) over the threads of the stem. Thread a new locknut (44) onto the stem. Using a 1/4" nutdriver, tighten the locknut until about two threads show past the locknut. two threads 46 44 6. Take the used low pressure (LP) seat that was removed during disassembly and place it on top of the crown sealing surface inside the inlet fitting (52).
SEA MK Technical Maintenance Manual 13. Close the SEA on/off valve by turning the handwheel clockwise. Purge the air from the system by pressing down on the lever. Remove the valve/inlet assembly from the hose. While depressing the lever with your finger, unscrew the inlet fitting from the valve body. Press lever to relieve pressure. 18. Install the mouthpiece (58) onto the box bottom. Loosely fasten a tie-strap clamp (55) over the slots at the base of the mouthpiece.
WARNING: The SEA MK is designed to assist helicopter crew members and passengers in emergency egress situations from submerged aircraft. It is very critical to ensure that no leakage is present, and that the unit has met all requirements in the Final Testing Procedures outlined above.
SEA MK Technical Maintenance Manual Table 1: Troubleshooting Guide First Stage/Valve Assembly Symptom Possible Cause Treatment LP system will not remain depressurized 1. The valve seat (20) is worn or damaged. after valve is shut and second stage is purged. 2. The valve seating surface is damaged. 1. Replace valve seat. 1. The valve seat (20) is worn or damaged. 1. Replace valve seat . 2. The valve seating surface is damaged. 2. Replace body (36). 3. The main spring (35) is defective. 3.
Table 2: Troubleshooting Guide Second Stage (continued) Symptom Low purge or breathing effort is too high (full cylinder) External Air Leak (Immersion Test) Water entering second stage Possible Cause Treatment 1. Low MP (should be 135±20 psi). 1. Refer to Table 1: Troubleshooting Guide First Stage, p. 18. 2. The lever (45) is set too low. 2. Readjust locknut. 3. The lever (45) is bent. 3. Disassemble second stage and replace lever. 4. The poppet spring (49) is incorrectly installed. 4.
SEA MK Technical Maintenance Manual Table 3: List of Tools and Service Kits PART # DESCRIPTION APPLICATION 108361 Tool Pouch SEA MK / LV2 Tool holder 111610 Test Gauge 0-400 psi Checking medium pressure 108362 Soft Case, IP Test Gauge IP test gauge 108325 SCUBA Fill Adapter IP testing and filling 944022 O-ring Tool Kit Removing and installation of o-rings 10-102-400 O-ring Tool Internal hose o-ring (16) 100188 Micra Retaining Ring Wrench Retaining ring removal and installation 10
Table 3: List of Tools and Service Kits (continued) PART # DESCRIPTION APPLICATION 820466 Christo-Lube MCG III 2 oz.
SEA MK Technical Maintenance Manual Table 3: List of Tools and Service Kits (continued) PART # DESCRIPTION APPLICATION 9-44572 9-44385 9-44592 3/8” & 7/16” Wrench 1/2” Wrench 5/8” & 9/16” Wrench MRS III 9-44605 12’ Adjustable Wrench MRS III 947448 Medium Blade Modified Screwdriver Handwheel retainer nut (7) 9-41971 1/4” Nut Driver Lock nut (44) 5682A28 #2 Phillips Screwdriver MRS III 111100 Circlip Pliers MRS III 9-44363 3/8” Drive, Flex Handle Removal of parts 053035 Valve Han
Table 3: List of Tools and Service Kits (continued) PART # DESCRIPTION APPLICATION 820467 Christo-Lube MCG III 16 oz. tube Lubrication 100398 HABD/SEA Vise Jaw Inserts SEA cylinder removal and installation for use w/ existing vice HABD/SEA Table Mount Bottle Vise SEA cylinder removal & installation Torque Wrench ft/lbs / in/lbs Apply torque to parts listed in Table 4: Torque Specifications, p. 24 100397 N/A NOTE: Photos of tools contained in the SEA tool kit are representative.
SEA MK Technical Maintenance Manual Table 4: Torque Specifications PART # DESCRIPTION / KEY ITEM # TORQUE 108312 1st stage body (item 36/1st stage) 25±2 ft/lbs / 33.9±3 Nm 102812 Swivel port plug (item 1/1st stage) 60±3 in/lbs / 6.8±.3 Nm 054201 Burst plug (item 6/1st stage) 90±3 in/lbs / 10.2±.3 Nm 108318 Bonnet (item 13/1st stage) 90±3 in/lbs / 10.2±.3 Nm 108308 Fill adapter port (item 23/1st Stage) 90±3 in/lbs / 10.2±.
Procedure A: Cleaning and Lubricating Cleaning Brass and Stainless Steel Parts 1. Preclean in warm, soapy water* using a nylon bristle tooth brush. 2. Thoroughly clean parts in an ultrasonic cleaner filled with soapy water. If there are stubborn deposits, household white distilled vinegar (acetic acid) in an ultrasonic cleaner will work well. DO NOT place plastic, rubber or silicone parts in vinegar. 3. Remove parts from the ultrasonic cleaner and rinse with fresh water.
SEA MK Technical Maintenance Manual S.E.A. First Stage with Cylinder Assembly 29 30 38a, 38b, 38c 31 32 4 27g 27b 25 27d 27f 27e 33 34 35 Wrench Tight 27a 22 NLA - No Longer Available Key # Part # 27 18 16 23 25 26 90 ± 3 in. lbs. (10.2 ± .3 Nm) Description ........108343 Overhaul Service Kit ........108311 First Stage, Spare ........108469 First Stage, Spare, USCG/CBP 1........108305 Port Plug, Swivel, Black ........108333 Port Plug, Swivel, Chrome 2........
MK Second Stage Exploded Parts 40 41 42 45 44 58 47 48 46 49 43 50 55 51 16 54 14 56 52 57 45 ± 3 in.lbs. 5.0 ± .3 Nm 50 ± 3 in.lbs. 5.6 ± .3 Nm 16 Key # Part # Description ........108344 Overhaul Parts Kit ........108315 MK Second Stage Assy., Spare ........108468 Mk Second Stage Assy., Spare USCG/CBP 14........820015 O-ring (10 pk) 16........820010 O-ring (25 pk) 40........100904 Purge cover 41........100906 Ring, Reetaining Threaded 42........100909 Ring Cover Support 43........
SEA MK Technical Maintenance Manual Maintenance Notes
Maintenance Notes
S.E.A. MK 2340 Cousteau Court • Vista, CA 92081 Phone (760) 597-5000 • Fax (760) 597-4900 www.aqualung.com/militaryandprofessional ©2010 Aqua Lung International PN 108348 Rev.
