Aqua Lung LEG3ND ELITE SECOND STAGE Technical Maintenance Manual
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Aqua Lung LEG3ND ELITE SECOND STAGE Technical Maintenance Manual

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TECHNICAL MAINTENANCE MANUAL
SECOND STAGE

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Summary of Contents for Aqua Lung LEG3ND ELITE SECOND STAGE

  • Page 1 TECHNICAL MAINTENANCE MANUAL SECOND STAGE...
  • Page 2 CHANGE RECORD PAGE # DATE TITLE AND/OR BRIEF DESCRIPTION CHANGE MADE BY Change to Adjusting Screw setting. Pre-Adjustment setting change DEC 2,2022 AQUALUNG GROUP from 1 1/4 turns out to 3/4 turn out 15/20 MAY 11,2023 New Service Kit Part Number RA121136 AQUALUNG AMERICA MAY 11,2023 Changes to Tool List availability...

  • Page 3: Table Of Contents

    LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL CONTENTS COPYRIGHT NOTICE ....................4 GENERAL GUIDELINES ....................4 GENERAL CONVENTIONS ..................4 DISASSEMBLY PROCEDURES...................5 REASSEMBLY PROCEDURE ..................8 FINAL TESTING PROCEDURES ................12 TABLE 1: TROUBLESHOOTING GUIDE ..............14 TABLE 2: TOOL LIST & SERVICE KITS ..............15 TABLE 3: TORQUE SPECIFICATIONS ..............16 TABLE 4: TEST BENCH SPECIFICATIONS ..............16...

  • Page 4: Copyright Notice

    Do not rely on memory. ©2023 Aqualung International, Inc. Leg3nd Elite Second Stage Technical Maintenance Manual 2. All service and repair should be carried out in a work area specifically set up and equipped for the task. Adequate lighting, cleanliness, and easy access to all required tools are essential for an efficient repair facility.

  • Page 5: Disassembly Procedures

    LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL DISASSEMBLY PROCEDURE To remove the exhaust cover (34), use the seat extraction tool to push on the pin locker. Hold the pin locker all the way NOTE: Before performing any disassembly, refer to the exploded parts drawing, which references all mandatory replacement parts.
  • Page 6 Remove the ring (2) from the While keeping the lever front cover (1). (20) depressed, pull on the adjustment knob (29) and remove the valve body assembly (15-32) from the case (8). Lift off the purge cover (3). From the left side of the case (8), remove the spacer (13) and oring (14).
  • Page 7 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL Remove the pin (27) from the adjustment knob (29) by tapping Separate the shuttle valve (23), spring (25) and counter- or shaking the knob. Remove the oring (28) from the knob. balance chamber (26). Using your fingernail, remove the MP seat (22) and oring (24) from the shuttle valve.

  • Page 8: Reassembly Procedure

    REASSEMBLY PROCEDURE Typically, there is no need to remove the lever (20). Visually inspect it to make sure it is not bent or damaged in any way. Should there be a need to remove the lever, grasp one of the legs at the base and disengage one of the lever feet.
  • Page 9 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL Install o-ring (14) onto the valve body (19). Install oring (28) Insert the spring pin (21) evenly into the hole in the valve body onto the adjustment knob (29) (19). Loosen the adjustment knob (29) counter-clockwise until it applies tension on the pin to keep it from falling out.
  • Page 10 Add a new o-ring (15) Slide the oring (14) down the threaded end of the to the swivel end of the valve body (19). Slide the spacer hose (37). (13), with the flat edge facing out- ward, down the valve body. Rotate the spacer so it fits into the cutouts in the case (8).
  • Page 11 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL Turn off the air supply and purge the second stage by press- Press the metal ring (2) into place on the front cover (1). ing on the lever (20). Remove the hose (37) from the inline tool.

  • Page 12: Final Testing Procedures

    FINAL TESTING PROCEDURES Use the seat extraction tool to push the pin locker in. Slide the exhaust cover (34) onto the case (8). SECOND STAGE OPENING EFFORT TEST Attach the MP hose (37) to the second stage. While holding the heat exchanger (12) stationary with a 19mm (¾”) wrench.
  • Page 13 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL ADJUSTING THE OPENING EFFORT SUBJECTIVE BREATHING TEST Depress the purge cover fully to ensure that an adequate vol- To adjust the opening effort, use a 4mm hex key and turn the ume of air needed to clear the second stage flows through the adjusting screw (31) clockwise to increase the opening effort or mouthpiece.
  • Page 14 TABLE 1: TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE CAUSE TREATMENT 1. Refer to First Stage Troubleshooting Guide 1. High first stage MP 2. MP seat (22) is worn or damaged 2. Replace the MP seat 3. The crown (16) is not correctly 3.
  • Page 15 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL TABLE 2: TOOL LIST & SERVICE KITS PART # DESCRIPTION APPLICATION In-line Final adjustment and tuning www.scubatools Adjustment Tool In-line Test Gauge MP testing www.scubatools Seat Extraction/ Crown (16) removal/installation www.scubatools Installation Tool...
  • Page 16 TABLE 3: TORQUE SPECIFICATIONS PART # DESCRIPTION / KEY ITEM # TORQUE RH119117 MP Hose Male and Female Fitting (37) 40 in-lbs (4.5 Nm) RG911942 Heat Exchanger (12) 45 in-lbs (5 Nm) TABLE 4: TEST BENCH SPECIFICATIONS TEST CONDITION SPECIFICATIONS Leak Test Inlet 3000 psig (207 bar) No leaks allowed...
  • Page 17 LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL TABLE 5: RECOMMENDED CLEANERS & LUBRICANTS LUBRICANT/CLEANER APPLICATION SOURCE Christo-Lube ® MCG 111 Lubrication Technologies 310 Morton Street Jackson, OH 45640 (800) 477-8704 Lubricant for all o-rings Performance Fluids Ste 101 Lomeshaye Business Park...

  • Page 18: Procedure A: Cleaning & Lubricating

    PROCEDURE A: CLEANING & LUBRICATING AQUALUNG AND APEKS REGULATORS AND NITROX When it comes to issues of nitrox safety and compatibility, the concerns lie primarily with the regulator’s first stage as it is subjected to high inlet pressures. High inlet pressures lead to adiabatic compression or heating of the gas. The Aqualung or Apeks regulator product described in this manual, when properly cleaned and assembled, is authorized for use with enriched air nitrox (EAN) that does not exceed 40% (EAN 40).

  • Page 19: Maintenance Notes

    LEG3ND ELITE SECOND STAGE TECHNICAL MAINTENANCE MANUAL MAINTENANCE NOTES...

  • Page 20: Leg3Nd Elite Schematic

    LEG3ND ELITE 45 in-lbs 5 Nm 40 in-lbs 4.5 Nm 40 in-lbs 4.5 Nm KEY# PART# DESCRIPTION KEY# PART# DESCRIPTION ..RA121136 Overhaul Parts Kit 19 ..RG911645 Valve Body ..RS119004 Leg3nd Elite, Second Stage Only 20 ..RG912197 Lever 21 ..RG912025 1 ..RG911280 Front Cover w/Locker, Steel 22 ..RG912198 MP Seat...
  • Page 21 AUTHORIZED TECHNICIAN TECHNICAL MAINTENANCE MANUAL LEG3ND ELITE SECOND STAGE Aqualung International 2105 Rutherford Road, Carlsbad CA 92008 760-376-9201 www.us.aqualung.com Rev 05/2023...

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