Aqua Lung MISTRAL SECOND STAGE Technical Maintenance Manual
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Aqua Lung MISTRAL SECOND STAGE Technical Maintenance Manual

Aqua Lung MISTRAL SECOND STAGE Technical Maintenance Manual

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Authorized Technician
TECHNICAL MAINTENANCE MANUAL
MISTRAL SECOND STAGE

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Summary of Contents for Aqua Lung MISTRAL SECOND STAGE

  • Page 1 Authorized Technician TECHNICAL MAINTENANCE MANUAL MISTRAL SECOND STAGE...

  • Page 2: Table Of Contents

    Table 2: List of Tools and Service Kits ....................12 Table 3: Recommended Cleaners and Lubricants ................13 Procedure A: Cleaning and Lubricating ....................14 Table 4: Torque Specifi cations ......................15 Table 5: Checking Specifi cations ......................15 Maintenance Notes ..........................16 Exploded View of Mistral Second Stage .....................17...

  • Page 3: Copyright Notice

    Aqua Lung Service & Repair Seminar. If you do not completely under- procedure. stand all of the procedures outlined in this manual, contact Aqua Lung to 4. Use only genuine Aqua Lung parts provided in the overhaul parts speak directly with a Technical Advisor before proceeding any further.

  • Page 4: Disassembly Procedures

    DISASSEMBLY PROCEDURES 3b. If the corrugated hoses are attached by clamping bands, use a small blade screwdriver and loosen the bands. NOTE: Before performing any disassembly, refer 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 –...
  • Page 5 Mistral Second Stage Technical Maintenance Manual 12. Place the handle of the seat extraction tool (p/n 109437) NOTE: Aqualung no longer requires directly over the poppet bearing (12) in the top center of the mandatory replacement of the exhaust valve body (11), and press downward until the poppet valves.

  • Page 6: Reassembly Procedure

    REASSEMBLY PROCEDURE 15. When the crown (16) has been unthreaded from the inlet fi tting (19), carefully insert the pin of the seat extraction tool into the opposite end of the inlet fi tting and through the NOTE: Before performing any reassembly, it center of the crown.
  • Page 7 Mistral Second Stage Technical Maintenance Manual 4. Using the crown adjusting tool (p/n 125727), engage the 8. Stand the poppet (14) on its head inside the top of the inlet slotted head of the crown (16) and drive it in clockwise as fi...
  • Page 8 CAUTION: Prior to adjusting and testing the Mistral second stage regulator, the acompanying fi rst stage must be correctly serviced and adjusted to a stable medium 12. Hold the valve body assembly (8-15) stationary and pressure of 135 ±5 psi and fully tested.
  • Page 9 Mistral Second Stage Technical Maintenance Manual Properly position the face of the adjusting tool (p/n 125727) on the 21. Fit 4 new locknuts (7) into the inhalation box, then tighten top of the sealing ring (4). Using a ¼" nut driver, tighten or loosen the screws (1) using a 3 mm allen key until snug.

  • Page 10: Final Testing Procedures

    FINAL TESTING PROCEDURES b. Align the mold lines on the corrugated hose and box. Install the “R” clamping band so that the lugs are in the same line as the fi rst stage body. Using a small NOTE: Before performing the following blade screwdriver, tighten all clamping bands.
  • Page 11 Mistral Second Stage Technical Maintenance Manual Table 1: Troubleshooting Guide SYMPTOM POSSIBLE CAUSE TREATMENT 1. Refer to First Stage Troubleshooting 1. MP is too high. Guide 2. LP seat (14) is worn or damaged. 2. Replace the seat 3. The crown (15) is not correctly adjusted.
  • Page 12 Table 2: List of Tools and Service Kits PART # DESCRIPTION APPLICATION MP Pressure Gauge 0-400 psi MP Pressure Gauge 0-400 psi 111610 Checking medium pressure Crown and Lever Adjusting Tool Crown and Lever Adjusting Tool 125727 Adjust crown (16) and lever (10) Seat Extraction Tool Seat Extraction Tool 109437...
  • Page 13 Mistral Second Stage Technical Maintenance Manual Table 3: Recommended Cleaners and Lubricants LUBRICANT/CLEANER APPLICATION SOURCE Aqua Lung, PN 820466, or Lubrication Technologies ® ® ® Christo-Lube MCG 111 MCG 111 All o-rings 310 Morton Street Jackson, OH 45640 (800) 477-8704...

  • Page 14: Procedure A: Cleaning And Lubricating

    When it comes to issues of nitrox safety and compatibility, the concerns lie primarily with the regulator’s fi rst stage as it is subjected to high inlet pressures. High inlet pressures lead to adiabatic compression or heating of the gas. The Aqua Lung 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 15 Mistral Second Stage Technical Maintenance Manual Table 4: Torque Specifi cations PART # DESCRIPTION / KEY ITEM # TORQUE 104106 Inlet fi tting (19) 85 in/lbs Table 5: Checking Specifi cations TEST CONDITION SPECIFICATIONS Leak Test Inlet 2500 - 3000 (± 100 psig) No leaks allowed Inlet 2500 - 3000 (±...

  • Page 16: Maintenance Notes

    Maintenance Notes...

  • Page 17: Exploded View Of Mistral Second Stage

    Mistral Second Stage Technical Maintenance Manual Second Stage Key # .Part # Description Key # .Part # Description ..125920 Mistral Second Stage 9 ..104129 Washer ..900016 Overhaul Parts Kit, Entire Mistral 10 ..125708 Lever 11 ..125931 Valve insert 1 ..125929...
  • Page 18 Authorized Technician TECHNICAL MAINTENANCE MANUAL MISTRAL SECOND STAGE Aqua Lung America 2340 Cousteau Court, Vista CA 92081 760-597-5000 www.aqualung.com © © © Aqua Lung USA Aqua Lung USA Rev 2/2006...

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