1. Apeks XTX 2nd Stage Regulator

2. Please Turn Off The Cell Phones

3. ©2006 Aqua Lung International, Inc Apeks XTX Service Program
Copyright Notice
This program 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 form without prior consent in writing from Aqua Lung
International. It may not be distributed through the internet or
computer bulletin board systems without prior consent in
writing from Aqua Lung International
©2006 Aqua Lung International, Inc
Apeks XTX Service Program

4. Features Pneumatically Balanced Valve Design
Ratcheting, indexable venturi control
and user adjustment knob (200,100 & 50)
Diver Changeable Exhaust (DCE)
Allows diver to change between a large tee for bubble dispersion and a small tee for compactness
Left/Right Hose Reversibility
Can be configured for left or right hand use
Suitable For Coldwater Use
Can be used in water temps below <50F (Except XTX20)

5. Begin Disassembly
Click here for left-handed conversion

6. Remove Hose
Use two 11/16” wrenches

7. Remove Hose O-rings
Use O-ring removal tool (p/n )

8. Inspect Hose Crimps

9. Remove Case Cover
XTX Cover Tool (p/n AT20)

10. Remove Washer & Diaphragm

11. Remove Purge Button (optional)
Press in tabs
Remove spring & purge button

12. Turn Adjustment Knob Out
Prevents pin from falling out

13. Remove Heat Exchanger
11/16” wrench

14. Remove Valve Spindle
Hold lever down
Slide out valve spindle assembly

15. Remove Blanking Piece & O-rings

16. Remove Venturi & O-ring

17. Separate Ring From Venturi (optional)
Only necessary if changing hose direction

18. Remove Pin & Adjustment Knob
Turn in adjustment knob
Pin should fall out
Remove adjustment knob

19. Remove Adjustment Knob O-ring
Pinch method: Push on opposite sides to create a protrusion

20. Remove Plug & Spring Adjuster
5mm hex key

21. Remove O-rings

22. Remove Valve Spindle O-ring

23. Remove Shuttle Valve Assembly
Push out with 1/16” dowel

24. Separate Shuttle Valve Assembly

25. Remove LP Seat & Balance O-ring

26. Inspect Counter Balance Chamber
Inside sealing area

27. Remove Crown Use a medium bladed screwdriver Carefully push out crown
Loosen crown 6-7 turns to disengage threads
Carefully push out crown
Use seat extraction tool (p/n )

28. Remove Crown O-ring

29. Critically Inspect Crown
Sealing area
O-ring groove

30. Remove Lever (optional)

31. Inspect Lever

32. Straighten Legs If Necessary

33. Remove Spindle Collar

34. Remove Exhaust Tee Push on button to disengage exhaust tee
Slide left and right exhaust tee away from case

35. Remove Exhaust Rib (optional)
Remove if damaged
Only on large exhaust tee
Lift up on rib to remove

36. Inspect Exhaust Valve
Normally not replaced
Remove if damaged

37. Remove Mouthpiece Side cutters Inspect mouthpiece for holes or tears
Snip tie wrap buckle
Inspect mouthpiece for holes or tears

38. Cleaning & Lubrication Procedures
Click here to skip past
Cleaning & Lubrication Procedures and go straight to Reassembly

39. Cleaning & Lubrication
Brass and Stainless Steel Parts
Pre-clean in warm soapy water; nylon bristle brush
Ultrasonically clean with soapy water; vinegar OK on tough corrosion
Rinse in fresh water; use distilled water if tap water is “hard”
Blow dry with LP hydrocarbon free gas (for EAN use)

40. Cleaning & Lubrication
Aluminum, Plastic & Rubber Parts
Soak in warm, soapy water
Use soft nylon bristle brush to remove deposits
Rinse with fresh water
Blow dry with LP hydrocarbon free gas (for EAN use) !
CAUTION: DO NOT soak plastic parts in acidic solutions

41. Cleaning & Lubrication
Hoses
Soak hose ends only
Do not allow solution to enter hose
Rinse with fresh water
Dry with hose ends hanging down
Blow out hose before installing

42. Cleaning & Lubrication
Christo-lube MCG 111
Light film only Rinse with fresh water
Remove visible excess
If regulator will be used with EAN, you should wear powderless, latex gloves (or equivalent) when lubricating and handling o-rings

43. Begin Reassembly

44. Install Exhaust Valve (if removed)
Make sure barb pulls completely thru hole
Trim exhaust barb
Leave 5mm

45. Install Exhaust Rib (if removed)
Place into left side of large exhaust tee

46. Install Exhaust Tee Slide left tee into groove
Slide right tee on until button engages

47. Install Valve Spindle O-ring

48. Install Spindle Collar
Square hole on spindle collar faces threaded end of valve spindle
Use reversible circlip pliers
Square hole
Spread collar & place onto valve spindle

49. Rotate Spindle Collar With lever to the right & upward
Rotate spindle collar for right hand use
Opening on valve body should be clear

50. Install Shuttle Valve O-ring & MP Seat

51. Assemble Shuttle Valve
Push spring onto counter balance chamber
Insert shuttle valve into CB chamber

52. Install Shuttle Valve Assy
Lever points upward
Shuttle valve feet face down from lever

53. Install Adjustment Knob O-ring

54. Install Adjustment Screw O-rings

55. Install Adjustment Screw
5mm hex key
Screw in until head of adj. screw is flush with end of knob
Turn in 6-additional revolutions

56. Install Adjustment Knob
Lever should have tension
Screw in until pin hole is clear
Pin hole

57. Install Pin Pin should stick out evenly on both sides
Back out knob to hold pin in place

58. Install Ring On Venturi
Slide ring onto venturi lever
Align arrow on ring to “RIGHT” mark on venturi

59. Install Ring On Venturi
Pull ring firmly to install
Ring will audibly click into place
Install new O-ring

60. Install Venturi On Right Side
Look for “RIGHT” marking inside case

61. Install O-ring & Blanking Piece

62. Install Valve Spindle Hold lever down
Slide in valve spindle assembly
Do not allow lever to spring back up quickly

63. Install O-ring & Heat Exchanger

64. Torque Heat Exchanger Use a torque wrench & 11/16” crow foot
Torque the heat exchanger to 45 in/lbs
Make sure lever is straight

65. Air Hole Should Face Up

66. Install Crown Install new O-ring Use blunt end of seat tool
Press crown into valve spindle until it stops

67. Adjust Crown Use a medium bladed screwdriver
Turn crown in until lever drops ¼ inch
Back crown out until lever is even with the case rim

68. Replace Purge Button Set spring onto purge button
Turn purge button over and push into case cover

69. Install Diaphragm & Washer

70. Install Case Cover Use AT20 tool Tighten cover until it stops
Confirm the purge button is properly aligned

71. Install Hose O-rings

72. Final Testing Attach Inline tool (p/n:100190) onto second stage
Use a properly adjusted first stage or test bench, slowly pressurize to 3000 psi

73. Final Testing Use AT20 tool
Push “NO GAS FLOW” side of tool into purge button until it stops
There should be no audible flow of air
If there is airflow, use inline tool and turn crown clockwise 1/16 turn
Repeat first step

74. Final Testing Use AT20 tool
Push “GAS FLOW” side of tool into purge button until it stops
There should be an audible flow of air
If there is no airflow, use inline tool and turn crown counter- clockwise 1/16 turn
Repeat first step

75. Final Testing Install hose Use a torque wrench & 11/16” crow foot
Torque the hose to 45 in/lbs

76. Final Testing Opening effort specifications
Use a magnehelic, the opening effort should be between inches of water
To adjust opening effort, use a 5mm hex key & turn the adj. screw
Clockwise will increase the effort
Counter-clockwise will decrease the effort

77. Final Testing
Install cap

78. Final Testing Check for leaks Immerse second stage underwater
Look for streaming bubbles; don’t mistake trapped air for leaks
Note leak source; refer to troubleshooting table in service manual

79. Install Mouthpiece

80. This Concludes The XTX Repair Course

81. Begin Left-Hand Conversion
Click here to return to repair course

82. Remove Hose & Case Cover
Use two 11/16” wrenches
XTX Cover Tool
(P/N AT20)

83. Remove Washer & Diaphragm

84. Turn Adjustment Knob Out
Prevents pin from falling out

85. Remove Heat Exchanger
11/16” wrench

86. Remove Valve Spindle
Hold lever down
Slide out valve spindle assembly

87. Remove Blanking Piece & Venturi
There are two O-rings with the blanking piece
Remove O-ring from venturi

88. Disengage Ring From Venturi
Push down on ring to disengage from venturi body

89. Rotate Ring 180 Degrees Align arrow on ring to “LEFT” mark on venturi
Pull ring into position
Ring will audibly click into place

90. Install Venturi O-ring

91. Install Venturi On Left Side
Look for “LEFT” marking inside case

92. Install Blanking Piece

93. Rotate Spindle Collar Turn spindle collar 180 degrees
Make sure air hole is completely exposed
Confirm spindle collar is correctly positioned

94. Install Valve Spindle Hold the lever down Install O-ring
Insert valve spindle into left side of case
Do not allow the lever to spring back up quickly
Install O-ring

95. Torque Heat Exchanger Install Heat Exchanger finger tight
Use a torque wrench & 11/16” crow foot
Torque the heat exchanger to 45 in/lbs
Make sure lever is straight

96. Air Hole Should Face Up

97. Install Diaphragm & Washer

98. Install Case Cover & Hose
XTX Cover Tool
Tighten cover until it stops
Confirm purge button is properly alligned
Use a torque wrench & 11/16” crow foot
Torque the hose to in/lbs

99. Pressurize & Test
Pressurize to 3000 psi
Check breathing performance

100. Check For Leaks Immerse second stage underwater
Look for streaming bubbles; don’t mistake trapped air for leaks
Note leak source; refer to troubleshooting table in service manual

101. This Concludes Left-Hand Conversion