6
XL4 2nd Stage Maintenance Manual
Removal of Mouthpiece
CAUTION: Take care not to damage or distort
the Lever (15) when removing the Venturi
Lever (9). DO NOT depress the tab of the
Venturi Lever too far, as this will result in
permanent deformation.
Removal of hose
Removal of Exhaust Tee
Removal of Front Cover & Diaphragm
Removal of Venturi Lever & Spindle
3. Pull back the two Hose
Protectors (29) and inspect
the hose crimps. If either
crimp is damaged or the
hose is pulling out of the
crimp then the hose must
be replaced.
NOTE: Before starting reassembly refer to Hose
Inspection & Cleaning Procedure found on page 4.
2. Remove O Rings (17) and (28) from the hose (30).
Exercise caution not to scratch the O Ring groove in the
hose swivel.
1. Using a 13/16” spanner
hold the Inlet Shroud (18)
whilst undoing the hose
with an 11/16” spanner
(AT39).
4. Place one nger into
each side of the Exhaust
Tee (7) and squeeze them
together. Pull the Exhaust
Tee away from the Case
(13).
5. Unfasten the Mouthpiece Clip (12) and pull the
Mouthpiece off the Case(13)
6. To remove the XL4 Clamp Ring (1) place your thumb on
the top of the clamp ring as shown on the rst image below.
Grip the rest of the clamp ring and turn anti-clockwise.
Separate the Purge Clamp Ring (1) from the Purge Button
assembly and the Case (13).
NOTE: Failure to hold
the Clamp Ring as
outlined in section 6 may
result in the cover being
more difcult to remove
due pressure being
applied to the locking
mechanism.
7. Locate the three kidney shaped pegs of the AT71
Locking Ring Tool into the slots of the Inner Locking Ring
(4). Unscrew the Inner Locking Ring (4). Remove the
Friction Ring (5) and the Diaphragm (6) from inside of the
Case (13).
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