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Unscrew the screws (Torx 20), loosen the visor frames, and remove the visor (Fig. A)
Place a new visor in the faceblank (with the marking
”UP” on the visor showing upwards).
Align the check marks of the visor and faceblank with each other (Fig. B).
Position the visor frames and tighten both screws (Fig. C).
Carry out the leak-tightness test (point 5.1).
5.3 Replacing the exhalation valve disc
Pull out the valve cover (Fig. D).
Separate the disc (yellow) from the valve body (pinch on the edge of the disc) (Fig. E).
Replace the disc. Press lightly on the tip of the disc to secure a good fit (Fig. F).
5.4 Replacing the inhalation valve discs
Remove the rubber valve seat by pushing it with a finger from the inside of the mask (Fig.
G).
Replace the disc (pass the tail through the central hole to the inside of the mask) (Fig. H).
Put the valve seat back to the bottom of the valve body (Fig. J). Do not press too tight (the
disc comes immobilised) because the disc must be free to move.
The valve discs of the inner mask are replaced similarly. Make sure that the rubber edge of
the inner mask comes in the valve seat groove.
5.5 Replacing the speech diaphragm
Remove the inner mask from around the speech diaphragm (Fig. K).
Press the clip to remove the speech diaphragm (Fig. L
–M). To make assembly easier,
moisten the O-ring with water. Press the speech diaphragm into place.
Insert inner mask into place.
5.6 Replacing the harness buckle
Press the buckle downwards (Fig. N).
Hold the buckle and twist the rubber endpiece through the gap to the other end of the
buckle (Fig. O
–P) (the buckle rotates 180 ).
Remove the buckle (Fig. Q).
Assemble in reverse order.
5.7 Replacing the inner mask
Remove first the inhalation valve seat by pushing it with a finger from the inside of the
mask (Fig. G).
Gently pry open the hole on the fastening ring of the inner mask, using a screwdriver (via
the inh. valve body opening) until the fastening ring comes off (Fig. R).
Remove the inner mask (Fig. S).
When assembling, insert the notch of the fastening ring into the tip of the exhalation valve
(Fig. T) and press the inner mask into place.
