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5. Place new exhalation valve replacement over the exhalation port by inserting stems and pulling through from the
opposite side until they are both snapped in place. Push laterally on valve stems to ensure they are properly seated.
6. Replace exhalation valve assembly.
7.
Replace exhalation valve cover.
Nose Cup Assembly Replacement
The nose cup assembly consists of a nose cup and inhalation valves. It is designed to install directly to the lens and
comfortably fit over the respirator wearer's mouth and nose to aid in purging exhaled breath and prevent lens fogging.
1.
Remove the nose cup assembly by grasping the hard plastic ring of the nose cup, where it attaches to the lens, and
gently pulling it up and away from lens assembly (Fig. 15).
2. To replace, position nose cup assembly onto lens assembly by aligning hard plastic ring on nose cup with lens assembly
and pressing firmly on center tabs until bottom nose cup tabs snap in place (Fig. 16).
3. Press down on top of nose cup ring until tabs snap in place.
Speaking Diaphragm Assembly Replacement
1.
Remove the nose cup assembly by grasping the hard plastic ring of the nose cup, where it attaches to the lens, and
gently pulling it up and away from lens assembly (Fig. 15).
2. Remove exhalation valve cover by gently pulling left and right side of cover away from the facepiece (Fig. 12).
3. Remove exhalation valve assembly by turning counter clockwise 1/4 turn (Fig. 14).
4. Remove speaking diaphragm assembly by turning counter clockwise 1/4 turn (Fig 17).
5. Replace speaking diaphragm assembly by aligning speaking diaphragm lugs with speaking diaphragm opening in lens
assembly.
6. Turn clockwise 1/4 turn until firm stop.
7.
Replace exhalation valve assembly.
8. Replace exhalation valve cover assembly.
9. Replace nose cup assembly (Fig. 16).
Inhalation Valve Assembly
The inhalation valve assembly consists of the cartridge/filter adapter, retainer ring, and inhalation valve.
1.
Remove the nose cup assembly by grasping the hard plastic ring of the nose cup, where it attaches to the lens, and
gently pulling it up and away from lens assembly (Fig. 15).
2. Remove attachment ring by rotating counter clockwise 1/4 turn (Fig. 18).
3. Remove cartridge/filter adapter from lens assembly (Fig. 19).
4. Align key on new cartridge/filter adapter with slot on lens assembly and hold firmly in place.
5. Align lugs on ring with slots on cartridge/filter adapter and rotate clockwise 1/4 turn until firm stop.
6. Replace nose cup assembly (Fig. 16).
Inhalation Valve Replacement
Inhalation valves are located on the inhalation valve assemblies at the facepiece inhalation ports and inside the nose cup
inhalation ports. These 4 valves should be inspected before each respirator use and replaced whenever valves become
damaged or lost.
1.
Remove existing valve(s) by grasping valve and pulling valve stem out from valve seat.
2. Install new valve(s) onto valve seat(s) by pushing through valve stem seat(s). Be certain valve stem(s) is fully engaged
through valve seat(s), lays flat, and moves freely (spins).
Head Harness Assembly Replacement
1.
Remove existing head harness by unsnapping each buckle from the buttons (Fig. 20).
2. Pull the end tabs of the head harness, at an angle, out through the buckles. Note the orientation of the head harness tabs
and buckles for re-assembly.
3. Place the head harness down on a flat surface with the 3M logo facing up (Fig. 21).
4. Thread the end tabs of the head harness through the buckles and pull each through until the end tab is completely
through the buckle.
5. Place the facepiece lens down on a flat surface and lay the new head harness and buckle assembly over the facepiece.
The head harness should be assembled with the 3M logo facing up.
6. Snap each buckle into corresponding button, ensuring that straps are not twisted.
Lens Frame Assembly Replacement
The lens frame assembly consists of a lens frame, nuts, and screws.
1.
Remove the Phillips screws from frame. Pull the frame away from the faceseal (Fig.22 and 23).
2. Position new frame, aligning marks top and bottom. Install and securely tighten screw. Make certain alignment marks are
properly aligned top and bottom with all components.
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