MSA Advantage 4000 Series Operation And Instructions Manual page 18

Before use, perform negative pressure test to insure
proper reassembly of Advantage 4000 Respirator. If
any portion of facepiece does not seal, remove from
service and inspect/service immediately.
Before installing a new lens, check the blank groove
for dirt or other debris, which may interfere with a seal
between the lens and blank.
Reassembling the Lens
1. Insert the top of the lens into the top of the facepiece
blank.
2. Mold the blank around
the lens, checking to
be sure that the lens is
centered in the face-
piece blank.
3. Stretch the blank enough to insert the bottom of the
lens into the blank.
4. Guide the lens into the blank groove all the way
around the lens. Ensure the lens is fully captured in
the blank groove.
5. Guide the top lens ring over the outside of the face-
piece blank lens groove, ensuring that the harness
straps are at the back of the facepiece.
6. Guide the bottom lens ring over the outside of the
bottom facepiece blank lens groove.
7. Work the lens rings
down on to the face-
piece blank to line-up
the threaded ends as
close as possible with-
out bending the lens.
TAL 018 (L) Rev. 6 - 10073772
INSPECTION
8. Install one Phillips
screw in the top lens
ring-mounting flange
and thread it about
halfway into the oppo-
site lens ring flange.
9. Install the remaining Phillips screw in the other lens
ring-mounting flange and thread it about half way into
the opposite lens ring flange.
10. Alternate tightening the screws until the lens is secure.
11. Reinstall the Component Housing parts as described
above.
12. Don the facepiece and perform the Negative Pressure
Seal Test
RUBBER HARNESS STRAPS DISASSEMBLY
Top Straps
Unbutton the top straps
and slide the straps back
through retainer. Pull the
top straps through slot in
lens rings.
Bottom Straps
Unthread both bottom straps through the buckles.
Buckles
The bottom buckles are
detachable. Grasp the
buckle and the facepiece
tab and push them togeth-
er until the button is free.
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