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Spare Parts
3M™ FR-M40-101 Head Harness (Figures 24 and 25)
fig. 24 fig. 25
1. Lengthen head harness to its full extent and then work tabs at the ends of the head harness straps out
of buckles.
2. To install a new head harness, lay mask face down on a non-abrasive surface with the exhalation valve
closest to you.
3. Position harness in mask assembly with backpad harness tab pointing toward you and harness cross
strap on top of upper head straps.
4. Work head harness straps into buckles by pushing through lower part of slide then folding over onto
itself and pushing back through upper part of slide.
5. Pull straps through approximately 1 inch (2.5 cm) so that head harness straps ends are laying on the
outside.
6. Stretch head harness away from mask assembly and check that the buckles hold head harness straps
tightly.
3M™ FR-M40-102 Inhalation Valve Kit (Figure 26)
fig. 26
1. Remove cartridge from the facepiece.
2. Grasp the inhalation valve body at the two tabs that stick out away from the facepiece, and pull straight
away.
3. Discard damaged valve disk and seat assembly.
4. To install a new inhalation valve kit, insert the inhalation valve seat body, with the inhalation valve
facing in, at a slight angle into the side port of the facepiece.
5. After initially catching a portion of this groove on the metal flange, press the valve seat body down all
around the circumference into the facepiece side port until the valve seat body is fully seated in the side
port.