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ENGLISH
INSPECTION & MAINTENANCE
W WARNING
1. Failure to follow these instructions may reduce respirator performance, overexpose you to
contaminants, and may result in sickness or death.
a. Do not use with parts or accessories other than those manufactured by 3M as described in
these User Instructions or on the NIOSH Approval Label for this respirator.
2. Failure to follow these instructions may reduce the capability of the M-300 and M-400 Series
Headgear Shell to withstand impact and penetration and may result in serious injury or death:
a. Do not use beyond the maximum life of the product.
Before and after each use, inspect entire headgear for signs of damage or wear including dents,
rips, cracks, color changes, chalking, fading, aking and penetration. Carefully inspect all headgear
components including the following:
• Visor and visor frame: Look for scratches or other visual distortions that could make it difcult to
see through the visor. Look for signs that the visor has warped or cracked. A warped visor may not t
properly into the headgear and on the M-400 Series may not seal against the jaw. Ensure the visor
stays rmly in the up (open) and down (closed) positions. Ensure visor buttons are present, rmly
secured, and ush to the visor frame. Examine the visor gasket for tears or other damage. Gasket
should be pliable and not brittle.
• Head suspension: Look for cracks, rips, fading, or other damage. Ensure head suspension ratchet
operates properly. Inspect the web straps for rips, tears, fraying, or fading. Look for worn stitching.
Ensure straps are properly attached.
• Faceseal or inner and outer shroud: Look for tears, holes, stretched elastic, gaps in seams, damage to
stitching or other damage. Examine the gasket for tears or other damage. The gasket should be pliable
and not brittle. Ensure faceseal or inner and outer shroud is securely and properly attached. Inspect the
zipper of the inner shroud and ensure shroud is completely attached to outer shroud.
• Headgear shell: Look for visible damage including dents, cracks, color change, chalking or fading.
Any M-300/M-400 Headgear subjected to impact should be removed from service and replaced even
if damage is not readily apparent.
• Forehead seals: Ensure they are properly and securely attached and are free from damage.
• Breathing tube: Look for tears, holes or cracks. Bend the tube to verify that it is exible. Ensure the
gasket located in the QRS is present and not damaged. Inspect the gasket located on the bayonet
end of the breathing tube (i.e. end that connects to the air source) for signs of damage. The breathing
tube should t rmly into the air source connection.
• PAPR blower assembly: Inspect according to the User Instructions for your specic air source.
Inspect date codes on visors, shells, and other plastic components and ensure parts have not exceeded
their maximum life. See “Expected Life” section of these User Instructions for additional information.
If you discover any signs of wear and/or damage, remove headgear from use and service or
replace as appropriate. Failure to do so may affect respirator performance and reduce the degree
of protection provided.
REPLACEMENT PARTS AND ACCESSORIES
Replacement Parts
W WARNING
1. Failure to follow these instructions may reduce the capability of the M-Series visors to
withstand impact and penetration and may result in serious injury or death:
a. Ensure visor buttons are rmly secured and ush to the visor frame. Replace worn or damaged
parts if required.
2. Failure to follow these instructions may reduce respirator performance, overexpose you to
contaminants, and may result in sickness or death.
a. Always properly assemble and wear both the inner and outer shroud (M-400 Series).
b. Do not use with parts or accessories other than those manufactured by 3M as described in
these User Instructions or on the NIOSH Approval Label for this respirator.
3. Do not use the head, neck, and shoulder cover or non-ame resistant faceseals and shrouds
around high heat, sparks or ames. Misuse may result in serious injury or death.
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