3M L-905 Instructions d'installation
L-905 - Reassembly
© 3M June 2006. All rights reserved.
3M™ Helmet L-905 with Welding Shield
and Wide-view Faceshield
Reassembly
1) To reassemble the L-163 Foam Liner:
a. With the foam liner positioned such that the model number is
oriented to the front of the headgear shell, insert the foam liner into
the headgear shell. If the liner is hard to install, you are probably
inserting it backwards.
b. Reinstall the complete suspension assembly to secure the liner.
NOTE: The cut-out pockets in the foam liner must align for the
head suspension to fit into the headgear.
2) To replace the L-115 Sweat Pad:
a. Wrap the sweat pad around the headband, in the area that comes
into contact with your forehead.
b. Secure the sweat pad by closing the three snaps.
3) To replace the L-116 Head Pad:
a. Orient the head pad such that the padded surface is facing you
(so that it will be in contact with your head when installed in the
headgear).
b. Slip the head pad tabs into the four slots in the hanger suspension.
4) To replace the L-117 Hanger Suspension:
a. Place the ladder tabs in the slots on the headband, then turn the
four ladder tabs a quarter-turn.
5) To replace the L-113 Head Suspension:
a. Place the 4 mounting clips back into the slots in the headgear.
L-905 - Reassembly
© 3M June 2006. All rights reserved.
6) To replace the L-114 Chin Strap:
a. With the cam mechanism removed from the headgear, insert the
Chin Strap Attachment Plate into the pocket that contained the cam
clip.
7) To reassemble the L-146 Cam/Pivot:
a. Verify that the L-146 Cam/Pivot Kit is being used. The L-146 must
be used with the welding shield.
b. Insert the pivot post all the way into the cam.
c. Insert the cam/pivot back into the headgear.
d. Hold the cam/pivot in position, and secure it by inserting the cam
clip. Press the clip all the way in.
8) The L-136 Cam Spring Kit comes with two springs, one for the right
side and one for the left side. They are not interchangeable and will not
fit into the “wrong side”. To replace the cam spring clip:
a. Insert the hooked end of the spring clip into the opening at the
upper end of the frame assembly.
b. Insert the lower arm of the spring clip into the lower opening.
c. Snap the spring clip in place.
9) To reassemble the L-131 Wide-view Lens:
a. Remove the protective film lens coverings from both sides of the
lens (if they are present).
b. Hold the faceshield assembly flat.
c. Flex the lens to the shape of the faceshield assembly, and slide it
over the lower post and onto the upper post.
d. Press the lens down so that it lies between the upper tabs and the
four latches.
e. Assure that the lens is seated tightly against the sides of the tabs
located to the left and right of the upper post.
L-905 - Reassembly
© 3M June 2006. All rights reserved.
f. Assure that the upper and lower posts in the faceshield frame are
inserted in the openings in the lens.
g. Turn the four latches a quarter-turn (all the way against their stops)
to secure the lens in place.
10) To replace the L-130 Wide-view Faceshield:
a. Place the faceshield over the cams on the headgear.
11) To replace the L-153 Welding Shield:
a. Place the welding shield over the cams on the wide view
faceshield.
b. Screw in the knobs on either side of the faceshield.
12) To replace the L-145 Knob:
a. Screw the knob into the cam.
13) To replace the L-125 or L-127 Shrouds:
a. Zip the inner shroud back into the L-127 if it was removed.
b. Hold the headgear upside down.
c. Hold the shroud so the small fabric insert faces toward the rear of
the headgear, to allow grasping of the ratchet knob that adjusts the
size of the suspension.
d. Slide the shroud onto the headgear until the covered metal band is
beyond the lip of the headgear on all sides.
e. Be sure the flap is not tucked underneath the metal band.
f. Pull the flap away from the hook and loop material.
g. Tighten the band clamp with a flat blade screwdriver.
h. Press the flap down onto the hook and loop material.
14) Installing a Shade Glass into the welding shield:
a. Grasp the wire welding lens retainer clip and pull gently in the
direction of the welding shield “chin”.
L-905 - Reassembly
© 3M June 2006. All rights reserved.
b. When the clip is clear of the lens frame slots, lift the clip up and out
of the way.
c. Insert a cover plate into the weld shield.
d. Insert a rubber lens gasket.
e. To prevent glass breakage due to heat buildup, a fiber or plastic
gasket should then be placed between the cover plate and the
glass shade lens.
f. Insert the glass lens into the lens frame, making sure that the cover
plate and lens fits completely inside of the lens gasket. If any of the
edges of the lens gasket are rolled over during the insertion of the
new lens, light leaks may result.
g. Finally, insert an ANSI approved safety plate over the shade glass
lens and re-install the wire retaining clip.
NOTE: Use the lower hinge slots for shade glass lenses and the
upper slots for electronic lens. Be sure the curve of the wire is
towards the lens and that the clip is seated in the two retainer slots.
15) Installing the Electronic Lens into the Welding Shield:
a. Grasp the wire welding lens retainer clip and pull gently in the
direction of the welding shield’s chin.
b. When the clip is clear of the lens frame, lift the clip up and out of
the way.
c. Insert a cover plate into the weld shield.
d. Insert the rubber lens gasket.
NOTE: A fiber gasket is not used with the electronic lens.
e. Insert the electronic lens adapter assembly into the lens frame,
making sure that the cover plate and lens fits completely inside of
the lens gasket. If any of the edges of the lens gasket are rolled
over during the insertion of the new lens, light leaks may result.
f. Re-install the wire retaining clip. Make sure that the retaining clip
seats itself into the two slots at the bottom of the lens opening.
L-905 - Reassembly
© 3M June 2006. All rights reserved.
g. If the wire clip has fallen out, reinstall it so it is curved in the
direction shown. The curve of the lens retainer clip should face the
lens stack. With the thicker electronic lens, the wire retaining clip
prong should go into the upper hinge points of the shield.
h. To secure the lens stack in place, pull the clip down over the stack
until it snaps into the two slots in the lens frame.
NOTE: When using the electronic welding lens, be sure to use the
electronic lens adapter and safety plate supplied with the electronic
lens or light leaks may result.
NOTE: Make sure that the lens retaining clip seats itself completely
into the two slots at the bottom of the lens opening.
NOTE: The safety plate supplied with the electronic lens is part
number 520-02-34R01.
16) When replacing the L-133 Lens Covers, up to five lens covers can be
attached, one on top of another. As needed, you can then peel off the
outermost cover to improve your vision. To replace the lens covers:
a. Peel off the tape and secure one side of the cover to the lens.
b. Smooth the cover carefully across the lens, and secure the other
side
NOTE: Avoid rubbing the lens cover aggressively to adhere it to the
lens. Doing so may impart a static charge which will result in small
particles (dust, paint aerosols, etc.) being attracted to the lens
during use.
c. For best adhesion, be sure the lens is clean. Use warm soapy
water, followed by a clean water rinse and air dry. If needed, use a
solvent such as isopropanol only. Allow the lens to dry completely
before attempting to attach a lens cover.
17) To replace the L-182 Air Deflector:
a. Remove the face shield knobs.
b. Remove the face shield or shields from the headgear.
c. Apply the 4-inch strip of hook and loop fastener to the front of the
headgear shell.
L-905 - Reassembly
© 3M June 2006. All rights reserved.
d. Attach the deflector to the fastener so that the wings on each side
are below the bottom edge of the shell.
e. Be sure there is no interference between the deflector and the
faceshield that would not allow the shield to close completely.
18) To replace the L-183 Headgear Cover:
a. Insert the latch end of the breathing tube in the hole in the back of
the cover. Attach the breathing tube to the headgear.
b. Pull the cover over the top until the elastic covers the top of the
wide-view frame.
c. Reinstall the faceshield or shields.
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