3M 7800 Installation instructions

7800 - Reassembly
© 3M June 2006. All rights reserved.
3M™ Full Facepiece 7800
Reassembly
Now we will review reassembly and replacement of the 3M™ Full Facepiece
7800.
1) If the 7886 DIN Connector must be replaced, contact 3M Technical
Service at 1-800-243-4630.
2) To replace the Inhalation Valve:
a. Install new valves onto the posts inside the DIN Connector on the
facepiece.
b. Be certain the valves are fully engaged under all 3 lugs on the post,
lay flat and spin on the post.
3) To replace the 7916 Breathing Room:
a. Insert the breathing room into the front opening in the faceseal until
it is flush around the perimeter of the breathing room.
4) To replace the 7914 Band Clamp:
a. Place the clamp on the faceseal, holding the breathing room.
b. Tighten the screw on the clamp with a Phillips head screwdriver.
5) To replace the 7895 Speaking Diaphragm:
a. Push the diaphragm into the opening of the breathing room from
inside the facepiece.
b. Use the diaphragm removal tool to turn the retaining ring clockwise.
c. Ensure the grill pattern with deep indentation in the center is visible
from the inside of the respirator.
6) To replace the 7999 Air Inlet Gasket:
a. Position the gasket so the small cut out on the gasket is pointing
toward the lens.
b. Push the gasket groove onto the plastic bar and seat the gasket.

7800 - Reassembly
© 3M June 2006. All rights reserved.
7) To replace the 7283 Exhalation Valve:
a. Push the valve onto the exhalation valve post.
8) To replace the 7918 Exhalation Valve Cover:
a. Insert the valve cover in the DIN port and push up until it clicks in
place.
9) To replace the inhalation valve gaskets:
a. Insert the gaskets inside the DIN port and push down to seat
properly.
10) To replace the 7890 Plugs (if the facepiece is being used with the
GVP System):
a. Install the plugs into the side air inlets and turn clockwise until tight.
11) To replace the 701 Bayonet Adapters (when the facepiece is set up for
the dual airline supplied air system):
a. Insert the adapters into the side air inlets.
b. Turn clockwise until tight.
c. If you are installing new gaskets on the 701 Adapters be certain
that they are in the proper position under all 3 bayonet lugs.
12) To replace the 7884 Lens:
a. First align the center of the lens with the centerline of the facepiece.
b. The center of the lens is marked with two small lines, one at the top
and one at the bottom.
c. Place the lens into the faceseal. Be certain there is a continuous
seal all around the lens.
13) Reattach the lens frame:
a. Place the lens frame, top and bottom, around the lens.
b. Replace the two center screws and tighten.

7800 - Reassembly
© 3M June 2006. All rights reserved.
14) To replace the 7882 Nose Cup Valve Assembly:
a. Insert the valve assembly into the nose cup with the valve
positioned on the inside of the nose cup.
15) To replace the Nose Cup Assembly:
a. Slide it over the groove around the speaking diaphragm and over
the exhalation valve.
b. Verify that the nose cup is in the groove in the valve assembly.
16) To replace the 7893S Head Strap Assembly:
a. Ensure the harness is positioned correctly with the 3M Logo in the
upright position.
b. Position the opening in the head harness buckle over the faceseal
post.
c. Slide the buckle downward to engage it.
d. To ensure proper fit, make sure all of the buckles are attached
firmly.
17) To replace the 7894 Standard Eyeglass Frame:
a. Insert the two prongs of the eyeglass frame into the holes of the
frame holder with the prongs directed away from the bow of the
frame holder.
b. The eyeglass frame and the bow of the frame holder should be in
the same plane.
c. Position the frame assembly into the facepiece with the bow
immediately on the inside of the inner faceseal.
d. The eyeglass frame should be positioned in the center of the
facepiece lens.
e. Adjust the frame assembly or eyeglass frame as needed to the best
fit.
f. The 7925 Universal Eyeglass Frame is also available.

7800 - Reassembly
© 3M June 2006. All rights reserved.
18) To replace the shrouds:
a. Pull the shroud onto the facepiece such that the side ports, DIN,
and lens are positioned in the proper openings on the shroud.