3M 7800 User Manual

7800 - Disassembly
© 3M June 2006. All rights reserved.
3M™ Full Facepiece 7800
Disassembly
Let’s begin with the facepiece.
1) To prepare the full facepiece for use with the GVP:
a. Remove the 701 Cartridge Inlets from either side of the facepiece.
b. Install a 7890 Plug into each inlet. The plugs should be replaced
when they are dirty or damaged.
c. Remove the 7890 Plug from the front DIN port.
2) To prepare the full facepiece for use with the Dual Airline:
a. Remove the 7890 Plugs, if it is not already fitted with a 701
Adapter. The 701 adapter allows you to attach the dual airline
breathing tube to the 7800 full facepiece.
b. Thread the assembled 701 adapters with the orange gaskets facing
outward into the cartridge connector port – do not tighten.
c. Install a 7890 Plug into the front DIN port.
3) The 7993 is the Welding Shroud, the 7915 is the Tyvek® Shroud.
The shrouds should be replaced when they are damaged, frayed or torn.
To remove the shroud:
a. Pull it up and over the facepiece, pulling the material from around
the DIN port and side ports when needed.
Tyvek is a registered trademark of E.I. DuPont Company.
4) The 7894 is the Standard Eyeglass Frame. Replace the frame when it
is damaged. To remove the it:
a. Lift the frame kit out of the inside of the facepiece.
b. An alternative frame is the 7925 Universal Frame Kit. It should be
replaced when it is damaged.

3M 7800 Specifications

General

Connection Type	Bayonet
Primary Material	Silicone
Standards/Approvals	NIOSH Approved
Adjustable Straps	Yes
Exhalation Valve	Yes
Product Type	Respirator
Size	Medium
Filter Compatibility	Bayonet Style Cartridges

Summary

Prepare Facepiece for GVP Setup

Remove 701 Cartridge Inlets and Install 7890 Plugs

Steps to prepare facepiece by removing inlets and installing plugs.

Prepare Facepiece for Dual Airline Setup

Remove 7890 Plugs and Attach 701 Adapters

Steps to fit facepiece for dual airline breathing tube.

Install 7890 Plug into Front DIN Port

Procedure to install the plug into the front DIN port.

Shroud and Eyeglass Frame Removal

Remove Welding or Tyvek Shroud

Instructions on how to remove damaged welding or Tyvek shrouds.

Remove Standard Eyeglass Frame

Steps to lift out the eyeglass frame kit.

Facepiece Plug and Cartridge Adapter Disassembly

Remove Facepiece Plug (7890)

Procedure to remove the facepiece plug depending on setup.

Remove Bayonet Cartridge Adapter (701)

Steps to remove the bayonet cartridge adapter.

Valve and Gasket Disassembly

Remove Inhalation Valve Gasket (7887)

Procedure to remove the inhalation valve gasket.

Remove Air Inlet Gasket (7999)

Procedure to remove the air inlet gasket.

Remove Exhalation Valve Cover (7918)

Steps to lift and slide off the exhalation valve cover.

Remove Exhalation Valve (7283)

Procedure to grasp and pull out the exhalation valve.

Other Component Disassembly

Remove Band Clamp (7914)

Steps to untighten screw and remove the band clamp.

Remove Nose Cup Assemblies (7881/7981)

Procedure to pull away nose cup assemblies and remove valve.

Remove Breathing Room Assembly (7916)

Steps to remove breathing room by twisting.

Remove Speaking Diaphragm Kit (7895)

Procedure to remove diaphragm retaining ring and diaphragm.

Remove Inhalation Valve (7282)

Steps to lift the inhalation valve from its seat.

Head Strap and Lens Disassembly

Remove Head Strap Assembly (7893S)

Steps to push buckle away and remove head strap.

Remove Lens (7884)

Procedure to loosen screws, remove frames, and lens.