SERVICE CHEMICAL FIRE EXTINGUISHER (M1059A3 ONLY) Continued
Check nameplates (1) for legibility and security. If nameplate is loose, remove and examine mounting area on shell (2)
Pull cartridge guard (3) from extinguisher (4). Inspect the inside components for working order and cleanliness.
Unscrew cartridge (5) left hand thread (counterclockwise). Check seal (6) for punctures.
A cartridge can be punctured if the lever does not work freely. Do not install the cartridge
before you make sure the puncture lever works freely.
Weigh cartridge (5). If weight is less than 1/2 oz. of weight stamped on cartridge, the cartridge must be replaced. Use
5-pound mail and parcel post scale.