Check nameplates (1) for legibility and securi-
ty. If nameplate is loose, remove and
examine mounting area on shell (2) for
Pull cartridge guard (3) from extinguisher (4).
Inspect the inside components for working or-
der and cleanliness.
Unscrew cartridge (5) left hand thread (coun-
terclockwise). Check seal (6) for punctures.
A cartridge can be punc-
tured if the lever does not
work freely. Do not install
the cartridge before you
make sure the puncture
lever works freely.
9. 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.
nozzle (7) from holder
from behind puncture
(8) and lift
puncture lever (10) to check for
proper working order.
Check the pressure relief vent (11) for ob-
Remove cartridge receiver gasket (12) and
check for cuts or wear. If damaged, replace.