Changing The Cylinder; Removing The Cylinder; Attaching The Cylinder - MSA G1 SCBA Operating Manual

12.4 Changing the Cylinder

12.4.1 Removing the Cylinder

(1) Put the backplate of the SCBA on a horizontal surface with the cylinder facing up.
(2) Turn the handwheel clockwise to close the cylinder valve.
(3) Turn the regulator bypass knob counterclockwise to open the regulator bypass valve, or if
equipped, push the purge button, until airflow from the regulator stops.
(4) Turn the regulator bypass knob clockwise to close the regulator bypass valve.
(5) Disconnect the handwheel from the cylinder valve assembly.
• Threaded connect
a) Remove the handwheel coupling nut from the cylinder valve assembly.
• Quick connect
a) Turn the quick-connect fitting counterclockwise until it stops, and pull it away from the cylinder
valve assembly to release it.
WARNING!
The cylinder band will snap open quickly when the latch is released. Make sure your hands are not
between the latch and the band when this occurs.
Failure to obey this warning can result in serious injury.
(6) Push the two side buttons on the cylinder band latch and lift to release the cylinder band from
the cylinder.
(7) Remove the empty cylinder from the carrier.

12.4.2 Attaching the Cylinder

WARNING!
Make sure to protect the quick-connect fitting and adapter from damage, dirt, and debris during
cylinder replacement. Dirt and debris can cause the cylinder connection seals to leak. Failure to obey
this warning can result in serious injury or death.
(1) Put the backplate of the SCBA on a horizontal surface with the cylinder facing up.
(2) Make sure the cylinder band latch is open and the band is set for the correct cylinder size.
(3) Install the fully charged cylinder into the carrier with the gauge of the cylinder valve assembly
facing away from the backplate.
(4) Align the regulator retainer into the dovetail (if equipped).
(5) Make sure the cylinder band and latch are in the correct slot. Slot orientation starts from the edge
of the cylinder band label.
Cylinder Band Diameter
H30
H45 (lite)
H45 (carbon)
L30
Slots
3, 4
7, 8, 9
11, 12, 13
12, 13
G1 SCBA 2018 Edition
Cylinders
US
70