3M SCOTT AIR-PAK X3 PRO, Operating & Maintenance Instructions, Page: 26 / 84

INSPECTING THE RESPIRATOR
10 P/N 595373-01 Rev C 202004
Inspecting the Regulator
Inspection of the regulator includes checking the regulator gasket, purge valve, Heads-Up Display (HUD), regulator
hose, and quick-disconnect.
To inspect the regulator
1 Verify that the purge valve (red knob) is not damaged and turns smoothly one-half turn from stop to stop. See
Figure 2-5
2 Verify that the regulator gasket is not damaged and is in place around the outlet port of the regulator. See
Figure 2-5 .
Figure 2-5 Inspecting the regulator
3 Inspect the HUD for damage. Verify that the rubber guard is in place and is not torn or damaged.
4 If the hose to the breathing regulator is equipped with a quick-disconnect, inspect both the male and female
quick-disconnects. Pay special attention to the following:
a Inspect the operation of the locking sleeve on the female
quick-disconnect. If any damage is noted, remove it from
service and tag it for repair.
b Inspect the condition of the male quick-disconnect. Look for
signs of wear on the locking ridge as shown in Figure 2-6 .
Figure 2-6 Inspecting the male quick-disconnect
NOTE
Do not use tools to open or close the purge valve. Using tools to open or close the purge valve may result in
damage to the valve. Instead, open or close the valve using finger pressure only. Rotation of the purge valve
is limited to one-half turn.
Purge knob
Regulator
gasket
E-Z Flo + (on AV-3000 HT) E-Z Flo C5 (on Vision C5)
Look for wear on
the locking ridge
Auto air-saver
switch /
Regulator latch