User manual
59
12.4.3 HARNESS
Replacing a belt buckle
There are two belt buckles - one on the left and one on the right. When a hip belt is correctly positioned, the
free ends of the belt will be on the outside of the hip belt to facilitate easy tightening.
1
. Make sure that the outward-bent parts of the buckles are facing away from the user (“the outside”). Pull
the hip belt from the inside through the slot nearest the buckle.
2
. Thread the belt through the second slot from the outside of the buckle.
3. Make sure that the belt has not become kinked.
12.4.4 BREATHING VALVE
Replacing a protective ring
1. Lift the protective ring over the anges one at a time until the ring comes away. Lift the protective ring
over a ange by pressing it together slightly and then carefully lift it over the ange.
2
. Installing a new ring: The ribbed edge of the protective ring must be facing away from the diaphragm
bracket. Place the protective ring over the two or three wing anges and press the ring down over the
remaining anges.
Replace O-ring (only full-face mask)
The O-ring is located in the breathing valve's bayonet coupling.
WARNING!: This O-ring must not be installed in a breathing valve with a mouthpiece as it can subsequently
cause the mouthpiece to come loose.
1. Remove the breathing valve from the full-face mask.
2. Where necessary, remove the old O-ring. Press the old O-ring out using your thumb and index nger. Do
not use sharp objects as these can damage the O-ring groove.
3. Place a new O-ring in the groove.
Check that the O-ring is correctly positioned and has not become twisted.
Replacing a mouthpiece
1. Loosen the hose clamps, keeping the mouthpiece in place using a screwdriver. Loosen the hose clamp
until it is released from the wide groove in the mouthpiece.
2. Install a new mouthpiece and clamp it in the breathing valve. Place the clamping screw in the area between
the diaphragm bracket and the mouthpiece.
3. Tighten the clamping screw with sufcient force. Check that the hose clamp is correctly positioned by
holding the valve housing and pulling the mouthpiece.
4. Connect the breathing hose to the breathing valve and tighten the connecting nipple by hand.