25
C. WET BREATHING:
POSSIBLE CAUSE
RECOMMENDED ACTION
Diaphragm improperly installed or hole in
diaphragm
Damaged or loose fitting exhaust valve
Crack in housing (10)
Worn venturi lever O-rings (15, 27)
Scratched or worn venturi lever
sealing surfaces
Scratched or worn housing (10)
sealing surfaces
Improper clearing techniques by diver
Extremely slow breathing allowing water
to build up in housing rather than being
blown out
Check position of diaphragm visually.
Replace if holes found by holding up to a light.
Replace exhaust valve (14)
Replace housing
Replace O-rings (15, 27)
Replace venturi lever (16)
Replace housing
Instruct diver on clearing techniques
Explain this result of slow breathing to diver.
D. HIGH FREQUENCY HUMMING OR BUZZING DURING INHALATION:
POSSIBLE CAUSE
RECOMMENDED ACTION
Remove the main spring (7) flip it over
and re-install.
Replace spring or other components
until resonance stops.
Harmonic resonance between the springs
and other 1st stage components.
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E. LOW FREQUENCY FLUTTERING DURING INHALATION (Above the surface only):
POSSIBLE CAUSE
RECOMMENDED ACTION
Remove, rotate and re-install diaphragm or switch
diaphragm with another.
Replace seating seal (22)
Remove, rotate and re-install spring (25)
Explain to the customer that this is not harmful to
the regulator, and does not happen underwater.
Move venturi lever (16) towards “-” position until
harmonic resonance stops.
Harmonic resonance between the springs
and other 2nd stage components.
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