35
E. WET BREATHING:
POSSIBLE CAUSE
RECOMMENDED ACTION
F. HIGH FREQUENCY HUMMING OR BUZZING DURING INHALATION (1st stage issue):
POSSIBLE CAUSE
RECOMMENDED ACTION
Remove the main spring flip it over and
re-install.
Replace spring or other components
until resonance stops.
Harmonic resonance between the springs
and other 1st stage components.
“ “
G. 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 (13)
Remove, rotate and re-install spring (23)
Explain to the customer that this is not harmful to
the regulator, and does not happen underwater.
Harmonic resonance between the springs
and other 2nd stage components.
“ “
“ “
“ “
Diaphragm improperly installed or hole in
diaphragm
Damaged or loose fitting exhaust valve
Crack in housing (25)
Kinked Flat Gasket (38)
Scratched or worn housing (25)
sealing surfaces
Improper clearing techniques by diver
Extremely slow or upsidedown breath-
ing, 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 (40)
Replace housing
Re-position or Replace Flat Gasket (38)
Replace Housing (25)
Instruct diver on clearing techniques
Explain this result of upsidedown or slow
breathing to diver.
