Apeks XL4 SECOND STAGE Technical Maintenance Manual page 14

14
TABLE 1: TROUBLESHOOTING GUIDE
SYMPTOM
Second Stage Air
Leak or Free Flow
Low Purge or
Labored Breathing
on Full Cylinder
Water Entering
Second Stage
POSSIBLE CAUSE
1. Extremely high MP from first stage
2. The MP seat (17) is damaged
3. The seat (14) was adjusted incorrectly
or lever (15) is set too high
4. The lever (15) is bent
5. The seat (14) sealing surface is damaged 5. Replace valve seat
6. The valve spring (20) is damaged
7. Shuttle valve o-ring (19) is damaged 7. Replace o-ring
8. Shuttle valve (18) is damaged
9. Venturi lever o-ring (11) is damaged
1. First stage has low MP
2. Seat (14) adjusted incorrectly or
lever (15) is set too high
3. The MP hose is clogged or obstructed
4. The lever (15) is bent or catching on
the valve spindle (16)
1. Mouthpiece (9) incorrectly fitted
2. The diaphragm (6) is damaged
3. The diaphragm (6) is improperly
seated in case (7)
4. The exhaust valve (25) is damaged
5. The case (7) is damaged
6. Heat exchanger o-ring (11) is damaged 6. Replace o-ring
7. Venturi body o-ring (11) is damaged
NOTE: This is a partial list of possible problems and recommended treat-
ments. For more information, contact Aqua Lung's Technical Services De-
partment for assistance with problems not described here.
CAUTION: Recommended treatments which require disassembly of
the regulator must be performed during a complete overhaul, accord-
ing to the prescribed procedures for scheduled, annual service. Do
not attempt to perform partial service.
TREATMENT
1. Refer to First Stage Troubleshooting Guide
2. Replace the MP seat
3. Reset seat preliminary settings & re-
peat adjustment procedures
4. Replace lever
6. Replace valve spring
8. Replace Shutle valve
9. Replace o-ring
1. Refer to First Stage Troubleshooting Guide
2. Reset seat preliminary settings &
repeat adjustment procedures
3. Clean or replace the MP hose
4. Replace lever
1. Refit or replace mouthpiece
2. Replace diaphragm
3. Remove front cover assembly &
re-seat diaphragm properly
4. Replace exhaust valve
5. Replace case
7. Replace o-ring