Aqua Lung SEA LV2 Technical Manual page 20

20
TABLE 1: TROUBLESHOOTING GUIDE FIRST STAGE
SYMPTOM
System will not remain depressurized after
handwheel is closed and second stage is
purged.
High or Unstable MP "Creep"
Low MP
External Air Leak
POSSIBLE CAUSE
1. The seat & disc retainer (29) is worn or
damaged.
2. The seat & disc retainer crown in first stage
body (8) is worn or damaged.
1. The seat & disc retainer (29) is worn or
damaged.
2. The seat & disc retainer crown in first stage
body (8) is worn or damaged.
3. The spring (7) is weakened or damaged.
4. The HP seat (6) is worn or damaged.
5. The HP crown seating surface in first stage
body (8) is worn or damaged.
1. The spring (7) is weakened or damaged.
1. The piston head o-ring (3) or shaft o-ring
(5) is worn or damaged.
2. The o-ring grooves on the piston (4) are
worn or damaged.
3. The piston head o-ring sealing surface in the
retainer cap (2) is worn or damaged.
4. The piston shaft o-ring sealing surface in
the first stage body (8) is worn or damaged.
5. Safety plug (9) not seated correctly.
SEA MK / LV2 Technical Manual
TREATMENT
1. Replace seat & disc retainer (29).
2. Replace body (8).
1. Replace seat & disc retainer (29).
2. Replace first stage body (8).
3. Replace spring (7).
4. Replace HP seat (6).
5. Replace first stage body (8).
1. Replace spring (7).
1. Replace o-rings (3 & 5).
2. Replace piston (4) and o-rings (3 & 5).
3. Replace retainer cap (2).
4. Replace first stage body (8).
5. Check for damage and re-torque safety
plug (9).