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