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Table 2 - Second-Stage Troubleshooting Guide
SYMPTOM
Free Flow
Hard to breathe
Restricted air flow or high inhala-
tion resistance through entire
system
Hissing sound from second-
stage
Water entering second-stage
POSSIBLE CAUSE
1. Purge button (2) jammed open
2. Lever (20) set to high
3. Lever (20) bent
4. Ice deposits on demand valve
5. First-stage intermediate pressure set too
high
1. Lever (20) bent
2. Lever set too low
3. First-stage intermediate pressure set too
low
5. First-stage filter (9) clogged
1. Cylinder valve not completely open
2. Cylinder valve needs service
3. Filter (9) is clogged
1. Lever (20) set too hight
2. First-stage intermediate pressure set too
high
3. Low pressure seat (13) damaged or worn 3. Replace low pressure seat
4. HP leak
5. Inlet fitting (11) damaged
6. Purge flow adjustment screw (2) out too
far
1. Hole in mouthpiece (24)
2. Pinhole in diaphragm (8)
3. Damamged exhaust valve (10)
4. Second-stage diaphragm (8) improperly
clamped between box top (4) and box
bottom (16)
5. Exhaust valve seating area damaged
TREATMENT
1. Remove purge button
2. Turn locknut counterclockwise to
adjust lever downward
3. Replace lever
4. Allow water to flow in to melt ice
5. Readjust IP to 140±5 psig
1. Replace lever
2. Turn locknut clockwise to adjust
lever upward
4. Readjust IP to 140±5 psig
5. Replace filter
1. Open valve; check fill pressure
2. Switch to different cylinder
3. Replace filter
1. Turn locknut counterclockwise to
adjust lever downward
2. Readjust IP to 140±5 psig
4. Overhaul first-stage
5. Replace inlet fitting
6. Turn screw clockwise ¹⁄₂ turn at a
time and retest
1. Replace mouthpiece
2. Replace diaphragm
3. Replace exhaust valve
4. Disassemble and reassemble cor-
rectly
5. Replace box bottom (16)
15
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