19
MTX-R 2nd Stage Maintenance Manual
SYMPTOM POSSIBLE CAUSE TREATMENT
Leakage or freeow
from Second Stage
1. Excessively high rst-stage intermediate
pressure.
1. Refer to rst-stage Troubleshooting
Guide.
2. Silicone Valve Seat (21) damaged or
worn.
2. Replace Silicone Seating.
3. Seat (16) adjusted incorrectly, Lever (19)
set too high.
3. Reset Seat preliminary settings, and
repeat Adjustment Procedures.
4. Lever (19) bent. 4. Replace Lever.
5. Seat (16) sealing surface damaged. 5. Replace Valve Seat.
6. Valve Spring (24) damaged. 6. Replace Spring.
7. Shuttle Valve ‘O’ Ring (23) damaged. 7. Replace ‘O’ Ring.
8. Counter Balance Cylinder (25) bore
damaged.
8. Replace Counter Balance Cylinder.
Low purge or
excessive work
of breathing (full
cylinder)
1. Low rst-stage intermediate pressure.
1. Refer to rst-stage Troubleshooting
Guide.
2. Seat (16) adjusted incorrectly, Lever (19)
set too low.
2. Reset Seat preliminary settings, and
repeat Adjustment Procedures.
3. Intermediate pressure hose clogged or
obstructed.
3. Clean or replace Hose.
4. Lever (19) bent or catching on Valve
Spindle (17).
4. Replace Lever.
5. Spindle Collar (18) incorrectly positioned
on Valve Spindle (17).
5. Rotate Spindle Collar to correct
position.
Water entering
Second Stage or
Vacuum test failure
1. Mouthpiece (8) damaged or incorrectly
tted.
1. Replace or re-t Mouthpiece as
appropriate.
2. Diaphragm (4) damaged. 2. Replace Diaphragm.
3. Diaphragm (4) improperly seated in Case
(6).
3. Remove Front Cover (2) and Diaphragm
Cover (3) properly reassemble
Diaphragm (check for distortion).
4. Exhaust Valve (29) damaged. 4. Replace Exhaust Valve.
5. Case (6) damaged. (Check exhaust valve
seating surface.)
5. Disassemble and replace Case.
6. Heat exchanger (9) or Spindle (17) ‘O’
Ring (10) damaged.
6. Replace ‘O’ Ring.
7. Venturi Lever assembly or Blanking Piece
(11) ‘O’ Ring (12) damaged.
7. Replace ‘O’ Ring.
Table 1 - Troubleshooting Guide
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