ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
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TROUBLESHOOTING PROCEDURES
OPERATOR/CREW TROUBLESHOOTING PROCEDURES
Table 9. General Air System Troubleshooting - Continued.
ITEM
MALFUNCTION
POSSIBLE CAUSES
CORRECTIVE ACTION
1
Leaking air piping or hoses
Bleed the entire air system (WP 0042) then
cont
remove the leaking fitting, replace the
thread tape and re-install. Replace leaking
hose (WP 0045).
Leaking tubing or connections inside the
Open the instrument panel outer and inner
Instrument Panel.
doors. Check for leaks. Repair as needed.
Leaking solenoid valve XV-901 (in Air
Stop the air compressor. Feel each of the
System Section 3), XV-902 (in Air System
three solenoid valves. If vibrating, it may be
Section 4), or XV-903 (in Air System
leaking. Notify Unit Maintenance.
Section 3).
Air compressor safety valve on the second
Feel for air flow from the safety valve on top
stage head is relieving.
of the second stage head with the
compressor on. If flow is noted, Notify Unit
Maintenance to replace all three
compressor valve assemblies.
Leaking air compressor valves.
Notify Unit Maintenance.
2
Air system pressure
Defective pressure gauge PI-902.
Open V-910 to bleed system air pressure.
regulation pressure gauge PI-
If the gauge reading does not move, or
902 is reading less than 90
does not return to zero, Notify Unit
psig. Pressure gauge PI-901
Maintenance to replace the gauge .
readings are normal.
Pressure Regulating Valve PRV-901 (in
Adjust the pressure regulating valve to
Air System Section 1) out of adjustment or
provide a100 psig reading at PI-902
malfunctioning.
replace PRV-901 if unable to correct.
3
Pressure gauge PI-903
Defective pressure gauge PI-903.
Open V-910 to bleed system air pressure.
pressure reading is not 15
If the gauge reading does not move, or
psig.
does not return to zero, Notify Unit
Maintenance to replace the gauge.
Pressure regulating valve PRV-902 out of
Adjust pressure-regulating valve PRV-902
adjustment.
to provide a 15 psig reading at PI-903
replace PRV-902 If unable to correct.
4
Compressor stops below 950
Defective pressure gauge PI-901.
Open V-910 to bleed system air pressure.
psig. Compressor switch
If the gauge reading does not move, or
light is OFF.
does not return to zero, Notify Unit
Maintenance to replace the gauge.
Pressure Switch PSL/PSH-901 high-
Adjust Pressure Switch PSL/PSH-901 high-
pressure shut-off setting out of
pressure shut-off setting (WP 0042).
adjustment.
5
At startup, air pressure
Air Receiver Tank Outlet Valve V-907
Open Air Receiver Tank Outlet Valve
increases quickly and
closed.
V-907.
compressor cycles on/off.
6
At first start-up or start-up
Filter not installed or not pushed down to
Stop the air compressor. Open High
after replacing Air Purification
seat the O-ring.
Pressure Air Vent Valve V-904 to release
Filter AF-2, severe air leak
the pressure. Remove the AF-2 filter cover.
noise is heard at the bottom
Install filter if missing (WP 0042). Make
of the filter.
sure the filter is pushed down and you feel
a definite engagement of the O-ring.
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