ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
AIR SYSTEM, HIGH PRESSURE
Replace Pressure Switch Assembly PSL/PSH-901 as follows:
WARNING
The TWPS must be in Shutdown and the TQG and TWPS main breaker must be off
(Army) or the TWPS disconnected from its power source (Marine Corps) prior to
performing maintenance on the TWPS Air System. Failure to observe this warning
can result in injury to personnel and damage to equipment.
High pressure. The air system contains air pressure up to 1800 psig. The air
system must be bled prior to performing maintenance on components of the air
system. Failure to observe this warning can result in injury to personnel and
damage to equipment.
1. Make sure the air system has been bled down. Refer to ENTIRE AIR SYSTEM BLEED DOWN.
2. Remove the pressure switch assembly as follows (see Figure 5):
a. Remove the terminal box cover and remove the two screws that secure the control wires.
b. Unscrew the ring nut from the terminal box connection and pull the control wire out.
c. Loosen the nut on the ferrule of the air hose compression fitting and remove the air hose.
d. Remove the three bolts, six washers, and three nuts that secure the pressure switch
assembly to the TWPS and remove the pressure switch assembly.
e. Remove the elbow ferrule from the assembly.
NUT AND WASHER
RING NUT
CONTROL WIRES
ELBOW FERRULE
NUT
TERMINAL
BOX COVER
AIR HOSE
BOLT AND WASHER
PRESSURE SWITCH ASSEMBLY
PSL/PSH-901
Figure 5. Pressure Switch Assembly PSL/PSH-901 Replacement.
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