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 COMPRESSOR
Third Stage Valve Head Assembly Replacement:
Parts (TM 10-4610-309-24P):
Third Stage Valve Head Assembly
Materials:
Corrosion preventive compound (WP 0079, Table 1, item 12)
Adhesive, silicone (WP 0079, Table 1, item 1)
Equipment Condition:
TWPS in Standby Shutdown Without Draining Down
Army TWPS: Generator off and TWPS main breaker off
Marine Corps TWPS: TWPS disconnected from power source
WARNING
Equipment tag-out procedures are required. The TWPS unit must be properly
tagged out prior to performing maintenance. Failure to observe this warning could
result in injury to personnel and damage to equipment.
High pressure. The air system contains air pressure up to 1800 psig. The high
pressure air system must be bled prior to removing the third stage valve head
assembly. Failure to observe this warning can result in injury to personnel and
damage to equipment.
Replace the third stage valve head assembly as follows:
1. Make sure that electrical power to the TWPS has been shut off.
2. Make sure the high-pressure air system has been bled down. Refer to High-Pressure Air
System Bleed Down Procedures.
3. Remove the third stage valve head assembly as follows (see Figure 11):
a. Remove the tubing between the third stage head assembly and the intermediate filter.
b. Disconnect the intercooler tube from the third stage valve head assembly.
c. Remove and discard the dome nut and gasket. Unscrew the setscrew three or four turns.
d. Remove the six socket head cap screws that secure the valve head to the piston cylinder.
e. Remove the valve head cover and the valve head together.
f. Unscrew the temperature switch off the valve head.
g. Cover the piston cylinder to prevent dirt from entering the cylinder.
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