ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
HIGH PRESSURE PUMPS
PISTON BODY
PISTON BODY OUTER O-RING
PISTON
PISTON O-RING
Figure 35. High Pressure Pump Piston Installation.
20. Inspect and (if necessary) replace the valve housing.
a. Inspect the valve housing for any cracks, delamination or damage. Replace the valve-
housing assembly if any delamination or obvious damage is visible.
NOTE
The valve housing contains pairs of disk check valves above each piston to rectify
the flow through the pump. All valves must be properly seated and properly
oriented. The failure of a valve will drastically affect the performance of the pump.
b. The top surface of the valves should be flush with the surface of the valve housing.
c. Inspect the exposed surfaces of the valves for damage and / or wear.
21. Check for bad valves by performing the following water hold test:
a. Hold the valve housing up off the surface of the work area.
b. Pour water only into the valves with the plastic ends.
c. If water flows through any of the valves and out the bottom, replace the valve as
described earlier in this work package in the 1000 hour PMCS.
d. Flip the valve housing over and repeat the water hold test for the valves with the plastic
ends showing on the other side of the housing.
NOTE
Alignment pins on the piston body help align the valve housing to the body.
22. Mount the valve housing onto the piston body (see Figure 36):
PISTON BODY
VALVE HOUSING
PISTON BODY
ALIGNMENT PIN
Figure 36. Valve Housing Installation.
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