TM 10-4610-310-14
DIRECT SUPPORT/GENERAL SUPPORT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
HIGH-PRESSURE PUMP
GENERAL
This work package lists the common malfunctions that you may find during the direct support/general support
troubleshooting of the Lightweight Water Purifier (LWP) high-pressure plunger pump assembly. You should
perform the tests/inspections and corrective action in the order listed. This pump contains three stainless steel
valves to pressurize the fluid system from the Ultrafiltration module for entry into the Reverse Osmosis (RO)
element module.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
MALFUNCTION
TEST/INSPECTION
CORRECTIVE ACTION
Disassemble pump and inspect
Replace if worn or corroded (WP
for worn or corroded internal
1. Low pressure
components. WP 0125 00.
Severe cavitation
Check inlet condtions
Foreign material trapped in
Clean inlet/discharge valves.
2. Pulsation
inlet/discharge valves
Install new valve kit (WP 0125
3. Water leak
Worn high-pressure or low
Install new seal kit. Increase
a. Manifold
pressure seals
frequency of service (WP 0125
Excessive wear to seals
Install new seal kit. Increase
b. Into the crankcase
frequency of service (WP 0125
Broken or worn bearing
Replace bearing (WP 0125 00)
4. Knocking noise
Restricted inlet or air entering
Correct restricted plumbing.
the inlet plumbing
Check for air tight seal
5. Pump runs rough
a. Inlet conditions
b. Pump valves
Stuck inlet/discharge valves
Clean out foreign material or
install new valve kit (WP 0125
Scored plungers
Replace plungers (WP 0125 00)
Excessive pressure and/or
Check pressure and inlet
6. Premature seal failure
temperature of pumped liquid
pressure temperature
Eroded manifold
Replace manifold. (WP 0125
END OF WORK PACKAGE
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