TM 10-4610-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
HIGH-PRESSURE PUMP
INTIAL SETUP
Material/Parts
Seal kit, PN 33985
Valve kit, PN 30982
O-rings, PN 17547, 43893, 26089, 44001
Plunger, PN 46976
GENERAL
This work package lists the common malfunctions that you may find during the operation or maintenance of the
Lightweight Water Purifier (LWP) plunger pump on the high-pressure pump module. 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 (UF) 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
Tighten fittings and hoses. Use thread
Inspect for leaks
tape
Inspect for corrosion and
Replace pump if cavitated or corroded
(0098 00)
1. Low discharge pressure
Worn seals
Install new seal kit. (WP 0125 00)
Worn or dirty inlet/discharge
Clean inlet/discharge valves or install
valves
new valve kit (WP 0125 00)
Install new pulsation dampener (WP
Faulty pulsation dampener
2. Pulsation
Debris trapped in inlet/discharge
Clean inlet/discharge valves or install
valves
new valve kit (WP 0125 00)
Loose filler cap or excessive oil
Tighten filler cap. Ensure oil level is not
in crankcase
higher than the dot on the sight gauge
Loose bubble gauge or worn
Replace gasket (WP 0125 00)
bubble gauge gasket
3. Oil leak
Loose drain plug or worn drain
Replace O-ring (WP 0125 00)
plug O-ring
Worn internal seals
Replace or rebuild pump (WP 0125 00)
4. Premature seal failure
Pump running dry
Do not operate pump dry
Worn hi-pressure or lo-pressure
Install new valve kit. (WP 0125 00).
seals
Worn adapter/spacer O-rings
Replace O-rings
5. Water leak
Humid air condensing into water
Change oil every 3 months or 500
inside the crankcase
hours.
Install new seal kit. Increase frequency
Excessive wear to seals
of service. (WP 0125 00).
0065 00-1
