ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
REVERSE OSMOSIS SYSTEM
RO Feed Pump P-4 Repair:
Parts (TM 10-4610-309-24P):
Seal Kit
Shaft Sleeve
Wear Ring
Materials:
Solvent (WP 0079, Table 1, item 19)
Glycerin (BII) (WP 0079, Table 1, item 21)
Sealing compound (WP 0079, Table 1, item 35)
Antiseizing tape (WP 0079, Table 1, item 43)
Clean, dry rags (WP 0079, Table 1, item 33)
Equipment Condition:
TWPS in Standby Shutdown With Drain-Down
Army: Generator off and TWPS main breaker off
Marine Corps: TWPS disconnected from power source
Repair RO Feed Pump P-4 (including inspecting and replacing the pump seal, shaft sleeve, and wear
ring) 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
removing or installing the RO feed pump. Failure to observe this warning can
result in injury or death from electrocution or damage to equipment.
1. Make sure the TWPS is in Standby Shutdown With Drain-Down.
2. Remove the pump/motor assembly from the TWPS skid. Refer to REPLACE and RO Feed
Pump P-4 Pump/ Motor Assembly Replacement.
3. Remove the pump from the adapter as follows (see Figure 20):
a. Remove the eight cap screws that hold the pump casing to the adapter and pull the
casing off.
b. Remove and discard the pump casing gasket.
c. Unscrew the street elbow with the drain valve and hose from the pump drain port.
NOTE
It may be necessary to hold the impeller using a strap wrench or a pipe wrench to
keep it from turning while loosening the screw with a socket wrench. If the screw
is corroded onto the impeller, it may be necessary to apply corrosion preventive
compound where the screw and impeller meet.
d.
Remove the impeller screw.
e.
Remove and discard the screw gasket.
f.
Carefully pry the impeller off of the shaft.
g.
Remove the spring.
h.
Remove the impeller key.
i.
Pull the shaft sleeve with the seal off the shaft.
j.
Lift the pump cover off the adapter. If required, carefully pry the cover off the adapter.
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