ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
CHEMICAL INJECTION SYSTEM
NOTE
Each chemical pump power cable has a dedicated circuit that is controlled by the
PLC (Programmable Logic Controller) in the PDP. Each pump power cable must
be wired to it's specific circuit in order for the pump to operate as controlled by the
PLC. Do not mix the wiring.
d. Trace the power cable from the pump to be replaced to the terminal box.
e. Tag and disconnect the three wires for the chemical pump to be replaced from the other
wires in the terminal box.
f. Unscrew the lock nut from the terminal box and pull out the cable strain relief and cable.
CAUTION
Do NOT use a pliers or pipe wrench on coupling nuts or fittings. Failure to observe
this caution could result in stripping the threads on the nuts or fittings.
g.
Tag and disconnect the discharge tubing from the four-function valve.
h.
Tag and disconnect the suction tubing from the pump.
i.
Tag and disconnect the return tubing from the four-function valve.
j.
Remove the four bolts, nuts, and washers that secure the chemical injection pump to the
TWPS and slide the pump out from its mounting.
SPEED KNOB
DISCHARGE
TUBING
FOUR-FUNCTION
VALVE
RETURN TUBING
CABLE
SUCTION TUBING
BOLT, NUT, AND WASHER
STRAIN
RELIEF
CHEMICAL PUMP TERMINAL BOX
GASKET
COVER
TIE-DOWN
LOCK NUT
STRAP
CONDUCTOR SPLICES
Figure 3. Chemical Pump Replacement.
0057 00-4
