ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0057 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
CHEMICAL INJECTION SYSTEM
Chemical Injection Pump Repair / Pump Head Assembly:
Parts:
Pump Head Assembly (TM 10-4610-309-24P)
Material:
Five gallon bucket
Equipment Condition:
TWPS Electrical Power "ON" initially and "OFF" when specified
Replace the pump head assembly on a chemical injection pump as follows:
1. Remove the pump head assembly from the chemical injection pump as follows (see Figure 9):
a. Depressurize the discharge tubing and drain and flush the chemical injection pump as
described in the Chemical Injection Pump Replacement procedure earlier in this WP.
b. Place the TWPS in Standby Shutdown without draining down, including switching the
main circuit breaker on the power distribution panel (PDP) to OFF (WP 0017).
c. Remove the discharge, return, and suction tubes from the pump.
d. Remove the 4 screws, washers, and nuts that secure the pump to the mounting base and
reposition the pump as desired for easy access to the pump head assembly.
e. Remove the four-function valve, flat washer, discharge cartridge valve, and O-ring from
the top of the pump head.
f. Remove the suction valve housing, flat washer, suction cartridge valve, and O-ring from
the bottom of the head.
g. Remove the four bolts and washers that secure the pump head to the chemical injection
pump drive assembly and remove the pump head assembly.
O-RING
DISCHARGE
TUBING
SUCTION
CARTRIDGE
PUMP HEAD
FOUR-FUNCTION
VALVE
ASSEMBLY
VALVE
FLAT WASHER
SUCTION
VALVE
DRIVE
HOUSING
RETURN
ASSEMBLY
TUBING
BOLT AND
SUCTION
WASHER (4)
FLAT WASHER
TUBING
PUMP
DISCHARGE
DIAPHRAGM
CARTRIDGE
VALVE
O-RING
Figure 9. Pump Head Removed from Chemical Injection Pump.
2. Inspect the condition of the pump diaphragm before installing the new pump head assembly.
Make sure the pump diaphragm is properly positioned with the spacer as shown in Figure 10. If
the diaphragm is damaged or improperly positioned, replace or reposition the diaphragm. Refer
to the Chemical Injection Pump Repair / Pump Diaphragm procedure that follows this
procedure.
0057 00-12
