ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0048 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
RAW WATER SYSTEM
5. Set the gap between the impeller and the pump wear plate as follows (see Figure 16):
a. Remove the four cap screws and four lock washers that secure the outlet flange to the
pump housing.
b. Carefully remove the pump flange to avoid damaging the gasket between the flange and
the pump housing.
c. If the gasket is damaged, replace it.
d. Look through the outlet into the pump. Turn the impeller drive sleeve and impeller by
hand until you see the impeller near the wear plate.
e. Insert a 0.015 inch feeler gauge between the impeller and wear plate. Move the
impeller forward or backward as needed to provide a gap of 0.015 to 0.017-inch.
f. Make sure the coupling clamp set screw, a drive sleeve slat, and the motor shaft keyway
are aligned.
g. Tighten the coupling clamp assembly to secure the impeller drive sleeve to the
engine/motor drive shaft.
h. Turn the drive shaft slowly to rotate the impeller and make sure that there is a minimum
gap of 00.015-inch through the entire rotation of the impeller as follows:
1) Turn the diesel engine (P-1) drive shaft by slowly pulling on the hand starter.
2) Turn the electric motor (P-2) drive shaft by hand.
i. Torque the coupling clamp nuts to 216 in.-lbs.
j. Tighten the coupling clamp set screw into the drive shaft keyway.
CAP SCREW
LOCK WASHER
WEAR PLATE
OUTLET FLANGE
IMPELLER
OUTLET FLANGE GASKET
PUMP HOUSING
FEELER GAUGE
Figure 16. Pump Impeller Clearance Adjustment.
6. Complete the installation as follows:
a. Apply sealing compound to the threads of the remaining four threaded studs extending
from the pump housing through the adapter (WP 0079, Table 1, item 25). Install the nuts
onto the studs.
b. Remove the two nuts initially installed onto opposing studs. Apply sealing compound to
the stud threads and reinstall the nuts (WP 0079, Table 1, item 25).
c. Reinstall the pump outlet flange and gasket.
7. Connect the motor cable to the proper receptacle on the junction box.
8. Mount the fuel tank assembly on the skid frame and connect the fuel tank and diesel engine fuel
supply and return lines.
9. Place the pump back into service and check it for leaks and proper operation.
0048 00-22
