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
6. Install a new seal kit (seal, stationary seat, seat gasket, and spring) and shaft sleeve as follows
(see Figure 22):
a. Clean the sleeve, pump cover bore, and pump shaft thoroughly with solvent, and dry with
a clean cloth.
NOTE
Do not use grease to lubricate the sleeve and mechanical seal parts. Grease will
prevent the seal from setting and result in leakage around the shaft.
Once the seal is placed onto the sleeve, the rest of the assembly must be
completed without delay to ensure that the seal sets properly.
b. Lightly lubricate the bore of the new pump cover with glycerin.
c. Press the stationary seat gasket and then the stationary seat into the bore so they are
seated firmly and squarely.
d. Lightly lubricate the new seal with glycerin and slide it onto the new sleeve with the
carbon side facing the small end of the sleeve. Complete the rest of the assembly
without delay.
e. Slide the new pump cover with the stationary seat over the shaft. Avoid bumping the
seat as you slide it over the shaft.
f. Position the pump cover so that the internal bypass hole in the cover is between the 1
and 2 o'clock position.
g. Tap the cover with a rubber mallet if necessary to seat the cover securely.
h. Insert the new sleeve O-ring into the I.D. of the sleeve if it is not already in place.
i. Lubricate the I.D. of the sleeve and the O.D. (outer diameter) of the shaft with glycerin.
j. Slide the sleeve with the seal onto the shaft with the small end of the sleeve going onto
the shaft first. Push the sleeve all the way onto the shaft.
k. Align the shaft and sleeve keyways.
l. Position the key with the thick end of the key toward the motor and the flat back of the
key against the motor shaft.
m. Insert the key in the keyway.
n. Discard the seal spring retainer and place the new spring over the end of the sleeve and
over the seal assembly.
o. Slide the impeller onto the shaft over the key.
p. Place sealant on the impeller screw threads.
q. Place the impeller screw gasket onto the impeller.
r. Push down on the impeller and thread the impeller screw into the end of the shaft.
s. Tighten the impeller screw.
t. Check the freedom of the rotating parts by hand-rotating the impeller. If the impeller rubs
against the pump cover, try tapping the cover down again with the rubber mallet to seat
the cover on the adapter.
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