TM 5-4320-218-15
Section XIX. PUMP ASSEMBLY
pump volute (15).
j. Slide the pump volute (15) away from the
a. Remove the pump discharge manifold
engine and remove from the trailer.
k. Unscrew the impeller (7) from the end
b. Remove the check valve (par. 127).
of the shaft. Remove the impeller ring (8).
c. Remove the instrument panel (par. 131).
l. Remove the spacer sleeve (6) and seal as-
d. Remove the pump air eliminator and suc-
sembly (5).
tion manifold (pars. 132a and 133a).
e. Remove the nuts (10) and lockwashers
m. Remove the cap screws (2) and lockwash-
(11) and remove the discharge elbow (9) and
ers (1) and remove the intermediate (3).
gasket (12).
137. Maintenance and Repair of Pump
f. Remove the adapter (18).
g. Insert a piece of soft metal (heavy gage
The construction of the pump is such that
sheet aluminum) through the top of the volute
little maintenance is required. The two main
(15) and between the sides of the impeller and
points requiring service are the shaft seal as-
between any two ribs. The piece of soft metal
sembly (5, fig. 39) and the wear ring (8).
must be long enough to rest against the volute
138. Reassembly of Pump
opening. Turn the crankshaft sharply counter-
clockwise to break the contact between the
a. Reassemble the pump in the opposite or-
thread in the impeller and the thread on the
der of disassembly (par. 136).
crankshaft. If the edges of the impeller ribs are
b. Firmly and squarely install stationary
chipped or damaged the impeller will be
parts in bore.
thrown out of balance. To correct this condi-
c. Oil the sleeve spacer (6) ; place rotating
tion it will be necessary to file the edges of
seal assembly (5) with the end of the seal sur-
the impeller ribs so all are alike.
face flush with the end of the sleeve.
h. Remove the nuts (22), lockwashers (23)
and cap screws (24) securing the base of the
d. Place sleeve on the shaft and push sleeve
through seal until sleeve butts against the
pump volute (15) to the trailer.
shoulder on the shaft. Insert the spring and
i. Remove the nuts (27) and lockwashers
(26) securing the intermediate (3) and the
install the impeller.