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 (2)
Position casing wearing ring over impeller
b. Removal.
wearing ring and check for clearance. If clearance exceeds
(1)
Disconnect external wiring from motor
.010 inch, replace wearing rings.
connection box, and mark for assembly.
(3)
To remove impeller wearing ring, heat surface of
(2)
Loosen motor mounting bolts and disconnect
ring to expand it. Do not heat impeller. Pry wearing ring from
coupling between motor and pump.
impeller.
(3)
Remove mounting bolts, and lift motor
(4)
Inspect the surface of the shaft sleeves for
foundation.
scoring. Replace scored sleeves.
c. Disassembly. The disassembly of this motor is the
(5)
Remove all old grease from ball bearings with
same as that discussed in paragraph 5-34 c.
clean fuel oil and wipe dry. Spin each bearing while holding in
d. Cleaning and Inspection. The cleaning and inspection
hand. Bearings that sound rough while spinning will be
of the motor is the same as that discussed in paragraph 5-34
replaced.
d.
(6)
Replace impeller wearing ring by heating,
e. Assembly. The assembly of this motor is the same as
positioning on impeller, and allowing to cool.
that discussed in paragraph 5-34 e.
g. Assembly.
f. Installation.
(1)
Make sure impeller is positioned on pump shaft
(1)
Position motor on foundation.
with key in place. Grease shaft and slide pump sleeves into
(2)
Install mounting bolts. Do not tighten.
position.
(3)
Align coupling; assembly, and bolt together.
(2)
Replace packing gland (8) and casing wearing
(4)
Tighten foundation bolts.
rings (13) on each end of shaft, and replace sleeve locknut
(5)
Connect electrical wiring to motor connection
(6). Tighten shaft sleeve against impeller.
box.
(3)
Replace bearings on each end of shaft and lock
in place with bearing locknut.
5-38. Controller
(4)
Position bearings in bearing housing (1) and
The maintenance on controller is the same as that discussed
replace bearing housing cap (3} and cover (4).
(5)
Position wearing rings (13) in lower casing half,
and replace upper casing half. Bolt casing halves together.
5-39. Fresh and Salt Water Standby Pump
(6)
Fabricate new packing rings and replace in
a. General. The fresh and salt water standby pumps are
stuffing box. Position three rings of packing, cage ring (15),
identical in construction and in the maintenance section are
and then three more rings of packing.
treated as one unit. Both the fresh water and salt water
pumps circulate water through the propulsion engine heat
NOTE
exchanger or engine to cool the engine, to provide additional
Cut the package by wrapping rings
circulating water if necessary, or to provide entire cooling
around the shaft and cut, allowing a gap
should either or both pumps on the engine be cut out of
of 1/4 inch between packing ends.
service. The pump is driven by a 7.5-hp, 115-volt dc motor.
Stagger ends of packing when replacing.
The pump is a single stage centrifugal pump having a 4-inch
suction inlet and a 3-inch discharge outlet. The pump is fitted
(7)
To adjust packing, turn shaft by hand and
with two ball bearings, one of which is the thrust bearing.
tighten packing gland slowly and evenly. Tighten only enough
Both bearings are positioned on the same side of the impeller.
to commence seating packing.
An adjustable packing gland is installed in the pump housing
h. Installation. Reverse the order of removal and then
to prevent excessive leakage around the pump shaft.
adjust packing in accordance with b above.
b. Maintenance and Adjustment.
The pump packing
gland must leak slowly when the pump is running to provide
5-37. Motor
lubrication between shaft and pump packing. Should the
a. Maintenance and Adjustment (TM 55-506).
packing leak excessively, leakage may be slowed by
(1)
Lubricate in accordance with LO 55-1925-204-
tightening the packing gland nuts while the pump is running.
12.
Tighten only enough to bring the leakage to a slow drip. Do
(2)
Inspect brushes. Replace brushes worn to one-
not stop the leakage entirely.
half normal length.
Sand new brushes to contour of
c. Removal.
commutator.
(1)
Disconnect suction and discharge lines from
(3)
Check brush spring tension. Adjust tension to 1
pump (fig. 5-76).
3/4 to 2 1/2 psi at contact surface.
.
(4)
Check brushes to see that they move freely in
holders.
(5)
Keep commutator clean.
5-101
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