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 TM 55-1925-204-12
NOTE
NOTE
Do not tighten packing gland until pump
When replacing sleeve on the shaft it
is running. Tightening the gland without
may be necessary to heat the sleeve to
running the pump may seize the packing
slide it into position on the shaft.
against the shaft sleeve and cause the
(4) Inspect wearing ring on the impeller by placing
sleeve to become grooved and worn.
impeller in casing. and check the side play clearance between
wearing ring and wearing ring recess in pump casing.
f. Installation.
Clearance should not exceed .055- to .010-inch total side
(1) Replace pump coupling half on shaft.
play.
(2) Position pump on pump foundation using the same
(5) If wearing ring requires replacement, remove ring by
shims between pump and foundation.
heating surface of ring and driving from impeller.
If
necessary, drill a hole in surface of wearing ring and remove
NOTE
ring by breaking in half.
If a new pump is being installed it will be
necessary to realign the entire pump.
NOTE
Be careful not to damage the impeller
(3) Check pump alignment by making sure coupling
when removing the wearing ring.
halves meet squarely and on the same plane.
(4) Replace bolts holding pump to pump foundation.
(6) Replace by heating the new ring: position on
and again check pump alignment.
impeller. The new ring will secure itself when it shrinks during
(5) Connect coupling halves and replace suction and
cooling.
discharge lines.
e. Assembly.
(6) Adjust packing with pump running and pumping
(1) Pack thrust and inner bearing with grease in
water. Tighten gland until only a slow drip appears around
accordance with lubrication order and replace in pump frame.
shaft. Do not stop leakage entirely .
(2) Position pump shaft in pump frame: replace inner
bearing lock and packing gland on shaft, but do not tighten
5-33. Priming Pump
bearing lock setscrew.
a. General. To prime a centrifugal pump located above
(3) Replace back head on pump frame and tighten
its source of supply necessitates removal of air from pump
capscrews (7).
casing and suction line to draw water up to the pump.
(4) Align impeller on shaft key and slide impeller into
Therefore, a priming pump is installed on the suction line of
place. Replace impeller screw.
bilge and ballast pump. The priming pump is a water sealed
(5) Replace pump casing and tighten capscrews (6).
centrifugal type pump which gets its priming water from the
(6) Check pump by rotating the shaft to make sure it
sanitary system. The pump is belt-driven from the bilge and
rotates freely. If free, position bearing locks and secure in
ballast motor. The priming pump is mounted on its own
place.
foundation above the motor.
(7) Replace packing by inserting two packing rings, seal
b. Removal.
cage (16), and then three packing rings. Replace packing
(1) Remove bolts which hold pump to the foundation.
gland.
(2) lip belt off end of pump.
c. Disassembly.
(1) Remove four nuts (4, fig. 5-70) from bolts holding
lobe (8) to body and port plate.
Change 1
5-92
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