e. Place slings around the shaft near the bearing
housings and lift rotating element from lower casing
(1A). Tap lightly on the underside of the bearing
housings (31 and 33) to separate the housing from the
brackets.
f. Place rotating element in a convenient work place.
1-3.
ROTATING ELEMENT.
Remove the plugs and
drain oil from the oil lubricated bearings. Remove
constant level oilers (125) and pipe nipples.) (Not
required for grease lubricated bearings.) Proceed as
follows.
a. Loosen set screw and remove the coupling half. Tap
from the back of the hub or use a puller. Remove
coupling key (46).
b. Loosen set screws on the water deflector (40A).
c. Remove cap screws or stud nuts from bearing covers
(35) and separate covers from housing (31) and (33).
(Use care not to damage the oil seal (107)) used with oil
lubricated bearings.)
d. Lightly tap around housings (31,33) to remove. Do not
cock or force housing off, as to do so may damage the
bearings (16,18), or the oil seal (107).
e. Loosen and remove bearing locknut (22) and
lockwasher (69A).
f. Remove bearings as described in Figure No. 3.
g. Carefully remove shaft collars (68) (if present) and
bearing covers (35). Use care not to damage cover
gasket (73B) or oil seal (107).
NOTE
Clearance between collar and shaft is approximately
0.002 inch. Use care when removing not to cock or
force, as this will score the shaft.
h. Withdraw casing rings (7, 7A). On most pumps these
may be withdrawn before removing the coupling half.
i. Remove water deflector (40), packing (13), lantern
rings (29) and stuffing box bushings (63). Make note of
the number of packing rings on each side of the lantern
rings.
j. Loosen the shaft sleeve (14) set screws near impeller
hub. With a spanner wrench, turn the inboard sleeve in
the same direction as shaft rotation to remove (shaft has
right-and left-hand threads on opposite sides of
impeller).
NOTE
A seal between the shaft and sleeves is made with a
2-1.
INSPECTION.
Visually inspect parts for damage affecting
serviceability or sealing. Emphasize inspection of mating parts
having relative motion – wear rings, for example. Perform
detail inspection as follows:
a. Check O-rings and bearing cover gaskets for cracks, nicks
or tears; packing rings for excessive compression, fraying or
shredding, embedded particles (dirt or metal). Replace if
defective in any way.
b. Mount the shaft between lathe centers. Check the
eccentricity throughout entire length with a dial indicator to be
not more than 0.003 inch total indicator reading. Check that the
threads are clean and sharp. Surfaces on which bearings
mount must be smooth, have a finish not
less than 32 micro-inches, and have shoulders square
and free from nicks.
c. Measure the OD of the integral impeller wear surfaces
rubber O-ring in a groove in the sleeve. Use care not to
damage the O-ring.
k. Support the back side of first stage impeller (2) with a
split ring on the base of a suitable arbor press. Shift the
inter-stage bushing (113) toward second (third) stage
impeller (2) so that support ring bears on impeller close
to shaft (6). Carefully press shaft through impeller (2).
l. Take off inter-stage bushing (113) and remove impeller
key (32).
m. Similarly support second stage impeller (2) with split
ring, press shaft through impeller and remove key (32).
Remove casing ring (7).
n. Support third stage impeller (2) in same manner,
press shaft through inter-stage sleeve (58A) and
impeller, then remove key (32).
o. Press shaft through inter-stage sleeve (58).
1-4.
CLEANING.
Clean all metal parts (except bearings)
with a solvent. Use a bristle brush (NOT metal or wire) to
remove tightly adhering deposits. A fiber scraper may be
used to remove the gasket and shellac from casing
flanges.
a. Blow dry with clean dry compressed air.
b. Clean bearings as described in 1-5.
1-5.
CLEANING BEARINGS.
a. Remove bearings from the housings, referring to
disassembly instructions.
b. Place bearings in a wire basket to there is space for
the cleaning solvent to reach all parts.
c. Immerse the basket in Stoddard solvent or equivalent,
agitating the basket until grease is thoroughly loosened
and can be flushed out.
d. Place bearing on a screened surface.
e. Using a spray gun with air filter and clean Stoddard
solvent, flush each bearing until all grease and sludge is
removed.
f. Blow solvent out of bearings with dry filtered air.
g. Lubricate bearings immediately after cleaning with
light spindle oil and place them in a covered container.
h. Do not spin bearings any time during cleaning.
SECTION II
INSPECTION AND REPAIR
and the ID of the casing rings (7 and 7A). Compute the
diametrical clearance (ID minus OD) and compare with the
limits given in Figure 5. ID surface of casing ring must be
smooth and concentric. For pumps equipped with impeller
rings, clearances should not exceed two times the maximum
amount shown for pump type in Figure No. 5.
d. Measure OD of inter stage sleeve (58) and ID of inter-stage
bushing (113). Compute diametrical clearance and compare
with limits given in Figure 6. ID surface of inter-stage bushing
must be smooth and concentric. Sleeve lands must be free
from burrs and flat spots.
e. Examine impeller passages for cracks, dents, gouges or
embedded material.
f. Check upper and lower casing machined surfaces to be free
from burrs or nicks.
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