SECTION III – REASSEMBLY
Figure 7. Vane Position for Proper Rotation
3-1.
ROTATING ELEMENT.
(See Figure 7 or 8).
Reassemble as follows:
a. Coat shaft (6) lightly with oil. Re-oil as necessary while
pressing on impellers and sleeves.
b. Install 3/16 square key in shaft. With grooves, square
shoulder side, facing toward the highest number stage,
press interstage sleeve (58) on outboard end of shaft,
locating centrally between first two key slots. Slide
interstage bushing (113) over sleeve.
Figure 8. Assembly Relationship of Interstage Sleeve (58)
c. Insert key (32), align third (or second) stage impeller
(2B) and press on inboard end of shaft to contact inter-
stage sleeve.
d. Press on interstage sleeve (58A) to contact third stage
impeller. Located casing ring (7) on third stage impeller
ring (8).
e. In turn, insert remaining keys (32), align second
and/or first stage impellers (2A, 2) and press on shaft.
Carefully bump parts to remove all clearance and so that
first and second stage impeller hubs extend equally
beyond central portion of shaft (slightly into threaded
portions).
f. Install O-rings in shaft sleeves (14), coat ring and
shaft with oil and screw sleeves on shaft against
impeller hubs.
g. Install the stuffing box bushing (63) and lantern ring
(29) on the shaft.
h. Locate casing rings (7) on impeller.
i. Place water deflectors (40) on shaft.
j. Slide bearing covers (35) (with oil seals (107)
installed for oil lubricated bearings) on the shaft.
k. Place shaft collars (68) on the shaft.
l. Mount the bearings (16) and (18) as described in Figure
3. The outboard bearings are two single row angular
contact bearings mounted in the duplex DB mounting.
m. Install bearing lockwasher (69A) and locknut (22) (oil
thrower) and tighten against the outboard bearing.
n. Install gaskets (73B) on bearing covers. Cut replace-ment
gaskets from 1/16 inch No. 444 Vellumoid. Apply cement
(i.e. Permatex No. 2) to bearing cover gaskets when
bearings are water-cooled.
o. Slide the housings (31, 33) over the bearings. Tap lightly
and evenly around the end as necessary. Do not force.
p. Attack the bearing covers (35). In the assembled position,
the grease fittings or breather tubes must be located on top.
q. Locate water deflector (40) and tighten the setscrews.
Install oil seal (107) in the inboard bearing housing (31) (for
oil lubricated bearings).
r. Install coupling key; assemble coupling half on the shaft
and tighten the setscrew.
s. Check run out of the interstage sleeves on assembled
rotor. Maximum run out must not exceed .006 TIR.
3-2.
PUMP.
Complete the assembly of pump as follows:
a. Use the upper casing (1B) as a template to cut a gasket
(73A) from 1/64 inch Vellumoid. Machined surfaces of both
casings must be perfectly clean and free from burrs and
nicks.
b. Affix the new gasket to lower casing (1A) with shellac.
c. Use slings around the shaft near bearings to set rotating
element into lower casing. Position the casing rings (7, 7A),
and both bearing housings so that all dowel pins engage. If
necessary, loosen setscrews of water and grease deflectors
to shift bearing housings slightly. Retighten screws.
d. Assemble both bearing caps (41) and tighten the cap
screws.
e. If impellers are not (approximately) centered in volute or
impellers are not allowing case rings to seat in casing, adjust
shaft sleeves by loosening one and tightening the other in
direction required. Tighten setscrews in sleeve after final
adjustment is made. Recheck run out of inter-stage sleeves.
If run out exceeds. 006 TIR, do not proceed until
problem is corrected.
f. Cover the topside of the casing gasket with a mixture of
graphite and oil. Install the gland bolts (17B). Carefully
locate the upper casing on the lower, making certain the
dowel pins engage. Attach case nuts and alternately tighten
at diagonally opposite positions. See Torque Chart, Table II.
Rotate shaft by hand to check that it runs free.
g. Withdraw the lantern rings (29) and push the bushings
(63) to the rear of the stuffing boxes. Insert the same
number of packing rings as were found during disassembly
on each side of the lantern ring. Insert each ring separately
and stagger the joints of successive rings 90 degrees. Insert
the glands (17) and set the nuts tight –
DO NOT USE A
WRENCH.
h. Rotate shaft by hand to check that it runs free.
i. Replace all drain plugs removed during disassembly.
3-3.Reinstall plumbing (if used) for water-cooled bearing.
a. Relubricate the bearings. Refer to Bulletin No. 2880549
for grease type recommendation. It is most important to
provide proper lubrication and keep bearings clean. Fre-
quency of lubrication must be determined by experience as it
depends upon bearing size, speed, operating conditions and
location (environment). Table III should be used as
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