RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
33
26. Remove bearing cap bolts (601), bearing cap
bolt washers (850), and bearing cap bolt O-ring
(89W) from bearing cap (37) and discard O-ring.
Remove bearing cap (37).
NOTE
If ball bearings and/or oil seals/bearing isolators
are disturbed from position replace with new.
27. If necessary to remove back-to-back ball
bearings (18), remove bearing jam nuts (22)
from shaft (6).
28. Remove back-to-back ball bearings (18) and
bearing frame bearing isolators (169*) with
outboard bearing frame (99) from shaft (6).
Discard bearing frame bearing isolators.
29. Remove bearing spacer (78) from shaft (6).
30. Remove snap ring (176) from shaft (6). Remove
slinger (40X) from sleeve (14X).
NOTE
Refer to mechanical seal vendor instructions for
proper mechanical seal removal procedure.
DO NOT remove rotating element of
mechanical seal (91*) from shaft sleeve (14X)
at this point, especially if mechanical seal is
relatively clean and in good working condition.
31. For cartridge mechanical seals (91*), loosen
setscrews that hold the cartridge seal sleeve to
seal sleeve (14X) and remove cartridge seal.
32. For Type 1 mechanical seals (91*), remove seal
gland (17X).
33. If necessary to replace mechanical seal (91*),
remove stationary element of mechanical seal in
seal gland (17X). Remove gland O-ring (89H)
from seal gland.
34. Remove sleeve (14X) and rotating element of
mechanical seal (91*) from the shaft (6). Inspect
rotating element of mechanical seal. If
replacement is required, remove rotating
element from sleeve.
35. Remove key (32X) from shaft (6).
D. PARTS INSPECTION.
1. All parts should be thoroughly cleaned with a
suitable solvent or replaced with new ones if
necessary.
2. All sealing faces should be perfectly clean. All
ball bearings, mechanical seals, gaskets, O-
rings, oil seals/bearing isolators, and locking
devices with a nylock feature are to be replaced
with new if disturbed from position.
3. Check shaft for runout, scratches, grooves, or
any possible damage. Touch up scratches and
grooves with a polishing cloth and inspect for
remaining grooves or deep scratches. A bent or
excessively damaged shaft should be replaced.
4. Inspect the discharge, interstage and suction
casings for pitting, scoring, and erosion. The
inside of the discharge, interstage and suction
casings should be free of any pits or grooves.
The maximum allowable depth is 1/8” (3mm).
Replace the discharge, interstage or suction
casings if any of these defects are present.
5. Inspect mechanical seal. Replace the
mechanical seal that is disturbed from position
or damaged.
6. Inspect impeller, sleeve, and coupling keys for
distortion and push fit into keyways. The keys
should be square on all four edges. They should
fit without having to be forced. The keys should
not rock in keyway. Replace keys or shaft if
necessary.
7. Inspect tubing for kinking. Replace kinked
tubing.
8. If the impeller shows excessive wear due to
erosion or pitting, so that performance cannot
be restored, it must be replaced. If a new
impeller is installed, check to make sure that it is
balanced and of the correct trim. If an impeller is
restored or replaced, check the dynamic
balance of the rotor before reassembly of the
pump.
9. Check the wear ring clearance as follows:
a. Measure outside diameter of front impeller
hub (2A or 2X) in three places.
b. Measure inside diameter of wear ring (7A)
in three places.
c. If difference between the high reading of the
inside diameter of the wear ring (7A) and
the low reading of the outside diameter of
the impeller (2A or 2X) wear ring exceeds
double the new maximum clearances given
in Table 16, replace the wear ring according
to Section XI, Paragraph G.
d. Measure outside diameter of back impeller
hub (2A or 2X) in three places.
e. Measure inside diameter of the back wear
ring (7X) in three places.
f. If difference between the high reading of the
inside diameter of the back wear ring (7X)
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