Xylem IM009 R02 Model 3657/3757 - Manual (Page 5)

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5.2.2. Tighten all hold-down bolts before checking
the alignment.
5.2.3. If re-alignment is necessary, always move the
motor. Shim as required.
5.2.4. Parallel misalignment - shafts with axis parallel
but not concentric. Place dial indicator on one hub
and rotate this hub 360° while taking readings on the
outside diameter of the other hub. Parallel alignment
occurs when Total Indicator Reading is .005", or less.
5.2.5. Angular misalignment – shafts with axis con-
centric but not parallel. Place dial indicator on one
hub and rotate this hub 360° while taking readings
on the face of the other hub. Angular alignment is
achieved when Total Indicator Reading is .005", or
less.
5.2.6. Final alignment is achieved when parallel and
angular requirements are satisfied with motor hold-
down bolts tight.
CAUTION: ALWAYS RECHECK BOTH
ALIGNMENTS AFTER MAKING
ANY ADJUSTMENT.
6. Rotation:
6.1. Correct rotation is right-hand (clockwise when
viewed from the motor end). Switch power on and
off quickly. Observe shaft rotation. To change rota-
tion:
6.1.1. Single-phase: Refer to wiring diagram on mo-
tor.
6.1.2. Three-phase: Interchange any two power sup-
ply leads.
7. Operation:
7.1. Before starting, pump must be primed (free of air
and suction pipe full of liquid) and discharge valve
partially open.
CAUTION: PUMPED LIQUID PROVIDES
LUBRICATION. IF PUMP IS RUN DRY,
ROTATING PARTS WILL SEIZE AND
MECHANICAL SEAL WILL BE
DAMAGED. DO NOT OPERATE AT
OR NEAR ZERO FLOW. ENERGY
IMPARTED TO THE LIQUID IS
CONVERTED INTO HEAT. LIQUID
MAY FLASH TO VAPOR. ROTATING
PARTS REQUIRE LIQUID TO PREVENT
SCORING OR SEIZING.
7.2. Make complete check after unit is run under operat-
ing conditions and temperatures has stabilized. Check
for expansion of piping. On frame-mounted units
coupling alignment may have changed due to the
temperature differential between pump and motor.
Recheck alignment.
8. Maintenance:
8.1. Close-Coupled Units: Bearings are located in and are
part of the motor. For lubrication procedure, refer to
motor manufacturer’s instructions.
8.2. Frame-Mounted Units:
8.2.1. Bearing frame should be regreased every 2,000
hours or 3 month interval, whichever occurs first.
Use a #2 sodium or lithium based grease. Fill until
grease comes out of relief fittings, or lip seals, then
wipe off excess.
8.2.2. Follow motor and coupling manufacturer’s
lubrication instructions.
8.2.3. Alignment must be rechecked after any main-
tenance work involving any disturbance of the unit.
9. Disassembly:
Complete disassembly of the unit will be described. Pro-
ceed only as far as required to perform the maintenance
work needed.
9.1. Turn off power.
9.2. Drain system. Flush if necessary.
9.3. Close-Coupled Units: Remove motor hold-down
bolts.
Frame-Mounted Units: Remove coupling, spacer, cou-
pling guard and frame hold-down bolts.
9.4. Disassembly of Liquid End:
9.4.1. Remove casing bolts (370).
9.4.2. Remove back pull-out assembly from casing
(100).
9.4.3. Unscrew impeller nut (304) with a socket
wrench.
CAUTION: DO NOT INSERT SCREWDRIVER
BETWEEN IMPELLER VANES TO
PREVENT ROTATION.
It may be necessary to use a strap wrench around
the impeller if impacting the socket wrench will not
loosen the impeller bolt. Hold the shaft on frame
mounted units.
9.4.4. Use two pry bars, 180° apart, to remove im-
peller (101) from shaft.
9.4.5. Remove impeller key (178) and seal spring.
9.4.6. With two pry bars 180° apart inserted through
the windows of the motor adapter (108), pry on the
end of the shaft sleeve (126). The mechanical seal
rotary unit (383) will come off with the sleeve.
9.4.7. Remove the seal housing to adapter bolts
(370H). Remove seal housing (184) together with
stationary seal parts.
9.4.8. Place seal housing on flat surface and press out
stationary seal parts.
9.5. Disassembly of bearing frame:
9.5.1. Remove bolts (370C) and bearing cover (134).
Slide V-ring deflector (123) off shaft.
9.5.2. Remove shaft assembly from frame (228).
9.5.3. Remove lip seals (333A) from bearing frame
and bearing cover if worn and are being replaced.
9.5.4. Straighten tang in lockwasher (382). Remove
locknut (136) and lockwasher.
9.5.5. Use bearing puller or arbor press to remove
ball bearings (112 & 168).