Xylem IM014 Model SST-C and Model SST-F - Manual (Page 2)

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III. Alignment:
A. No field alignment is necessary on close-coupled pumps.
B. Even though the pump-motor unit may have a factory
alignment, in transit this alignment could be disturbed and
must be checked prior to running.
C. Check the tightness of all hold-down bolts before checking
the alignment.
D. If re-alignment is necessary, always move the motor. Shim
as required.
E. Final alignment is achieved when parallel and angular
requirements are achieved with both pump and motor hold-
down bolts tight. Caution: Always recheck both alignments
after making adjustments.
F. Parallel misalignment exists when the shafts are not concen-
tric. Place dial indicator on one hub and rotate this hub 360º
while taking readings on the outside diameter of the other
hub. Parallel alignment occurs when Total Indicator Reading
is .005" or less.
G. Angular misalignment exists when the shafts are not parallel.
Place dial indicator on one hub and rotate this hub 360º
while taking readings on the face of the other hub. Angular
alignment is achieved when Total Indicator Reading is .005"
or less.
IV. Suction Piping:
A. Low static lift and short, direct suction piping is desired. For
suction lift over 15 feet, consult pump performance curve for
Net Positive Suction Head Required.
B. Suction pipe size must be at least equal to suction connec-
tion of pump.
C. If larger pipe is used, an eccentric pipe reducer (with straight
side up) must be used at the pump.
D. Installation with pump below source of supply:
1. Install isolation valve in piping for inspection and
maintenance.
2. Do not use suction isolation valve to throttle pump!
E. Installation with pump above source of supply:
1. To avoid air pockets, no part of piping should be higher
than pump suction connection. Slope piping upwards
from liquid source.
2. All joints must be airtight.
3. Foot valve to be used only if necessary for priming, or to
hold prime on intermittent service.
4. Suction strainer open area must be at least triple the
pipe area.
F. Size of inlet from liquid source, and minimum submergence
over inlet, must be sufficient to prevent air entering pump.
V. Discharge Piping:
A. Arrangement must include a check valve located between a
gate valve and the pump. The gate valve is for regulation of
capacity, or inspection of pump or check valve.
B. If reducer is required, place between check valve and pump.
VI. Rotation:
A. Pumps are right-hand rotation (Clockwise when viewed from
the driver end). Switch power on and off. Observe shaft
rotation. On frame-mounted units, check rotation before
coupling pump to motor.
B. Single-Phase: Refer to wiring diagram on motor if rotation
must be changed.
C. Three-Phase: Interchange any two power supply leads to
change rotation.
VII. Operation:
A. 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.
B. Make complete check after unit is run under operating
conditions and temperature has stabilized. Check for
expansion of piping. Check coupling alignment.
C. 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.
VIII. Maintenance:
A. Bearings are located in and are part of the motor. For
lubrication procedure, refer to manufacturer’s instructions.
B. On frame-mounted units, regrease at 2,000 hours use or 3
months. Use #2 Sodium or Lithium grease and fill until
grease comes out of the relief fitting.
IX. Disassembly:
A. Turn power off.
B. Drain system. Flush if necessary.
C. Remove motor hold-down bolts on close-coupled or
disconnect coupling and remove spacer.
D. Remove casing bolts and pump hold-down bolts.
E. Remove motor and rotating element from casing.
F. Unscrew impeller bolt with a socket wrench. 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.
G. Remove impeller washer.
H. Insert two pry bars (180º apart) between impeller and seal
housing. Pry off impeller.
I. Remove seal spring, cupwasher and impeller key.
J. Remove seal housing, pulling with it the rotating seal parts.
(Pry bar slots provided where necessary.)
K. Place seal housing on flat surface. Press out stationary
seal parts.
L. Remove deflector from shaft on frame-mounted units.
M.Remove bolts holding bearing cover to frame and remove
bearing cover (frame-mount).
N. Remove lip seals from bearing frame and bearing cover
(frame-mount).