Motor-To-Pump Shaft Alignment; Rotation; Operation; Maintenance - Xylem NPE Instruction Manual

4. DISCHARGE PIPING:
4.1. Arrangement must include a check valve located
between a gate valve and the pump. The gate
valve is for regulation of capacity, or for inspection
of the pump or check valve.
4.2. If an increaser is required, place between check
valve and pump.
4.3. Use 3-4 wraps of Teflon tape to seal threaded con-
nections.

5. MOTOR-TO-PUMP SHAFT ALIGNMENT:

5.1. Close-Coupled Units
5.1.1. No field alignment necessary.
5.2. Frame-Mounted Units
5.2.1. Even though the pump-motor unit may have
a factory alignment, this could be disturbed
in transit and must be checked prior to run-
ning. See Figure 6.
Figure 6
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 paral-
lel but not concentric. Place dial indicator
on one hub and rotate this hub 360 degrees
while taking readings on the outside diam-
eter of the other hub. Parallel alignment
occurs when Total Indicator Reading is .005"
(.13mm), or less.
5.2.5. Angular misalignment - shafts with axis
concentric but not parallel. Place dial indi-
cator on one hub and rotate this hub 360
degrees while taking readings on the face of
the other hub. Angular alignment is achieved
when Total Indicator Reading is .005"
(.13mm), 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 motor: Non-reversible.
Parallel
Angular
6.1.2. Three-phase motor: Interchange any two
power supply 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.
Pumped liquid provides lubrication.
CAUTION
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 op-
erating conditions and temperature 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 Unit. Ball bearings are located in
and are part of the motor. They are permanently
lubricated. No greasing required.
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 manufacturers'
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.
Proceed only as far as required to perform the mainte-
nance 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. Remove impeller locknut (304).
Do not insert screwdriver between
CAUTION
impeller vanes to prevent rotation of
close-coupled units. Remove cap at opposite end
of motor. A screwdriver slot or a pair of flats will be
exposed. Using them will prevent impeller damage.
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