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6. Operation
6.1. Before starting, pump must be primed (free of air and
suction pipe full of liquid) and discharge valve partially
open. Plugs are provided in the casing and valve so pump/
suction piping can be filled and/or vented/drained in any
pump orientation.
6.2. Make complete check after unit is run under operating
conditions and temperature has stabilized. Check for
expansion of piping.
7. Maintenance
7.1. Ball bearings are located in and are part of the motor.
They are permanently lubricated. No greasing required.
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.
8. Disassembly
Complete disassembly of the unit will be described. Proceed
only as far as required to perform the maintenance work
required.
8.1. Turn off power.
8.2. Drain system and flush if necessary.
8.3. Disassembly of Liquid-End:
8.3.1. Remove casing bolts (XXX).
8.3.2. Remove motor and remaining Liquid-End
assembly from casing (still connected to piping)
and position vertically for easier disassembly.
8.3.3. Remove impeller locknut (XXX) and washer
(XXX).
CAUTION
Do not insert screwdriver between 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.
8.3.4. Remove impeller by pulling axially.
8.3.5. Remove coverplate (XXX).
8.3.6. Remove shaft sleeve (XXX).
8.3.7. Remove Interstage (XXX).
8.3.8. Repeat steps 8.3.4 through 8.3.7 for three stage
pumps.
8.3.9. Remove last impeller (XXX).
8.3.10. Remove last coverplate (XXX).
8.3.11. Remove seal retainer (XXX).
8.3.12. Remove shaft extension using a screwdriver in
the slot or flats in the back of the motor to
prevent rotation and a wrench to turn extension.
8.3.13. Pry off the rotating element of the mechanical
seal (XXX) from the motor shaft by using two
(2) regular screw drivers 180º apart and using
the motor adapter inner boss as a fulcrum point
and then prying seal up.
8.3.14. Remove the motor adapter bolts (XXX), washers
(XXX) and o-rings (XXX).
8.3.15. Remove the motor adapter.
8.3.16. Remove the stationery element of the mechanical
seal by pushing it out from the motor side with a
blunt instrument. Do not use the blunt
instrument to hit the person next to you over the
head because they think they could have taken
the pump apart faster or easier without ruining
the seal.
9. Reassembly
9.1. All parts should be cleaned before assembly.
9.2. Refer to parts list to identify required replacement items.
Specify pump index or catalog number when ordering
parts.
9.3. Reassembly is the reverse of disassembly.
9.4. Observe the following when reassembling the liquid-end:
9.4.1. All mechanical seal components must be in
good condition or leakage may result.
Replacement of complete seal assembly, whenever
seal has been removed, is good standard practice. It
is permissible to use a light lubricant, such as
glycerin, to facilitate assembly. Do not contaminate
the mechanical seal faces with lubricant.
9.4.2. Inspect the o-rings (XXX) and replace if damaged.
The o-rings may be lubricated with petroleum jelly
to ease assembly.
9.4.3. Inspect impellers (XXX) for wear, degradation or
blockage. Clean or replace as necessary.
9.4.4. Inspect iron parts for excessive corrosion or
degradation. Replace as necessary.
9.4.5. Inspect stainless steel components for excessive
wear or degradation and replace as necessary.
9.4.6. Wear rings contained in the interstage(s) and
casing would need to be pressed or pried out and
pressed in should they need replacement.
9.5. Check reassembled unit for binding and correct as
necessary.
9.6. Be sure to tighten motor adapter bolts and casing bolts in
a criss-cross manner to prevent o-ring binding and
cracking of the casing ears.
10. Trouble Shooting Chart
MOTOR NOT RUNNING (See causes 1 through 6)
LITTLE OR NO LIQUID DELIVERED
(See causes 7 through 17)
POWER CONSUMPTION TOO HIGH
(See causes 4, 17, 18, 19, 22)
EXCESSIVE NOISE AND VIBRATION
(See causes 4, 6, 9, 13, 15, 16, 18, 20, 21, 22)
PROBABLE CAUSE:
1. Tripped thermal protector
2. Open circuit breaker
3. Blown fuse
4. Rotating parts binding
5. Motor wired improperly
6. Defective motor
7. Not primed
8. Discharge plugged or valve closed
9. Incorrect rotation
10. Foot valve too small, suction not submerged,
inlet screen plugged.
11. Low voltage
12. Phase loss (3-phase only)
13. Air or gasses in liquid
14. System head too high
15. NPSHA too low: Suction lift too high or suction
losses excessive. Check with vacuum gauge.
16. Impeller worn or plugged
17. Incorrect impeller diameter
18. Head too low, causing excessive flow rate
19. Viscosity or specific gravity too high
20. Worn bearings
21. Pump or piping loose
22. Pump and motor misaligned
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