Troubleshooting Chart - ITT Goulds Pumps MCC Instrucciones De Instalación, Operación Y Mantenimiento

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 to 4 wraps of Teflon tape to seal threaded connections.
5. Rotation
5.1. Correct rotation is right-hand (clockwise when viewed from
the motor end). Switch power on and off quickly. Observe
shaft rotation. To change rotation:
5.1.1. Single-phase motor: Non-reversible
5.1.2. Three-phase motor: Interchange any two power supply
leads.
6. Operation
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.
6.1. Before starting, pump must be primed (free of air and suction
pipe full of liquid) and discharge valve partially open.
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.
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 Remove motor hold-down bolts.
8.4. Disassembly of Liquid End
8.4.1. Remove casing bolts (370).
8.4.2. Remove back pull-out assembly from casing (100).
8.4.3. Remove impeller locknut (304).
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.
8.4.4. Remove impeller (101) by turning counter-clockwise
when looking at the front of the pump. Protect hand with
rag or glove.
Failure to remove the impeller in a counter-clockwise direction may
damage threading on the impeller, shaft or both.
8.4.5. With two pry bars 180 degrees apart and inserted
between the seal housing (184) and the motor adapter
(108), carefully separate the two parts. The mechanical
seal rotary unit (383) should come off the shaft with the
seal housing.
CAUTION
CAUTION
CAUTION
8.4.6. Push out the mechanical seal stationary seat from
the motor side of the seal housing.
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 casing O-ring (513) and replace if damaged.
This O-ring may be lubricated with petroleum jelly
to ease assembly.
9.5. Check reassembled unit for binding. Correct as required.
9.6. Tighten casing bolts in a star pattern to prevent O-ring
binding.
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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