Reassembly; Troubleshooting - Xylem Goulds LB Manual De Instruccion

NOTE: Further disassembly will require
removal of the mechanical seal. It is recom-
mended that a new mechanical seal be installed
at reassembly.
8.2.6 Lubricate the shaft and mechanical seal with
soapy water.
8.2.7 Remove rotary portion of the mechanical seal
(10).
8.2.8 Remove motor adapter screws (15) and motor
adapter (13) from motor.
8.2.9 Remove stationary portion of mechanical seal
(11) from motor adapter (13).

9. REASSEMBLY

9.1 Clean all parts before reassembly.
9.2 Recommend replacement of o-rings (5, 7, 12) and
mechanical seal (10, 11) if removed during disassem-
bly procedure.
9.3 Inspect and replace nozzle/venturi assembly (6) if any
surface deterioration is noticed in the nozzle area.
9.4 Reassembly is the reverse of disassembly. Observe the
following when reassembling the pump.
9.5 Lubricate o-rings and mechanical seal with soapy
water to ease assembly.
9.6 Tighten casing screws (3) to 10 ft.-lb. of torque using
a star pattern to prevent o-ring binding.

TROUBLESHOOTING

SYMPTOM
MOTOR NOT RUNNING
See Probable Causes 1 thru 6
LITTLE OR NO LIQUID DELIVERED
See Probable Causes 7 thru 17
POWER CONSUMPTION TOO HIGH
See Probable Causes 4, 17, 18, 19, 22
EXCESSIVE NOISE AND VIBRATION
See Probable Causes 4, 6, 9, 13, 15, 16, 18, 20, 21, 22
PROBABLE CAUSES
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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