Reassembly; Troubleshooting Chart - Xylem Goulds NPE Instrucciones De Instalación, Operación Y Mantenimiento

10. REASSEMBLY:

10.1. All parts should be cleaned before assembly.
10.2. Refer to parts list to identify required replacement
items. Specify pump index or catalog number when
ordering parts.
10.3. Reassembly is the reverse of disassembly.
10.3.1. Impeller and impeller locknut assembled
onto motor shaft with 10 ft-lbs of torque.
10.4. Observe the following when reassembling the bear-
ing frame.
10.4.1. Replace lip seals if worn or damaged.
10.4.2. Replace ball bearings if loose, rough or noisy
when rotated.
10.4.3. Check shaft for runout. Maximum permis-
sible is .002" T.I.R.
10.5. Observe the following when reassembling the
liquid-end.
10.5.1. 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.
10.5.2. Inspect casing O-ring (513) and replace if
damaged. This O-ring may be lubricated
with petroleum jelly to ease assembly.
10.5.3. Inspect guidevane O-ring (349) and replace
if worn.
Do not lubricate guidevane O-ring (349).
CAUTION
Insure it is not pinched by the impeller on
reassembly.
10.6. Check reassembled unit for binding. Correct as
required.
10.7. Tighten casing bolts in a star pattern to prevent O-
ring binding.
6
11. TROUBLE SHOOTING CHART:
MOTOR NOT RUNNING:
(See causes 1 thru 6)
LITTLE OR NO LIQUID DELIVERED:
(See causes 7 thru 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