Reassembly; Troubleshooting; Motor Not Running - Xylem GOULDS MCC Manuel D'utilisation

the two parts. The mechanical seal rotary unit
(383) should come off the shaft with the seal
housing.
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. Re-
placement of complete seal assembly, when-
ever seal has been removed, is good standard
practice. It is permissible to use a light lubri-
cant, 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. TROUBLESHOOTING 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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