Xylem IM052 R04 Model MCS - Manual (Page 5)

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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 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.
9.4.3. Inspect guidevane seal ring (349) and replace
if worn.
Do not lubricate guidevane seal ring
(349). Insure it is not pinched by the
impeller on reassembly.
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
CAUTION