Troubleshooting - Franklin Electric STANDARD CENTRIFUGAL Series Owner's Manual

3. Stack no other items on top of the pump or equipment.
4. Protect unit from the entry of any animals.
5. Periodically rotate shaft to lubricate bearings and pro-
tect bearings from brinelling.
6. Protect unit with approved drying agents.
7. Ensure all bare metal areas are coated with a rust
preventive.
8. Inspect unit every four (4) weeks and replace drying

TROUBLESHOOTING

Symptom
No Discharge
Reduced Capacity
Reduces Pressure
Loss of Prime
Power consumption excessive,
driver runs hot
Vibration and noise
Seal: excessive leakage, short life,
seal housing overheating
Bearings: over heating, short life, noise
Pump overheating, seizes
Corrosion, erosion, pitting,
oxidation or other loss of material
1
Pump not primed
2
Suction line not fi lled
3
Air pocket in suction line
4
Suction inlet or foot valve obstructed, insuffi ciently
submerged, or too small
5
System head higher than pump design head
6
System head lower than pump design head
7
Insuffi cient NPSH
8
Parallel pump application is incorrect
9
Suction pressure to vapor pressure below minimum
10 Suction lift too high
11 Excess vapor in pumpage
Specifi c gravity of pumpage different than design
12
Viscosity of pumpage different than design
13
14 Operation at below rated capacity
Cavitation
15
Electrolysis
16
17 Impeller obstructed with foreign material
Rotation direction wrong
18
Low speed
19
20 Air leak into suction line
Air leak through mechanical seal
21
22 Seal fl uid contaminated, hot or insuffi cient
Seal fl uid system not vented
23
24 High speed
agents (silica gel) or as required every six (6) months.
9. Keep inspection record showing dates of inspection
with any maintenance preformed and condition of drying
agents.
10. Before installation ensure that all rust protection has
been removed. Also, remove any foreign material that
may have accumulated during storage.
11. Before installation, remove all drying agents (silica gel).
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5 7 8
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2 3 4 7
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6
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2 4 9
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30
1 8 9
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7 8
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Possible Causes
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35 36 37 38 41 42 43 44
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36 41 42 43 44
35
Mechanical seal insuffi cient
Bearing housing excessively cooled
Low oil pressure (oil lube bearings)
Improper or poor lubrication
Lubrication defective
Dirt in lubrication/bearings
Moisture in lubricant/bearing housing
Lubricant excess
Pipe strain
Temperature growth
Misalignment
Coupling improperly installed
Impeller installed backwards
Worn wear rings
Impeller damage
Improper balance (after repair)
Bent shaft
Excessive thrust
Rotational element dragging
Worn or incorrectly installed bearings
Mechanical seal not properly set, O-rings damaged
or hardened
Shaft scored at seal
Volute O-ring
Foundation not rigid or settled
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35 36