
TECHNICAL INSTRUCTIONS
4853989
10/ 2003
Our policy is one of continuous improvement and we reserve the right to alter specifications of our products at any time.
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TABLE 1
FAULT FINDING CHART (for Electric Motor driven sets)
POTENTIAL FAULT OR DEFECT
No liquid delivered
Insufficient liquid delivered
Liquid delivered at low pressure
Loss of liquid after starting
Excessive vibration
Motor runs hot
Excessive noise from pump cavitation
Bearings or stuffing gland overheats
PROBABLE CAUSES
REMEDIAL ACTION
(See Table 2)
Pump not primed
1
Speed too low
2
Speed too high
3
Air leak on suction
4
Air or gas in liquid
5
Discharge head too high (above rating)
6
Suction lift too high
7
Not enough suction head for hot liquid
8
Inlet pipe not sufficiently submerged
Liquid viscosity greater than rating
9
Liquid density greater than rating
10
Insufficient net inlet head
11
Impeller plugged up
12
Wrong direction of rotation
13
Excessive wear ring clearance
14
Damaged impeller
15
Rotor binding
16
Defect in motor
17
Voltage/frequency lower than rating
18
Lub. oil dirty or contaminated
19
Foundation not rigid
20
Misalignment of pump/driver
21
Bearing worn
22
Rotor out of balance
23
Bent or damaged pump shaft
24
Impeller undersize
25
Air leak in stuffing box
26
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