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Section 5 Troubleshooting
Pump Troubleshooting Guide
Symptom
No discharge
Reduced capacity
Reduced pressure
Loss of prime
Power consumption excessive, engine runs hot
Vibration and noise
Seal: excessive leakage, short life, seal housing
overheating
Bearings: overheating, short life, noise
Pump overheating, seizes
Corrosion, erosion, pitting, oxidation or other loss of
material
1.
Pump not primed
2.
Suction line not filled
3.
Air pocket in suction line
4.
Suction inlet or foot valve obstructed,
insufficiently submerged, or too small
5.
System head higher than pump
design head
6.
System head lower than pump
design head
7.
Insufficient Net Positive Suction
Head (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
12.
Specific gravity of pumpage housing
different than design
13.
Viscosity of pumpage different than
design
14.
Operation at below rated capacity
15.
Cavitation
Owner's Manual for Dry-Prime Diesel Trash Pumps
1,2,3,4,5,7,8,9,10,17,18,19,20,37
2,3,4,5,7,8,9,10,11,17,19,20,21,38,39,40,47
5,7,8,11,13,18,19,38,39,40,47
2,3,4,7,10,11,20,21,22,23
6,12,13,17,18,19,24,33,34,35,36,37,38,41,42,43,44
2,4,9,10,14,15,17,26,27,28,29,30,31,32,33,34,35,36,
39,40,41,42,43,44,48
22,23,25,33,34,35,36,41,44,45,46
26,27,28,29,30,31,32,33,34,35,36,41,42,43,44
1,8,9,14,33,34,35,36,41,42,43,44
7,8,11,14,15,16
16.
Electrolysis
17.
Impeller obstructed
18.
Rotation direction wrong
19.
Low speed
20.
Air leak into suction line
21.
Air leak through mechanical seal
22.
Seal fluid contaminated, hot or
insufficient
23.
Seal fluid system not vented
24.
High speed
25.
Mechanical seal insufficient
26.
Bearing housing excessively
cooled
27.
Low oil pressure (oil lube bear-
ings)
28.
Improper or poor lubrication
29.
Lubrication defective
30.
Dirt in lubrication/bearings
31.
Moisture in lubricant/bearing
housing
32.
Lubricant excess
Troubleshooting
Possible Cause
33.
Pipe strain
34.
Temperature growth
35.
Misalignment
36.
Coupling improperly installed
37.
Impeller installed backwards
38.
Worn wear rings
39.
Impeller damage
40.
Improper balance (after repair)
41.
Bent shaft
42.
Excessive thrust
43.
Rotational element dragging
44.
Worn or incorrectly installed
bearings
45.
Mechanical seal not properly
set, O-rings damaged or
hardened
46.
Shaft scored at seal
47.
Volute O-ring
48.
Foundation not rigid or settled
59
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Table of Contents
Troubleshooting
