Table of Contents
Advertisement
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 over-
heating
Bearings: overheating, short life, noise
Pump overheating, seizes
Corrosion, erosion, pitting, oxidation or other loss of
material
Pump not primed
1.
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 Wet-Prime 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
2,3,4,7,10,11,20,21,22,23,48,49,50
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
22,23,33,34,35,36,41,44,45,46
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.
Bearing housing excessively
cooled
26.
Low oil pressure (oil lube bear-
ings)
27.
Improper or poor lubrication
28.
Lubrication defective
29.
Dirt in lubrication/bearings
30.
Moisture in lubricant/bearing
housing
31.
Lubricant excess
32.
Pipe strain
Troubleshooting
Possible Cause
33.
Temperature growth
34.
Misalignment
35.
Coupling improperly installed
36.
Impeller installed backwards
37.
Worn wear rings
38.
Impeller damage
39.
Improper balance (after repair)
40.
Bent shaft
41.
Excessive thrust
42.
Rotational element dragging
43.
Worn or incorrectly installed
bearings
44.
Mechanical seal not properly
set, O-rings damaged or
hardened
45.
Shaft scored at seal
46.
Volute O-ring
47.
Foundation not rigid or settled
Pump casing empty or not
48.
full enough
Liquid overheating
49.
Discharge pipe under pres-
50.
sure
53
Advertisement
Table of Contents
Troubleshooting
