Goulds Pumps 3996 Installation, Operation And Maintenance Instructions page 50

13 Impeller clearance too great.
14 Impeller damaged.
15 Rotating parts bind.
16 Shaft bent.
17 Coupling or pump and driver misaligned
18 Impeller diameter too small
19 Improper pressure gauge location
20 Casing gasket damaged
21 Speed too high
22 Head lower than rating; pumps too much liquid
23 Liquid heavier than anticipated
Stuffing box not properly packed (insufficient packing,
24
not properly inserted or run in, packing too tight)
25 Incorrect packing or mechanical seal
26 Damaged mechanical seal
27 Shaft sleeve scored
28 Cavitation
29 Pump capacity too low
30 Excessive vibration
31 Improper bearing lubrication or bearings worn out
46
Check for proper clearance.
Inspect and replace as required.
Check internal wearing parts for proper clearance.
Straighten or replace as required.
Check alignment and realign if required.
Consult factory for proper impeller diameter.
Check correct position and discharge nozzle or pipe.
Check gaskets and replace as required.
Check motor winding voltage or steam pressure received
by turbine.
Consult factory. Install throttle valve, cut impeller.
Check specific gravity and viscosity.
Check packing and repack stuffing box.
Consult factory.
Inspect and replace as required. Consult factory.
Remachine or replace as required.
Increase NPSH available. Consult factory.
Consult factory for minimum continuous flow.
See Preventive Maintenance / Vibration.
Inspect and replace as required.
3996 IOM 9/2010