PB3 User Instruction
Page 37 of 39
Pump overheats and seizes
Bearings have short life
Pump vibrates or is noisy
Mechanical seal has short life
Mechanical seal leaks excessively
Pump requires excessive power
Pump loses prime after starting
Insufficient pressure developed
Insufficient capacity delivered
Pump does not deliver liquid
Cause
Remedy
x
x
x
x
x
Shaft bent (excessive run out)
Check shaft run outs are within acceptable values.
CONSULT PUMPIRAN.
x
x
x
x
Rotating
part
rubbing
on
stationary part internally
Check and CONSULT PUMPIRAN, if necessary
x
x
x
x
x
Bearings worn
Replace bearings
x
x
x
Wearing ring surfaces worn
Replace worn wear ring/ surfaces
x
x
x
Impeller damaged or eroded
Replace or CONSULT PUMPIRAN for improved
material selection
x
Leakage under sleeve due to joint
failure
Replace joint and check for damage
x
x
Shaft sleeve worn or scored or
running off center
Check and replace defective parts
x
x
x
Mechanical
seal
improperly
installed
Check alignment of faces or damaged parts and
assembly method used. Refer to mechanical seal
instructions
x
x
x
x
x
Shaft running off center because
of worn bearings or misalignment
Check misalignment and correct if necessary. If
alignment
satisfactory
check
bearings
for
excessive wear
x
x
x
x
x
Impeller out of balance resulting
in vibration
Check and CONSULT PUMPIRAN
x
x
x
Abrasive solids in liquid pumped
x
x
Mechanical seal was run dry
Check mechanical seal condition and source of dry
running and repair
x
x
x
Excessive thrust caused by a
mechanical failure inside the
pump
Check wear condition of Impeller, its clearances
and liquid passages
x
x
Lack of lubrication for bearings
Check hours run since last change of lubricant.
Check oil level and add if necessary
x
x
Improper installation of bearings
(damage
during
assembly,
incorrect assembly, wrong type
of bearing etc.)
Check method of assembly, possible damage or
state of cleanliness during assembly and type of
bearing used.
Remedy or CONSULT PUMPIRAN, if necessary
x
x
Damaged
bearings
due
to
contamination
Check contamination source and replace damaged
bearings
x
x
x
x
x
Rotating assembly out of balance
Check balance, run outs, balance as required
CONSULT PUMPIRAN
x
x
x
x
x
Coupling out of balance
Check for missing parts or damage. CONSULT
PUMPIRAN
x
Cavitation
Check pump is primed check for obstruction in
suction line
C. ELECTRICAL TROUBLES
x
x
x
x
Wrong direction of rotation
Reverse 2 phases on motor terminal box
x
x
Motor running on 2 phases only
Check supply and fuses
x
x
x
Motor running too slow
Check motor terminal box connections and voltage
