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PROBLEM
1a
1b
1.MOTOR DOES
1c
NOT START
1d
1e
1f
2a
2. PUMP BLOCKED
2b
2c
3a
3. THE PUMP
FUNCTIONS BUT
NO WATER
3b
COMES OUT
3c
4a
4b
4c
4d
4. INSUFFICIENT
FLOW
4e
4f
4g
4h
5a
5b
5c
5. NOISE AND
5d
VIBRATIONS
FROM THE PUMP
5e
5f
5g
6a
6. LEAKAGE FROM
6b
THE MECHANICAL
SEAL
6c
6d
PD WATER SYSTEMS - 3000 W. 16 Ave. Miami, FL 33012. TEL: (954) 474 9090 FAX: (954) 889 0413
www.pdwatersystems.com |
POSSIBLE CAUSE
Unsuitable power supply
Incorrect electrical connections
Engine overload protective device cuts in.
Blown or defective fuses
Shaft blocked
If the above causes have already been
checked, the engine may be malfunctioning
Prolonged periods of inactivity with formation
of rust inside the pump
Presence of solid bodies in the pump rotor
Bearings siezed
Possible infiltration of air from suction tube
connections, drain plugs or filling of pump
or from the gaskets of the suction pipe
Foot valve blocked or suction pipe not
fully immersed in liquid
Suction filter blocked
Pipes and accessories with diameter too
small causing excessive loss of head
Presence of deposits or solid bodies in the
internal passages of the rotor
Rotor deteriorated
Worn rotor and pump case
Excessive viscosity of the liquid pumped
(if other than water)
Incorrect direction of rotation
Suction head excessive in relation to the
suction capacity of pump
Suction pipe too long
Rotating part unbalanced
Worn bearings
Pump and pipes not firmly attached
Flow too strong for the diameter of the
delivery pipe
Functioning in cavitation
Unbalanced power supply
Incorrect alignment of pump-motor unit
The mechanical seal has functioned when
dry or has stuck
Mechanical seal scored by presence of
abrasive parts in the liquid pumped
Mechanical seal unsuitable for the type
of application
Slight initial drip during filling or on first
start-up
REMEDY
Check that the mains frequency and voltage correspond to the electrical
characteristics shown on the indicator plate
Connect the power supply cable to the terminal board correctly. Check
that the thermal overload protection is set correctly (see data on the
engine indicator plate) and make sure that the fuseboard upline of the
engine has been properly connected
Check the power supply and make sure that the pump shaft is turning
freely. Check that the thermal overload protection has been set
correctly (see engine indicator plate)
Replace the fuses, check the electric power supply and points a) and c)
Remove the cause of blockage as indicated in the "Blocked pump"
instruction booklet
Repair or replace the engine by applying to an authorized service centre
Rotation may be started directly from the pump shaft or from the
joint (remember to turn off the electricity supply first ) or contact an
authorized service centre
If possible, dismantle the pump casing and remove any solid foreign
bodies inside the rotor, if necessary contact an authorized service
centre
If the bearings are damaged replace them or if necessary contact an
authorized service centre
Check which part is not tight and seal the connection adequately
Clean or replace the bottom valve and use a suction pipe suitable for
the application
Clean the filter, if necessary, replace it . See point 2a) also.
Use pipes and accessories suitable for the specific application
Clean the rotor and install a suction filter to prevent other foreign
bodies from entering
Replace the rotor, if necessary, contact an authorised service centre
Replace the rotor and the pump casing
The pump is unsuitable
Invert the electrical connections on the terminal board or control panel
Try to close the feeder gate partially and/or reduce the difference in
level of the pump and the liquid being aspirated
Bring the pump closer to the suction tank so as to use a shorter pipe.
If necessary use a pipe of a wider diameter
Check that no solid bodies are obstructing the rotor
Replace the bearings
Anchor the delivery and suction piping as needed
Use bigger diameters or reduce the pump flow
Reduce the flow by adjusting the feeder gate and/or using pipes with
a bigger internal diameter. See point 4g) too
Check that the mains voltage is right
If necessary, the unit must be re-aligned
Make sure that the pump casing (and the suction pipe if the pump is
not self-priming) are full of liquid and that all the air has been expelled.
See point 5 e) too.
Install a suction filter and use a seal suited to the characteristics of the
liquid being pumped.
Choose a seal with characteristics suitable for the specific application
Wait for the seal to adjust to the rotation of the shaft. If the problem per-
sists, see points 6a), 6b) or 6c) or contact an authorized service centre.
In cases 6a), 6b) and 6c), replace the seal, if necessary contact an
authorized service centre
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